Rtabmap.cpp

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/*
Copyright (c) 2010-2016, Mathieu Labbe - IntRoLab - Universite de Sherbrooke
All rights reserved.
 
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright
      notice, this list of conditions and the following disclaimer in the
      documentation and/or other materials provided with the distribution.
    * Neither the name of the Universite de Sherbrooke nor the
      names of its contributors may be used to endorse or promote products
      derived from this software without specific prior written permission.
 
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
 
#include "rtabmap/core/Rtabmap.h"
#include "rtabmap/core/Version.h"
#include "rtabmap/core/Features2d.h"
#include "rtabmap/core/Optimizer.h"
#include "rtabmap/core/Graph.h"
#include "rtabmap/core/Signature.h"
 
#include "rtabmap/core/EpipolarGeometry.h"
 
#include "rtabmap/core/util3d.h"
#include "rtabmap/core/util3d_transforms.h"
#include "rtabmap/core/util3d_filtering.h"
#include "rtabmap/core/util3d_surface.h"
 
#include "rtabmap/core/DBDriver.h"
#include "rtabmap/core/Memory.h"
#include "rtabmap/core/VWDictionary.h"
#include "rtabmap/core/BayesFilter.h"
#include "rtabmap/core/Compression.h"
#include "rtabmap/core/Registration.h"
#include "rtabmap/core/RegistrationInfo.h"
 
#include <rtabmap/utilite/ULogger.h>
#include <rtabmap/utilite/UFile.h>
#include <rtabmap/utilite/UTimer.h>
#include <rtabmap/utilite/UConversion.h>
#include <rtabmap/utilite/UMath.h>
#include <rtabmap/utilite/UProcessInfo.h>
 
#ifdef RTABMAP_PYTHON
#include "rtabmap/core/PythonInterface.h"
#endif
 
#ifdef RTABMAP_MRPT
// Used for odometry error propagation
#include <mrpt/poses/CPose3DPDFGaussian.h>
#endif
 
#include <pcl/search/kdtree.h>
#include <pcl/filters/crop_box.h>
#include <pcl/io/pcd_io.h>
#include <pcl/common/common.h>
#include <pcl/TextureMesh.h>
 
#include <stdlib.h>
#include <set>
 
#define LOG_F "LogF.txt"
#define LOG_I "LogI.txt"
 
#define GRAPH_FILE_NAME "Graph.dot"
 
 
//
//
//
// =======================================================
// MAIN LOOP, see method "void Rtabmap::process();" below.
// =======================================================
//
//
//
 
namespace rtabmap
{
 
Rtabmap::Rtabmap() :
        _publishStats(Parameters::defaultRtabmapPublishStats()),
        _publishLastSignatureData(Parameters::defaultRtabmapPublishLastSignature()),
        _publishPdf(Parameters::defaultRtabmapPublishPdf()),
        _publishLikelihood(Parameters::defaultRtabmapPublishLikelihood()),
        _publishRAMUsage(Parameters::defaultRtabmapPublishRAMUsage()),
        _computeRMSE(Parameters::defaultRtabmapComputeRMSE()),
        _saveWMState(Parameters::defaultRtabmapSaveWMState()),
        _maxTimeAllowed(Parameters::defaultRtabmapTimeThr()), // 700 ms
        _maxMemoryAllowed(Parameters::defaultRtabmapMemoryThr()), // 0=inf
        _loopThr(Parameters::defaultRtabmapLoopThr()),
        _loopRatio(Parameters::defaultRtabmapLoopRatio()),
        _aggressiveLoopThr(Parameters::defaultRGBDAggressiveLoopThr()),
        _virtualPlaceLikelihoodRatio(Parameters::defaultRtabmapVirtualPlaceLikelihoodRatio()),
        _maxLoopClosureDistance(Parameters::defaultRGBDMaxLoopClosureDistance()),
        _verifyLoopClosureHypothesis(Parameters::defaultVhEpEnabled()),
        _maxRetrieved(Parameters::defaultRtabmapMaxRetrieved()),
        _maxLocalRetrieved(Parameters::defaultRGBDMaxLocalRetrieved()),
        _maxRepublished(Parameters::defaultRtabmapMaxRepublished()),
        _rawDataKept(Parameters::defaultMemImageKept()),
        _statisticLogsBufferedInRAM(Parameters::defaultRtabmapStatisticLogsBufferedInRAM()),
        _statisticLogged(Parameters::defaultRtabmapStatisticLogged()),
        _statisticLoggedHeaders(Parameters::defaultRtabmapStatisticLoggedHeaders()),
        _rgbdSlamMode(Parameters::defaultRGBDEnabled()),
        _rgbdLinearUpdate(Parameters::defaultRGBDLinearUpdate()),
        _rgbdAngularUpdate(Parameters::defaultRGBDAngularUpdate()),
        _rgbdLinearSpeedUpdate(Parameters::defaultRGBDLinearSpeedUpdate()),
        _rgbdAngularSpeedUpdate(Parameters::defaultRGBDAngularSpeedUpdate()),
        _newMapOdomChangeDistance(Parameters::defaultRGBDNewMapOdomChangeDistance()),
        _neighborLinkRefining(Parameters::defaultRGBDNeighborLinkRefining()),
        _proximityByTime(Parameters::defaultRGBDProximityByTime()),
        _proximityBySpace(Parameters::defaultRGBDProximityBySpace()),
        _scanMatchingIdsSavedInLinks(Parameters::defaultRGBDScanMatchingIdsSavedInLinks()),
        _loopClosureIdentityGuess(Parameters::defaultRGBDLoopClosureIdentityGuess()),
        _localRadius(Parameters::defaultRGBDLocalRadius()),
        _localImmunizationRatio(Parameters::defaultRGBDLocalImmunizationRatio()),
        _proximityMaxGraphDepth(Parameters::defaultRGBDProximityMaxGraphDepth()),
        _proximityMaxPaths(Parameters::defaultRGBDProximityMaxPaths()),
        _proximityMaxNeighbors(Parameters::defaultRGBDProximityPathMaxNeighbors()),
        _proximityFilteringRadius(Parameters::defaultRGBDProximityPathFilteringRadius()),
        _proximityRawPosesUsed(Parameters::defaultRGBDProximityPathRawPosesUsed()),
        _proximityAngle(Parameters::defaultRGBDProximityAngle()*M_PI/180.0f),
        _proximityOdomGuess(Parameters::defaultRGBDProximityOdomGuess()),
        _proximityMergedScanCovFactor(Parameters::defaultRGBDProximityMergedScanCovFactor()),
        _databasePath(""),
        _optimizeFromGraphEnd(Parameters::defaultRGBDOptimizeFromGraphEnd()),
        _optimizationMaxError(Parameters::defaultRGBDOptimizeMaxError()),
        _startNewMapOnLoopClosure(Parameters::defaultRtabmapStartNewMapOnLoopClosure()),
        _startNewMapOnGoodSignature(Parameters::defaultRtabmapStartNewMapOnGoodSignature()),
        _goalReachedRadius(Parameters::defaultRGBDGoalReachedRadius()),
        _goalsSavedInUserData(Parameters::defaultRGBDGoalsSavedInUserData()),
        _pathStuckIterations(Parameters::defaultRGBDPlanStuckIterations()),
        _pathLinearVelocity(Parameters::defaultRGBDPlanLinearVelocity()),
        _pathAngularVelocity(Parameters::defaultRGBDPlanAngularVelocity()),
        _forceOdom3doF(Parameters::defaultRGBDForceOdom3DoF()),
        _restartAtOrigin(Parameters::defaultRGBDStartAtOrigin()),
        _loopCovLimited(Parameters::defaultRGBDLoopCovLimited()),
        _loopGPS(Parameters::defaultRtabmapLoopGPS()),
        _maxOdomCacheSize(Parameters::defaultRGBDMaxOdomCacheSize()),
        _localizationSmoothing(Parameters::defaultRGBDLocalizationSmoothing()),
        _localizationPriorInf(1.0/(Parameters::defaultRGBDLocalizationPriorError()*Parameters::defaultRGBDLocalizationPriorError())),
        _createGlobalScanMap(Parameters::defaultRGBDProximityGlobalScanMap()),
        _markerPriorsLinearVariance(Parameters::defaultMarkerPriorsVarianceLinear()),
        _markerPriorsAngularVariance(Parameters::defaultMarkerPriorsVarianceAngular()),
        _loopClosureHypothesis(0,0.0f),
        _highestHypothesis(0,0.0f),
        _lastProcessTime(0.0),
        _someNodesHaveBeenTransferred(false),
        _distanceTravelled(0.0f),
        _distanceTravelledSinceLastLocalization(0.0f),
        _optimizeFromGraphEndChanged(false),
        _epipolarGeometry(0),
        _bayesFilter(0),
        _graphOptimizer(0),
        _memory(0),
        _foutFloat(0),
        _foutInt(0),
        _wDir(""),
        _mapCorrection(Transform::getIdentity()),
        _lastLocalizationNodeId(0),
        _currentSessionHasGPS(false),
        _pathStatus(0),
        _pathCurrentIndex(0),
        _pathGoalIndex(0),
        _pathTransformToGoal(Transform::getIdentity()),
        _pathStuckCount(0),
        _pathStuckDistance(0.0f)
#ifdef RTABMAP_PYTHON
        ,_python(new PythonInterface())
#endif
{
}
 
Rtabmap::~Rtabmap() {
        UDEBUG("");
        this->close();
}
 
void Rtabmap::setupLogFiles(bool overwrite)
{
        flushStatisticLogs();
        // Log files
        if(_foutFloat)
        {
                fclose(_foutFloat);
                _foutFloat = 0;
        }
        if(_foutInt)
        {
                fclose(_foutInt);
                _foutInt = 0;
        }
 
        if(_statisticLogged && !_wDir.empty())
        {
                std::string attributes = "a+"; // append to log files
                if(overwrite)
                {
                        // If a file with the same name already exists
                        // its content is erased and the file is treated
                        // as a new empty file.
                        attributes = "w";
                }
 
                bool addLogFHeader = overwrite || !UFile::exists(_wDir+"/"+LOG_F);
                bool addLogIHeader = overwrite || !UFile::exists(_wDir+"/"+LOG_I);
 
        #ifdef _MSC_VER
                fopen_s(&_foutFloat, (_wDir+"/"+LOG_F).c_str(), attributes.c_str());
                fopen_s(&_foutInt, (_wDir+"/"+LOG_I).c_str(), attributes.c_str());
        #else
                _foutFloat = fopen((_wDir+"/"+LOG_F).c_str(), attributes.c_str());
                _foutInt = fopen((_wDir+"/"+LOG_I).c_str(), attributes.c_str());
        #endif
                // add header (column identification)
                if(_statisticLoggedHeaders && addLogFHeader && _foutFloat)
                {
                        fprintf(_foutFloat, "Column headers:\n");
                        fprintf(_foutFloat, " 1-Total iteration time (s)\n");
                        fprintf(_foutFloat, " 2-Memory update time (s)\n");
                        fprintf(_foutFloat, " 3-Retrieval time (s)\n");
                        fprintf(_foutFloat, " 4-Likelihood time (s)\n");
                        fprintf(_foutFloat, " 5-Posterior time (s)\n");
                        fprintf(_foutFloat, " 6-Hypothesis selection time (s)\n");
                        fprintf(_foutFloat, " 7-Hypothesis validation time (s)\n");
                        fprintf(_foutFloat, " 8-Transfer time (s)\n");
                        fprintf(_foutFloat, " 9-Statistics creation time (s)\n");
                        fprintf(_foutFloat, " 10-Loop closure hypothesis value\n");
                        fprintf(_foutFloat, " 11-NAN\n");
                        fprintf(_foutFloat, " 12-NAN\n");
                        fprintf(_foutFloat, " 13-NAN\n");
                        fprintf(_foutFloat, " 14-NAN\n");
                        fprintf(_foutFloat, " 15-NAN\n");
                        fprintf(_foutFloat, " 16-Virtual place hypothesis\n");
                        fprintf(_foutFloat, " 17-Join trash time (s)\n");
                        fprintf(_foutFloat, " 18-Weight Update (rehearsal) similarity\n");
                        fprintf(_foutFloat, " 19-Empty trash time (s)\n");
                        fprintf(_foutFloat, " 20-Retrieval database access time (s)\n");
                        fprintf(_foutFloat, " 21-Add loop closure link time (s)\n");
                        fprintf(_foutFloat, " 22-Memory cleanup time (s)\n");
                        fprintf(_foutFloat, " 23-Scan matching (odometry correction) time (s)\n");
                        fprintf(_foutFloat, " 24-Local time loop closure detection time (s)\n");
                        fprintf(_foutFloat, " 25-Local space loop closure detection time (s)\n");
                        fprintf(_foutFloat, " 26-Map optimization (s)\n");
                }
                if(_statisticLoggedHeaders && addLogIHeader && _foutInt)
                {
                        fprintf(_foutInt, "Column headers:\n");
                        fprintf(_foutInt, " 1-Loop closure ID\n");
                        fprintf(_foutInt, " 2-Highest loop closure hypothesis\n");
                        fprintf(_foutInt, " 3-Locations transferred\n");
                        fprintf(_foutInt, " 4-NAN\n");
                        fprintf(_foutInt, " 5-Words extracted from the last image\n");
                        fprintf(_foutInt, " 6-Vocabulary size\n");
                        fprintf(_foutInt, " 7-Working memory size\n");
                        fprintf(_foutInt, " 8-Is loop closure hypothesis rejected?\n");
                        fprintf(_foutInt, " 9-NAN\n");
                        fprintf(_foutInt, " 10-NAN\n");
                        fprintf(_foutInt, " 11-Locations retrieved\n");
                        fprintf(_foutInt, " 12-Retrieval location ID\n");
                        fprintf(_foutInt, " 13-Unique words extraced from last image\n");
                        fprintf(_foutInt, " 14-Retrieval ID\n");
                        fprintf(_foutInt, " 15-Non-null likelihood values\n");
                        fprintf(_foutInt, " 16-Weight Update ID\n");
                        fprintf(_foutInt, " 17-Is last location merged through Weight Update?\n");
                        fprintf(_foutInt, " 18-Local graph size\n");
                        fprintf(_foutInt, " 19-Sensor data id\n");
                        fprintf(_foutInt, " 20-Indexed words\n");
                        fprintf(_foutInt, " 21-Index memory usage (KB)\n");
                }
 
                ULOGGER_DEBUG("Log file (int)=%s", (_wDir+"/"+LOG_I).c_str());
                ULOGGER_DEBUG("Log file (float)=%s", (_wDir+"/"+LOG_F).c_str());
        }
        else
        {
                if(_statisticLogged)
                {
                        UWARN("Working directory is not set, log disabled!");
                }
                UDEBUG("Log disabled!");
        }
}
 
void Rtabmap::flushStatisticLogs()
{
        if(_foutFloat && _bufferedLogsF.size())
        {
                UDEBUG("_bufferedLogsF.size=%d", _bufferedLogsF.size());
                for(std::list<std::string>::iterator iter = _bufferedLogsF.begin(); iter!=_bufferedLogsF.end(); ++iter)
                {
                        fprintf(_foutFloat, "%s", iter->c_str());
                }
                _bufferedLogsF.clear();
        }
        if(_foutInt && _bufferedLogsI.size())
        {
                UDEBUG("_bufferedLogsI.size=%d", _bufferedLogsI.size());
                for(std::list<std::string>::iterator iter = _bufferedLogsI.begin(); iter!=_bufferedLogsI.end(); ++iter)
                {
                        fprintf(_foutInt, "%s", iter->c_str());
                }
                _bufferedLogsI.clear();
        }
}
 
void Rtabmap::init(const ParametersMap & parameters, const std::string & databasePath, bool loadDatabaseParameters)
{
        UDEBUG("path=%s", databasePath.c_str());
        _databasePath = databasePath;
        if(!_databasePath.empty())
        {
                UASSERT(UFile::getExtension(_databasePath).compare("db") == 0);
                UINFO("Using database \"%s\".", _databasePath.c_str());
        }
        else
        {
                UWARN("Using empty database. Mapping session will not be saved unless it is closed with an output database path.");
        }
 
        bool newDatabase = _databasePath.empty() || !UFile::exists(_databasePath);
 
        ParametersMap allParameters;
        if(!newDatabase && loadDatabaseParameters)
        {
                DBDriver * driver = DBDriver::create();
                if(driver->openConnection(_databasePath, false))
                {
                        allParameters = driver->getLastParameters();
                        // ignore working directory (we may be on a different computer)
                        allParameters.erase(Parameters::kRtabmapWorkingDirectory());
                }
                delete driver;
        }
 
        uInsert(allParameters, parameters);
        ParametersMap::const_iterator iter;
        if((iter=allParameters.find(Parameters::kRtabmapWorkingDirectory())) != allParameters.end())
        {
                this->setWorkingDirectory(iter->second.c_str());
        }
 
        // If doesn't exist, create a memory
        if(!_memory)
        {
                _memory = new Memory(allParameters);
                _memory->init(_databasePath, false, allParameters, true);
        }
 
        _optimizedPoses.clear();
        _constraints.clear();
        _globalScanMap.clear();
        _globalScanMapPoses.clear();
        _odomCachePoses.clear();
        _odomCacheConstraints.clear();
        _nodesToRepublish.clear();
 
        // Parse all parameters
        this->parseParameters(allParameters);
 
        Transform lastPose;
        _optimizedPoses = _memory->loadOptimizedPoses(&lastPose);
        if(!_memory->isIncremental())
        {
                if(_optimizedPoses.empty() &&
                        _memory->getWorkingMem().size()>1 &&
                        _memory->getWorkingMem().lower_bound(1)!=_memory->getWorkingMem().end())
                {
                        cv::Mat cov;
                        this->optimizeCurrentMap(
                                        !_optimizeFromGraphEnd?_memory->getWorkingMem().lower_bound(1)->first:_memory->getWorkingMem().rbegin()->first,
                                        false, _optimizedPoses, cov, &_constraints);
                }
                if(!_optimizedPoses.empty())
                {
                        if(_restartAtOrigin)
                        {
                                UWARN("last localization pose is ignored (%s=true), assuming we start at the origin of the map.", Parameters::kRGBDStartAtOrigin().c_str());
                                lastPose = _optimizedPoses.begin()->second;
                        }
                        _lastLocalizationPose = lastPose;
 
                        UINFO("Loaded optimizedPoses=%d firstPose %d=%s lastLocalizationPose=%s",
                                        _optimizedPoses.size(),
                                        _optimizedPoses.begin()->first,
                                        _optimizedPoses.begin()->second.prettyPrint().c_str(),
                                        _lastLocalizationPose.prettyPrint().c_str());
 
                        if(_constraints.empty())
                        {
                                std::map<int, Transform> tmp;
                                // Get just the links
                                _memory->getMetricConstraints(uKeysSet(_optimizedPoses), tmp, _constraints, false, true);
                        }
 
                        // Initialize Bayes' prediction matrix
                        UTimer time;
                        std::map<int, float> likelihood;
                        likelihood.insert(std::make_pair(Memory::kIdVirtual, 1));
                        for(std::map<int, Transform>::iterator iter=_optimizedPoses.begin(); iter!=_optimizedPoses.end(); ++iter)
                        {
                                if(_memory->getSignature(iter->first))
                                {
                                        likelihood.insert(std::make_pair(iter->first, 0));
                                }
                        }
                        _bayesFilter->computePosterior(_memory, likelihood);
                        UINFO("Time initializing Bayes' prediction with %ld nodes: %fs", _optimizedPoses.size(), time.ticks());
 
                        if(_createGlobalScanMap)
                                createGlobalScanMap();
                }
                else
                {
                        UINFO("Loaded optimizedPoses=0, last localization pose is ignored!");
                }
        }
        else
        {
                _lastLocalizationPose = lastPose;
                if(!_optimizedPoses.empty())
                {
                        std::map<int, Transform> tmp;
                        // Get just the links
                        _memory->getMetricConstraints(uKeysSet(_optimizedPoses), tmp, _constraints, false, true);
                }
        }
 
        if(_databasePath.empty())
        {
                _statisticLogged = false;
        }
        setupLogFiles(newDatabase);
}
 
void Rtabmap::init(const std::string & configFile, const std::string & databasePath, bool loadDatabaseParameters)
{
        // fill ctrl struct with values from the configuration file
        ParametersMap param;// = Parameters::defaultParameters;
 
        if(!configFile.empty())
        {
                ULOGGER_DEBUG("Read parameters from = %s", configFile.c_str());
                Parameters::readINI(configFile, param);
        }
 
        this->init(param, databasePath, loadDatabaseParameters);
}
 
void Rtabmap::close(bool databaseSaved, const std::string & ouputDatabasePath)
{
        UINFO("databaseSaved=%d", databaseSaved?1:0);
        _highestHypothesis = std::make_pair(0,0.0f);
        _loopClosureHypothesis = std::make_pair(0,0.0f);
        _lastProcessTime = 0.0;
        _someNodesHaveBeenTransferred = false;
        _constraints.clear();
        _mapCorrection.setIdentity();
        _mapCorrectionBackup.setNull();
 
        _localizationCovariance = cv::Mat();
        _lastLocalizationNodeId = 0;
        _odomCachePoses.clear();
        _odomCacheConstraints.clear();
        _distanceTravelled = 0.0f;
        _distanceTravelledSinceLastLocalization = 0.0f;
        _optimizeFromGraphEndChanged = false;
        this->clearPath(0);
        _gpsGeocentricCache.clear();
        _currentSessionHasGPS = false;
 
        _globalScanMap.clear();
        _globalScanMapPoses.clear();
 
        _nodesToRepublish.clear();
 
        flushStatisticLogs();
        if(_foutFloat)
        {
                fclose(_foutFloat);
                _foutFloat = 0;
        }
        if(_foutInt)
        {
                fclose(_foutInt);
                _foutInt = 0;
        }
 
        if(_epipolarGeometry)
        {
                delete _epipolarGeometry;
                _epipolarGeometry = 0;
        }
        if(_memory)
        {
                if(databaseSaved)
                {
                        if(_memory->isGraphReduced() && _memory->isIncremental())
                        {
                                // Force reducing graph, then remove filtered nodes from the optimized poses
                                std::map<int, int> reducedIds;
                                _memory->incrementMapId(&reducedIds);
                                for(std::map<int, int>::iterator iter=reducedIds.begin(); iter!=reducedIds.end(); ++iter)
                                {
                                        _optimizedPoses.erase(iter->first);
                                }
                        }
                        _memory->saveOptimizedPoses(_optimizedPoses, _lastLocalizationPose);
                }
                _memory->close(databaseSaved, true, ouputDatabasePath);
                delete _memory;
                _memory = 0;
        }
        _optimizedPoses.clear();
        _lastLocalizationPose.setNull();
 
        if(_bayesFilter)
        {
                delete _bayesFilter;
                _bayesFilter = 0;
        }
        if(_graphOptimizer)
        {
                delete _graphOptimizer;
                _graphOptimizer = 0;
        }
        _databasePath.clear();
        parseParameters(Parameters::getDefaultParameters()); // reset to default parameters
        _parameters.clear();
}
 
void Rtabmap::parseParameters(const ParametersMap & parameters)
{
        uInsert(_parameters, parameters);
 
        // place this before changing working directory
        Parameters::parse(parameters, Parameters::kRtabmapStatisticLogsBufferedInRAM(), _statisticLogsBufferedInRAM);
        Parameters::parse(parameters, Parameters::kRtabmapStatisticLogged(), _statisticLogged);
        Parameters::parse(parameters, Parameters::kRtabmapStatisticLoggedHeaders(), _statisticLoggedHeaders);
 
        ULOGGER_DEBUG("");
        ParametersMap::const_iterator iter;
        if((iter=parameters.find(Parameters::kRtabmapWorkingDirectory())) != parameters.end())
        {
                this->setWorkingDirectory(iter->second.c_str());
        }
 
        Parameters::parse(parameters, Parameters::kRtabmapPublishStats(), _publishStats);
        Parameters::parse(parameters, Parameters::kRtabmapPublishLastSignature(), _publishLastSignatureData);
        Parameters::parse(parameters, Parameters::kRtabmapPublishPdf(), _publishPdf);
        Parameters::parse(parameters, Parameters::kRtabmapPublishLikelihood(), _publishLikelihood);
        Parameters::parse(parameters, Parameters::kRtabmapPublishRAMUsage(), _publishRAMUsage);
        Parameters::parse(parameters, Parameters::kRtabmapComputeRMSE(), _computeRMSE);
        Parameters::parse(parameters, Parameters::kRtabmapSaveWMState(), _saveWMState);
        Parameters::parse(parameters, Parameters::kRtabmapTimeThr(), _maxTimeAllowed);
        Parameters::parse(parameters, Parameters::kRtabmapMemoryThr(), _maxMemoryAllowed);
        Parameters::parse(parameters, Parameters::kRtabmapLoopThr(), _loopThr);
        Parameters::parse(parameters, Parameters::kRtabmapLoopRatio(), _loopRatio);
        Parameters::parse(parameters, Parameters::kRGBDAggressiveLoopThr(), _aggressiveLoopThr);
        Parameters::parse(parameters, Parameters::kRtabmapVirtualPlaceLikelihoodRatio(), _virtualPlaceLikelihoodRatio);
 
        Parameters::parse(parameters, Parameters::kRGBDMaxLoopClosureDistance(), _maxLoopClosureDistance);
        Parameters::parse(parameters, Parameters::kVhEpEnabled(), _verifyLoopClosureHypothesis);
        Parameters::parse(parameters, Parameters::kRtabmapMaxRetrieved(), _maxRetrieved);
        Parameters::parse(parameters, Parameters::kRGBDMaxLocalRetrieved(), _maxLocalRetrieved);
        Parameters::parse(parameters, Parameters::kRtabmapMaxRepublished(), _maxRepublished);
        if(_maxRepublished == 0 || !_publishLastSignatureData)
        {
                _nodesToRepublish.clear();
        }
        Parameters::parse(parameters, Parameters::kMemImageKept(), _rawDataKept);
        Parameters::parse(parameters, Parameters::kRGBDEnabled(), _rgbdSlamMode);
        Parameters::parse(parameters, Parameters::kRGBDLinearUpdate(), _rgbdLinearUpdate);
        Parameters::parse(parameters, Parameters::kRGBDAngularUpdate(), _rgbdAngularUpdate);
        Parameters::parse(parameters, Parameters::kRGBDLinearSpeedUpdate(), _rgbdLinearSpeedUpdate);
        Parameters::parse(parameters, Parameters::kRGBDAngularSpeedUpdate(), _rgbdAngularSpeedUpdate);
        Parameters::parse(parameters, Parameters::kRGBDNewMapOdomChangeDistance(), _newMapOdomChangeDistance);
        Parameters::parse(parameters, Parameters::kRGBDNeighborLinkRefining(), _neighborLinkRefining);
        Parameters::parse(parameters, Parameters::kRGBDProximityByTime(), _proximityByTime);
        Parameters::parse(parameters, Parameters::kRGBDProximityBySpace(), _proximityBySpace);
        Parameters::parse(parameters, Parameters::kRGBDScanMatchingIdsSavedInLinks(), _scanMatchingIdsSavedInLinks);
        Parameters::parse(parameters, Parameters::kRGBDLoopClosureIdentityGuess(), _loopClosureIdentityGuess);
        Parameters::parse(parameters, Parameters::kRGBDLocalRadius(), _localRadius);
        Parameters::parse(parameters, Parameters::kRGBDLocalImmunizationRatio(), _localImmunizationRatio);
        Parameters::parse(parameters, Parameters::kRGBDProximityMaxGraphDepth(), _proximityMaxGraphDepth);
        Parameters::parse(parameters, Parameters::kRGBDProximityMaxPaths(), _proximityMaxPaths);
        Parameters::parse(parameters, Parameters::kRGBDProximityPathMaxNeighbors(), _proximityMaxNeighbors);
        Parameters::parse(parameters, Parameters::kRGBDProximityPathFilteringRadius(), _proximityFilteringRadius);
        Parameters::parse(parameters, Parameters::kRGBDProximityPathRawPosesUsed(), _proximityRawPosesUsed);
        if(Parameters::parse(parameters, Parameters::kRGBDProximityAngle(), _proximityAngle))
        {
                _proximityAngle *= M_PI/180.0f;
        }
        Parameters::parse(parameters, Parameters::kRGBDProximityOdomGuess(), _proximityOdomGuess);
        Parameters::parse(parameters, Parameters::kRGBDProximityMergedScanCovFactor(), _proximityMergedScanCovFactor);
        UASSERT(_proximityMergedScanCovFactor>0.0);
 
        bool optimizeFromGraphEndPrevious = _optimizeFromGraphEnd;
        Parameters::parse(parameters, Parameters::kRGBDOptimizeFromGraphEnd(), _optimizeFromGraphEnd);
        if(optimizeFromGraphEndPrevious != _optimizeFromGraphEnd && !_optimizedPoses.empty())
        {
                _optimizeFromGraphEndChanged = true;
        }
        Parameters::parse(parameters, Parameters::kRGBDOptimizeMaxError(), _optimizationMaxError);
        Parameters::parse(parameters, Parameters::kRtabmapStartNewMapOnLoopClosure(), _startNewMapOnLoopClosure);
        Parameters::parse(parameters, Parameters::kRtabmapStartNewMapOnGoodSignature(), _startNewMapOnGoodSignature);
        Parameters::parse(parameters, Parameters::kRGBDGoalReachedRadius(), _goalReachedRadius);
        Parameters::parse(parameters, Parameters::kRGBDGoalsSavedInUserData(), _goalsSavedInUserData);
        Parameters::parse(parameters, Parameters::kRGBDPlanStuckIterations(), _pathStuckIterations);
        Parameters::parse(parameters, Parameters::kRGBDPlanLinearVelocity(), _pathLinearVelocity);
        Parameters::parse(parameters, Parameters::kRGBDPlanAngularVelocity(), _pathAngularVelocity);
        Parameters::parse(parameters, Parameters::kRGBDForceOdom3DoF(), _forceOdom3doF);
        Parameters::parse(parameters, Parameters::kRGBDStartAtOrigin(), _restartAtOrigin);
        Parameters::parse(parameters, Parameters::kRGBDLoopCovLimited(), _loopCovLimited);
        Parameters::parse(parameters, Parameters::kRtabmapLoopGPS(), _loopGPS);
        Parameters::parse(parameters, Parameters::kRGBDMaxOdomCacheSize(), _maxOdomCacheSize);
        Parameters::parse(parameters, Parameters::kRGBDLocalizationSmoothing(), _localizationSmoothing);
        double localizationPriorError = Parameters::defaultRGBDLocalizationPriorError();
        Parameters::parse(parameters, Parameters::kRGBDLocalizationPriorError(), localizationPriorError);
        UASSERT(localizationPriorError>0.0);
        _localizationPriorInf = 1.0/(localizationPriorError*localizationPriorError);
        Parameters::parse(parameters, Parameters::kRGBDProximityGlobalScanMap(), _createGlobalScanMap);
 
        Parameters::parse(parameters, Parameters::kMarkerPriorsVarianceLinear(), _markerPriorsLinearVariance);
        UASSERT(_markerPriorsLinearVariance>0.0f);
        Parameters::parse(parameters, Parameters::kMarkerPriorsVarianceAngular(), _markerPriorsAngularVariance);
        UASSERT(_markerPriorsAngularVariance>0.0f);
        std::string markerPriorsStr;
        if(Parameters::parse(parameters, Parameters::kMarkerPriors(), markerPriorsStr))
        {
                _markerPriors.clear();
                std::list<std::string> strList = uSplit(markerPriorsStr, '|');
                for(std::list<std::string>::iterator iter=strList.begin(); iter!=strList.end(); ++iter)
                {
                        std::string markerStr = *iter;
                        while(!markerStr.empty() && !uIsDigit(markerStr[0]))
                        {
                                markerStr.erase(markerStr.begin());
                        }
                        if(!markerStr.empty())
                        {
                                std::string idStr = uSplitNumChar(markerStr).front();
                                int id = uStr2Int(idStr);
                                Transform prior = Transform::fromString(markerStr.substr(idStr.size()));
                                if(!prior.isNull() && id>0)
                                {
                                        _markerPriors.insert(std::make_pair(-id, prior));
                                        UDEBUG("Added landmark prior %d: %s", id, prior.prettyPrint().c_str());
                                }
                                else
                                {
                                        UERROR("Failed to parse element \"%s\" in parameter %s", markerStr.c_str(), Parameters::kMarkerPriors().c_str());
                                }
                        }
                        else if(!iter->empty())
                        {
                                UERROR("Failed to parse parameter %s, value=\"%s\"", Parameters::kMarkerPriors().c_str(), iter->c_str());
                        }
                }
        }
 
        UASSERT(_rgbdLinearUpdate >= 0.0f);
        UASSERT(_rgbdAngularUpdate >= 0.0f);
        UASSERT(_rgbdLinearSpeedUpdate >= 0.0f);
        UASSERT(_rgbdAngularSpeedUpdate >= 0.0f);
        UASSERT(_maxOdomCacheSize >= 0);
 
        // By default, we create our strategies if they are not already created.
        // If they already exists, we check the parameters if a change is requested
 
        // Graph optimizer
        Optimizer::Type optimizerType = Optimizer::kTypeUndef;
        if((iter=parameters.find(Parameters::kOptimizerStrategy())) != parameters.end())
        {
                optimizerType = (Optimizer::Type)std::atoi((*iter).second.c_str());
        }
        if(optimizerType!=Optimizer::kTypeUndef)
        {
                UDEBUG("new detector strategy %d", int(optimizerType));
                if(_graphOptimizer)
                {
                        delete _graphOptimizer;
                        _graphOptimizer = 0;
                }
 
                _graphOptimizer = Optimizer::create(optimizerType, _parameters);
        }
        else if(_graphOptimizer)
        {
                _graphOptimizer->parseParameters(parameters);
        }
        else
        {
                optimizerType = (Optimizer::Type)Parameters::defaultOptimizerStrategy();
                _graphOptimizer = Optimizer::create(optimizerType, parameters);
        }
 
        if(!_createGlobalScanMap)
        {
                _globalScanMap.clear();
                _globalScanMapPoses.clear();
        }
 
        if(_memory)
        {
                bool isMemIncremental = _memory->isIncremental();
                if(Parameters::parse(parameters, Parameters::kMemIncrementalMemory(), isMemIncremental) &&
                        isMemIncremental != _memory->isIncremental())
                {
                        // Mode has changed from Mapping to Localization, cleanup the local graph
                        if(_memory->isGraphReduced() && _memory->isIncremental())
                        {
                                // Force reducing graph, then remove filtered nodes from the optimized poses
                                std::map<int, int> reducedIds;
                                _memory->incrementMapId(&reducedIds);
                                for(std::map<int, int>::iterator iter=reducedIds.begin(); iter!=reducedIds.end(); ++iter)
                                {
                                        _optimizedPoses.erase(iter->first);
                                }
                        }
 
                        // In both cases, we save the latest optimized graph and latest localization pose
                        _memory->saveOptimizedPoses(_optimizedPoses, _lastLocalizationPose);
 
                        // Mode changed from Localization to Mapping, clear local graph
                        if(!_memory->isIncremental()) {
                                _optimizedPoses.clear();
                                _lastLocalizationPose.setNull();
                                _mapCorrection.setIdentity();
                                _mapCorrectionBackup.setNull();
                                _localizationCovariance = cv::Mat();
                                _lastLocalizationNodeId = 0;
                        }
                }
 
                _memory->parseParameters(parameters);
                if(_memory->isIncremental() && !_globalScanMap.empty())
                {
                        UWARN("Map is now incremental, clearing global scan map...");
                        _globalScanMap.clear();
                        _globalScanMapPoses.clear();
                }
 
                if(_createGlobalScanMap && !_memory->isIncremental() && _globalScanMap.empty() && !_optimizedPoses.empty())
                {
                        this->createGlobalScanMap();
                }
 
                if(_memory->isIncremental())
                {
                        _odomCachePoses.clear();
                        _odomCacheConstraints.clear();
                }
        }
 
        if(!_epipolarGeometry)
        {
                _epipolarGeometry = new EpipolarGeometry(_parameters);
        }
        else
        {
                _epipolarGeometry->parseParameters(parameters);
        }
 
        // Bayes filter, create one if not exists
        if(!_bayesFilter)
        {
                _bayesFilter = new BayesFilter(_parameters);
        }
        else
        {
                _bayesFilter->parseParameters(parameters);
        }
}
 
int Rtabmap::getLastLocationId() const
{
        int id = 0;
        if(_memory)
        {
                id = _memory->getLastSignatureId();
        }
        return id;
}
 
std::list<int> Rtabmap::getWM() const
{
        std::list<int> mem;
        if(_memory)
        {
                mem = uKeysList(_memory->getWorkingMem());
                mem.remove(-1);// Ignore the virtual signature (if here)
        }
        return mem;
}
 
int Rtabmap::getWMSize() const
{
        if(_memory)
        {
                return (int)_memory->getWorkingMem().size()-1; // remove virtual place
        }
        return 0;
}
 
std::map<int, int> Rtabmap::getWeights() const
{
        std::map<int, int> weights;
        if(_memory)
        {
                weights = _memory->getWeights();
                weights.erase(-1);// Ignore the virtual signature (if here)
        }
        return weights;
}
 
std::set<int> Rtabmap::getSTM() const
{
        if(_memory)
        {
                return _memory->getStMem();
        }
        return std::set<int>();
}
 
int Rtabmap::getSTMSize() const
{
        if(_memory)
        {
                return (int)_memory->getStMem().size();
        }
        return 0;
}
 
int Rtabmap::getTotalMemSize() const
{
        if(_memory)
        {
                const Signature * s  =_memory->getLastWorkingSignature();
                if(s)
                {
                        return s->id();
                }
        }
        return 0;
}
 
bool Rtabmap::isInSTM(int locationId) const
{
        if(_memory)
        {
                return _memory->isInSTM(locationId);
        }
        return false;
}
 
bool Rtabmap::isIDsGenerated() const
{
        if(_memory)
        {
                return _memory->isIDsGenerated();
        }
        return Parameters::defaultMemGenerateIds();
}
 
const Statistics & Rtabmap::getStatistics() const
{
        return statistics_;
}
 
Transform Rtabmap::getPose(int locationId) const
{
        return uValue(_optimizedPoses, locationId, Transform());
}
 
void Rtabmap::setInitialPose(const Transform & initialPose)
{
        if(_memory)
        {
                if(!_memory->isIncremental())
                {
                        _lastLocalizationPose = initialPose;
                        _localizationCovariance = cv::Mat();
                        _lastLocalizationNodeId = 0;
                        _odomCachePoses.clear();
                        _odomCacheConstraints.clear();
                        _mapCorrection.setIdentity();
                        _mapCorrectionBackup.setNull();
 
                        if(_memory->getLastWorkingSignature()->id() &&
                                _optimizedPoses.empty())
                        {
                                cv::Mat covariance;
                                this->optimizeCurrentMap(_memory->getLastWorkingSignature()->id(), false, _optimizedPoses, covariance, &_constraints);
                        }
                }
                else
                {
                        UWARN("Initial pose can only be set in localization mode (%s=false), ignoring it...", Parameters::kMemIncrementalMemory().c_str());
                }
        }
}
 
int Rtabmap::triggerNewMap()
{
        int mapId = -1;
        if(_memory)
        {
                _localizationCovariance = cv::Mat();
                _lastLocalizationNodeId = 0;
                _odomCachePoses.clear();
                _odomCacheConstraints.clear();
                _distanceTravelled = 0.0f;
                _distanceTravelledSinceLastLocalization = 0.0f;
 
                if(!_memory->isIncremental())
                {
                        _mapCorrection.setIdentity();
                        if(_restartAtOrigin)
                        {
                                _lastLocalizationPose.setIdentity();
                        }
                        return mapId;
                }
                std::map<int, int> reducedIds;
                mapId = _memory->incrementMapId(&reducedIds);
                UINFO("New map triggered, new map = %d", mapId);
                _optimizedPoses.clear();
                _constraints.clear();
 
                if(_bayesFilter)
                {
                        _bayesFilter->reset();
                }
 
                //Verify if there are nodes that were merged through graph reduction
                if(reducedIds.size() && _path.size())
                {
                        for(unsigned int i=0; i<_path.size(); ++i)
                        {
                                std::map<int, int>::const_iterator iter = reducedIds.find(_path[i].first);
                                if(iter!= reducedIds.end())
                                {
                                        // change path ID to loop closure ID
                                        _path[i].first = iter->second;
                                }
                        }
                }
        }
        return mapId;
}
 
bool Rtabmap::labelLocation(int id, const std::string & label)
{
        if(_memory)
        {
                if(id > 0)
                {
                        return _memory->labelSignature(id, label);
                }
                else if(_memory->isIncremental() && _memory->getLastWorkingSignature())
                {
                        return _memory->labelSignature(_memory->getLastWorkingSignature()->id(), label);
                }
                else if(!_memory->isIncremental() && !_lastLocalizationPose.isNull() && !_lastLocalizationPose.isIdentity())
                {
                        std::map<int, Transform> nearestNodes = getNodesInRadius(_lastLocalizationPose, _localRadius, 1);
                        if(!nearestNodes.empty())
                        {
                                return _memory->labelSignature(nearestNodes.begin()->first, label);
                        }
                        else
                        {
                                UERROR("No nodes found inside %s=%fm of the current pose (%s). Cannot set label \"%s\"",
                                                Parameters::kRGBDLocalRadius().c_str(),
                                                _localRadius,
                                                _lastLocalizationPose.prettyPrint().c_str(),
                                                label.c_str());
                        }
                }
                else
                {
                        UERROR("Last signature is null! Cannot set label \"%s\"", label.c_str());
                }
        }
        return false;
}
 
bool Rtabmap::setUserData(int id, const cv::Mat & data)
{
        if(_memory)
        {
                if(id > 0)
                {
                        return _memory->setUserData(id, data);
                }
                else if(_memory->getLastWorkingSignature())
                {
                        return _memory->setUserData(_memory->getLastWorkingSignature()->id(), data);
                }
                else
                {
                        UERROR("Last signature is null! Cannot set user data!");
                }
        }
        return false;
}
 
void Rtabmap::generateDOTGraph(const std::string & path, int id, int margin)
{
        if(_memory)
        {
                _memory->joinTrashThread(); // make sure the trash is flushed
 
                if(id > 0)
                {
                        std::map<int, int> ids = _memory->getNeighborsId(id, margin, -1, false);
 
                        if(ids.size() > 0)
                        {
                                ids.insert(std::pair<int,int>(id, 0));
                                std::set<int> idsSet;
                                for(std::map<int, int>::iterator iter = ids.begin(); iter!=ids.end(); ++iter)
                                {
                                        idsSet.insert(idsSet.end(), iter->first);
                                }
                                _memory->generateGraph(path, idsSet);
                        }
                        else
                        {
                                UERROR("No neighbors found for signature %d.", id);
                        }
                }
                else
                {
                        _memory->generateGraph(path);
                }
        }
}
 
void Rtabmap::exportPoses(const std::string & path, bool optimized, bool global, int format)
{
        if(_memory && _memory->getLastWorkingSignature())
        {
                std::map<int, Transform> poses;
                std::multimap<int, Link> constraints;
 
                if(optimized)
                {
                        cv::Mat covariance;
                        this->optimizeCurrentMap(_memory->getLastWorkingSignature()->id(), global, poses, covariance, &constraints);
                }
                else
                {
                        std::map<int, int> ids = _memory->getNeighborsId(_memory->getLastWorkingSignature()->id(), 0, global?-1:0, true);
                        _memory->getMetricConstraints(uKeysSet(ids), poses, constraints, global);
                }
 
                std::map<int, double> stamps;
                if(format == 1 || format == 10 || format == 11)
                {
                        for(std::map<int, Transform>::iterator iter=poses.begin(); iter!=poses.end(); ++iter)
                        {
                                Transform o,g;
                                int m, w;
                                std::string l;
                                double stamp = 0.0;
                                std::vector<float> v;
                                GPS gps;
                                EnvSensors sensors;
                                _memory->getNodeInfo(iter->first, o, m, w, l, stamp, g, v, gps, sensors, true);
                                stamps.insert(std::make_pair(iter->first, stamp));
                        }
                }
 
                graph::exportPoses(path, format, poses, constraints, stamps, _parameters);
        }
}
 
void Rtabmap::resetMemory()
{
        UDEBUG("");
        _highestHypothesis = std::make_pair(0,0.0f);
        _loopClosureHypothesis = std::make_pair(0,0.0f);
        _lastProcessTime = 0.0;
        _someNodesHaveBeenTransferred = false;
        _optimizedPoses.clear();
        _constraints.clear();
        _mapCorrection.setIdentity();
        _mapCorrectionBackup.setNull();
        _lastLocalizationPose.setNull();
        _localizationCovariance = cv::Mat();
        _lastLocalizationNodeId = 0;
        _odomCachePoses.clear();
        _odomCacheConstraints.clear();
        _distanceTravelled = 0.0f;
        _distanceTravelledSinceLastLocalization = 0.0f;
        _optimizeFromGraphEndChanged = false;
        _globalScanMap.clear();
        _globalScanMapPoses.clear();
        _nodesToRepublish.clear();
        this->clearPath(0);
 
        if(_memory)
        {
                _memory->init(_databasePath, true, _parameters, true);
                if(_memory->getLastWorkingSignature())
                {
                        cv::Mat covariance;
                        optimizeCurrentMap(_memory->getLastWorkingSignature()->id(), false, _optimizedPoses, covariance, &_constraints);
                }
                if(_bayesFilter)
                {
                        _bayesFilter->reset();
                }
        }
        else
        {
                UERROR("RTAB-Map is not initialized. No memory to reset...");
        }
 
        if(_graphOptimizer)
        {
                delete _graphOptimizer;
                _graphOptimizer = Optimizer::create(_parameters);
        }
 
        this->setupLogFiles(true);
}
 
class NearestPathKey
{
public:
        NearestPathKey(float l, int i, float d) :
                likelihood(l),
                id(i),
                distance(d){}
        bool operator<(const NearestPathKey & k) const
        {
                if(likelihood < k.likelihood)
                {
                        return true;
                }
                else if(likelihood == k.likelihood)
                {
                        if(distance > k.distance)
                        {
                                return true;
                        }
                        else if(distance == k.distance && id < k.id)
                        {
                                return true;
                        }
                }
                return false;
        }
        float likelihood;
        int id;
        float distance;
};
 
//============================================================
// MAIN LOOP
//============================================================
bool Rtabmap::process(
                const cv::Mat & image,
                int id,
                const std::map<std::string, float> & externalStats)
{
        return this->process(SensorData(image, id), Transform());
}
bool Rtabmap::process(
                        const SensorData & data,
                        Transform odomPose,
                        float odomLinearVariance,
                        float odomAngularVariance,
                        const std::vector<float> & odomVelocity,
                        const std::map<std::string, float> & externalStats)
{
        if(!odomPose.isNull())
        {
                UASSERT(odomLinearVariance>0.0f);
                UASSERT(odomAngularVariance>0.0f);
        }
        cv::Mat covariance = cv::Mat::eye(6,6,CV_64FC1);
        covariance.at<double>(0,0) = odomLinearVariance;
        covariance.at<double>(1,1) = odomLinearVariance;
        covariance.at<double>(2,2) = odomLinearVariance;
        covariance.at<double>(3,3) = odomAngularVariance;
        covariance.at<double>(4,4) = odomAngularVariance;
        covariance.at<double>(5,5) = odomAngularVariance;
        return process(data, odomPose, covariance, odomVelocity, externalStats);
}
bool Rtabmap::process(
                const SensorData & data,
                Transform odomPose,
                const cv::Mat & odomCovariance,
                const std::vector<float> & odomVelocity,
                const std::map<std::string, float> & externalStats)
{
        UDEBUG("");
 
        //============================================================
        // Initialization
        //============================================================
        UTimer timer;
        UTimer timerTotal;
        double timeMemoryUpdate = 0;
        double timeNeighborLinkRefining = 0;
        double timeProximityByTimeDetection = 0;
        double timeProximityBySpaceSearch = 0;
        double timeProximityBySpaceVisualDetection = 0;
        double timeProximityBySpaceDetection = 0;
        double timeCleaningNeighbors = 0;
        double timeReactivations = 0;
        double timeAddLoopClosureLink = 0;
        double timeMapOptimization = 0;
        double timeRetrievalDbAccess = 0;
        double timeLikelihoodCalculation = 0;
        double timePosteriorCalculation = 0;
        double timeHypothesesCreation = 0;
        double timeHypothesesValidation = 0;
        double timeRealTimeLimitReachedProcess = 0;
        double timeMemoryCleanup = 0;
        double timeEmptyingTrash = 0;
        double timeFinalizingStatistics = 0;
        double timeJoiningTrash = 0;
        double timeStatsCreation = 0;
 
        float hypothesisRatio = 0.0f; // Only used for statistics
        bool rejectedGlobalLoopClosure = false;
 
        std::map<int, float> rawLikelihood;
        std::map<int, float> adjustedLikelihood;
        std::map<int, float> likelihood;
        std::map<int, int> weights;
        std::map<int, float> posterior;
        std::list<std::pair<int, float> > reactivateHypotheses;
 
        std::map<int, int> childCount;
        std::set<int> signaturesRetrieved;
        int proximityDetectionsInTimeFound = 0;
 
        const Signature * signature = 0;
        const Signature * sLoop = 0;
 
        _loopClosureHypothesis = std::make_pair(0,0.0f);
        std::pair<int, float> lastHighestHypothesis = _highestHypothesis;
        _highestHypothesis = std::make_pair(0,0.0f);
 
        std::set<int> immunizedLocations;
 
        statistics_ = Statistics(); // reset
        for(std::map<std::string, float>::const_iterator iter=externalStats.begin(); iter!=externalStats.end(); ++iter)
        {
                statistics_.addStatistic(iter->first, iter->second);
        }
 
        //============================================================
        // Wait for an image...
        //============================================================
        ULOGGER_INFO("getting data...");
 
        timer.start();
        timerTotal.start();
 
        UASSERT_MSG(_memory, "RTAB-Map is not initialized!");
        UASSERT_MSG(_bayesFilter, "RTAB-Map is not initialized!");
        UASSERT_MSG(_graphOptimizer, "RTAB-Map is not initialized!");
 
        //============================================================
        // If RGBD SLAM is enabled, a pose must be set.
        //============================================================
        bool fakeOdom = false;
        if(_rgbdSlamMode)
        {
                if(!odomPose.isNull())
                {
                        // If we are doing 2D mapping, make sure the pose is 3DoF so that landmark logic works.
                        if(_forceOdom3doF && _graphOptimizer->isSlam2d() && !odomPose.is3DoF())
                        {
                                odomPose = odomPose.to3DoF();
                        }
 
                        // this will make sure that all inverse operations will work!
                        if(!odomPose.isInvertible())
                        {
                                UWARN("Input odometry is not invertible! pose = %s\n"
                                                "[%f %f %f %f;\n"
                                                " %f %f %f %f;\n"
                                                " %f %f %f %f;\n"
                                                " 0 0 0 1]\n"
                                                "Trying to normalize rotation to see if it makes it invertible...",
                                                odomPose.prettyPrint().c_str(),
                                                odomPose.r11(), odomPose.r12(), odomPose.r13(), odomPose.o14(),
                                                odomPose.r21(), odomPose.r22(), odomPose.r23(), odomPose.o24(),
                                                odomPose.r31(), odomPose.r32(), odomPose.r33(), odomPose.o34());
                                odomPose.normalizeRotation();
                                UASSERT_MSG(odomPose.isInvertible(), uFormat("Odometry pose is not invertible!\n"
                                                "[%f %f %f %f;\n"
                                                " %f %f %f %f;\n"
                                                " %f %f %f %f;\n"
                                                " 0 0 0 1]", odomPose.prettyPrint().c_str(),
                                                odomPose.r11(), odomPose.r12(), odomPose.r13(), odomPose.o14(),
                                                odomPose.r21(), odomPose.r22(), odomPose.r23(), odomPose.o24(),
                                                odomPose.r31(), odomPose.r32(), odomPose.r33(), odomPose.o34()).c_str());
                                UWARN("Normalizing rotation succeeded! fixed pose = %s\n"
                                                "[%f %f %f %f;\n"
                                                " %f %f %f %f;\n"
                                                " %f %f %f %f;\n"
                                                " 0 0 0 1]\n"
                                                "If the resulting rotation is very different from original one, try to fix the odometry or TF.",
                                                odomPose.prettyPrint().c_str(),
                                                odomPose.r11(), odomPose.r12(), odomPose.r13(), odomPose.o14(),
                                                odomPose.r21(), odomPose.r22(), odomPose.r23(), odomPose.o24(),
                                                odomPose.r31(), odomPose.r32(), odomPose.r33(), odomPose.o34());
                        }
                }
 
                UDEBUG("incremental=%d odomPose=%s optimizedPoses=%d mapCorrection=%s lastLocalizationPose=%s lastLocalizationNodeId=%d",
                                _memory->isIncremental()?1:0,
                                odomPose.prettyPrint().c_str(),
                                (int)_optimizedPoses.size(),
                                _mapCorrection.prettyPrint().c_str(),
                                _lastLocalizationPose.prettyPrint().c_str(),
                                _lastLocalizationNodeId);
 
                if(!_memory->isIncremental() &&
                        !odomPose.isNull() &&
                        _optimizedPoses.size() &&
                        _mapCorrection.isIdentity() &&
                        !_lastLocalizationPose.isNull() &&
                        _lastLocalizationNodeId == 0)
                {
                        // Localization mode
                        if(!_optimizeFromGraphEnd)
                        {
                                //set map->odom so that odom is moved back to last saved localization
                                if(_graphOptimizer->isSlam2d())
                                {
                                        _mapCorrection = _lastLocalizationPose.to3DoF() * odomPose.to3DoF().inverse();
                                }
                                else if((!data.imu().empty() || _memory->isOdomGravityUsed()) && _graphOptimizer->gravitySigma()>0.0f)
                                {
                                        _mapCorrection = _lastLocalizationPose.to4DoF() * odomPose.to4DoF().inverse();
                                }
                                else
                                {
                                        _mapCorrection = _lastLocalizationPose * odomPose.inverse();
                                }
                                std::map<int, Transform> nodesOnly(_optimizedPoses.lower_bound(1), _optimizedPoses.end());
                                _lastLocalizationNodeId = graph::findNearestNode(nodesOnly, _lastLocalizationPose);
                                UWARN("Update map correction based on last localization saved in database! correction = %s, nearest id = %d of last pose = %s, odom = %s",
                                                _mapCorrection.prettyPrint().c_str(),
                                                _lastLocalizationNodeId,
                                                _lastLocalizationPose.prettyPrint().c_str(),
                                                odomPose.prettyPrint().c_str());
                        }
                        else
                        {
                                //move optimized poses accordingly to last saved localization
                                Transform mapCorrectionInv;
                                if(_graphOptimizer->isSlam2d())
                                {
                                        mapCorrectionInv = odomPose.to3DoF() * _lastLocalizationPose.to3DoF().inverse();
                                }
                                else if((!data.imu().empty() || _memory->isOdomGravityUsed()) && _graphOptimizer->gravitySigma()>0.0f)
                                {
                                        mapCorrectionInv = odomPose.to4DoF() * _lastLocalizationPose.to4DoF().inverse();
                                }
                                else
                                {
                                        mapCorrectionInv = odomPose * _lastLocalizationPose.inverse();
                                }
                                for(std::map<int, Transform>::iterator iter=_optimizedPoses.begin(); iter!=_optimizedPoses.end(); ++iter)
                                {
                                        iter->second = mapCorrectionInv * iter->second;
                                }
 
                                std::map<int, Transform> nodesOnly(_optimizedPoses.lower_bound(1), _optimizedPoses.end());
                                _lastLocalizationNodeId = graph::findNearestNode(nodesOnly, _lastLocalizationPose);
                                UWARN("Transformed map accordingly to last localization pose saved in database (%s=true)! nearest id = %d of last pose = %s",
                                                Parameters::kRGBDOptimizeFromGraphEnd().c_str(),
                                                _lastLocalizationNodeId,
                                                _lastLocalizationPose.prettyPrint().c_str());
                        }
                }
 
                if(odomPose.isNull())
                {
                        if(_memory->isIncremental())
                        {
                                UERROR("RGB-D SLAM mode is enabled, memory is incremental but no odometry is provided. "
                                           "Image %d is ignored!", data.id());
                                return false;
                        }
                        else // fake localization
                        {
                                if(!_mapCorrectionBackup.isNull())
                                {
                                        _mapCorrection = _mapCorrectionBackup;
                                        _mapCorrectionBackup.setNull();
                                }
                                if(_lastLocalizationPose.isNull())
                                {
                                        _lastLocalizationPose = Transform::getIdentity();
                                }
                                fakeOdom = true;
                                odomPose = _mapCorrection.inverse() * _lastLocalizationPose;
                                UDEBUG("Map correction = %s", _mapCorrection.prettyPrint().c_str());
                                UDEBUG("Last localization pose: %s", _lastLocalizationPose.prettyPrint().c_str());
                                UDEBUG("Fake odom: %s", odomPose.prettyPrint().c_str());
                        }
                }
                else if(_memory->isIncremental()) // only in mapping mode
                {
                        // Detect if the odometry is reset. If yes, trigger a new map.
                        if(_memory->getLastWorkingSignature())
                        {
                                const Transform & lastPose = _memory->getLastWorkingSignature()->getPose(); // use raw odometry
 
                                // look for identity
                                if(!lastPose.isIdentity() && odomPose.isIdentity())
                                {
                                        int mapId = triggerNewMap();
                                        UWARN("Odometry is reset (identity pose detected). Increment map id to %d!", mapId);
                                }
                                else if(_newMapOdomChangeDistance > 0.0)
                                {
                                        // look for large change
                                        Transform lastPoseToNewPose = lastPose.inverse() * odomPose;
                                        float x,y,z, roll,pitch,yaw;
                                        lastPoseToNewPose.getTranslationAndEulerAngles(x,y,z, roll,pitch,yaw);
                                        if((x*x + y*y + z*z) > _newMapOdomChangeDistance*_newMapOdomChangeDistance)
                                        {
                                                int mapId = triggerNewMap();
                                                UWARN("Odometry is reset (large odometry change detected > %f). A new map (%d) is created! Last pose = %s, new pose = %s",
                                                                _newMapOdomChangeDistance,
                                                                mapId,
                                                                lastPose.prettyPrint().c_str(),
                                                                odomPose.prettyPrint().c_str());
                                        }
                                }
                        }
                }
        }
 
        //============================================================
        // Memory Update : Location creation + Add to STM + Weight Update (Rehearsal)
        //============================================================
        ULOGGER_INFO("Updating memory...");
        if(_rgbdSlamMode)
        {
                if(!_memory->update(data, odomPose, odomCovariance, odomVelocity, &statistics_))
                {
                        return false;
                }
        }
        else
        {
                if(!_memory->update(data, Transform(), cv::Mat(), std::vector<float>(), &statistics_))
                {
                        return false;
                }
        }
 
        signature = _memory->getLastWorkingSignature();
        _currentSessionHasGPS = _currentSessionHasGPS || signature->sensorData().gps().stamp() > 0.0;
        if(!signature)
        {
                UFATAL("Not supposed to be here...last signature is null?!?");
        }
 
        ULOGGER_INFO("Processing signature %d w=%d map=%d", signature->id(), signature->getWeight(), signature->mapId());
        timeMemoryUpdate = timer.ticks();
        ULOGGER_INFO("timeMemoryUpdate=%fs", timeMemoryUpdate);
 
        //============================================================
        // Metric
        //============================================================
        bool smallDisplacement = false;
        bool tooFastMovement = false;
        std::list<int> signaturesRemoved;
        bool neighborLinkRefined = false;
        bool addedNewLandmark = false;
        float distanceToClosestNodeInTheGraph = 0;
        float angleToClosestNodeInTheGraph = 0;
        if(_rgbdSlamMode)
        {
                double linVar = odomCovariance.empty()?1.0f:uMax3(odomCovariance.at<double>(0,0), odomCovariance.at<double>(1,1)>=9999?0:odomCovariance.at<double>(1,1), odomCovariance.at<double>(2,2)>=9999?0:odomCovariance.at<double>(2,2));
                double angVar = odomCovariance.empty()?1.0f:uMax3(odomCovariance.at<double>(3,3)>=9999?0:odomCovariance.at<double>(3,3), odomCovariance.at<double>(4,4)>=9999?0:odomCovariance.at<double>(4,4), odomCovariance.at<double>(5,5));
                statistics_.addStatistic(Statistics::kMemoryOdometry_variance_lin(), (float)linVar);
                statistics_.addStatistic(Statistics::kMemoryOdometry_variance_ang(), (float)angVar);
 
                //Verify if there was a rehearsal
                int rehearsedId = (int)uValue(statistics_.data(), Statistics::kMemoryRehearsal_merged(), 0.0f);
                if(rehearsedId > 0)
                {
                        _optimizedPoses.erase(rehearsedId);
                }
                else
                {
                        if(_rgbdLinearUpdate > 0.0f || _rgbdAngularUpdate > 0.0f)
                        {
                                //============================================================
                                // Minimum displacement required to add to Memory
                                //============================================================
                                Transform t;
 
                                if(_memory->isIncremental())
                                {
                                        const std::multimap<int, Link> & links = signature->getLinks();
                                        if(links.size() && links.begin()->second.type() == Link::kNeighbor)
                                        {
                                                const Signature * s = _memory->getSignature(links.begin()->second.to());
                                                UASSERT(s!=0);
                                                // don't filter if the new node is not intermediate but previous one is
                                                if(signature->getWeight() < 0 || s->getWeight() >= 0)
                                                {
                                                        t = links.begin()->second.transform();
                                                }
                                        }
                                }
                                else if(!_odomCachePoses.empty())
                                {
                                        t = _odomCachePoses.rbegin()->second.inverse() * signature->getPose();
                                }
                                if(!t.isNull())
                                {
                                        float x,y,z, roll,pitch,yaw;
                                        t.getTranslationAndEulerAngles(x,y,z, roll,pitch,yaw);
                                        bool isMoving = fabs(x) > _rgbdLinearUpdate ||
                                                                        fabs(y) > _rgbdLinearUpdate ||
                                                                        fabs(z) > _rgbdLinearUpdate ||
                                                                        (_rgbdAngularUpdate>0.0f && (
                                                                                fabs(roll) > _rgbdAngularUpdate ||
                                                                                fabs(pitch) > _rgbdAngularUpdate ||
                                                                                fabs(yaw) > _rgbdAngularUpdate));
                                        if(!isMoving)
                                        {
                                                // This will disable global loop closure detection, only retrieval will be done.
                                                // The location will also be deleted at the end.
                                                smallDisplacement = true;
                                                UDEBUG("smallDisplacement: %f %f %f %f %f %f", x,y,z, roll,pitch,yaw);
                                        }
                                }
                        }
                        if(odomVelocity.size() == 6)
                        {
                                // This will disable global loop closure detection, only retrieval will be done.
                                // The location will also be deleted at the end.
                                tooFastMovement =
                                                (_rgbdLinearSpeedUpdate>0.0f && uMax3(fabs(odomVelocity[0]), fabs(odomVelocity[1]), fabs(odomVelocity[2])) > _rgbdLinearSpeedUpdate) ||
                                                (_rgbdAngularSpeedUpdate>0.0f && uMax3(fabs(odomVelocity[3]), fabs(odomVelocity[4]), fabs(odomVelocity[5])) > _rgbdAngularSpeedUpdate);
                        }
                }
 
                // Update optimizedPoses with the newly added node
                Transform newPose;
                bool intermediateNodeRefining = false;
                if(_neighborLinkRefining &&
                        signature->getLinks().size() &&
                        signature->getLinks().begin()->second.type() == Link::kNeighbor &&
                   _memory->isIncremental() && // ignore pose matching in localization mode
                   rehearsedId == 0 && // don't do it if rehearsal happened
                   !tooFastMovement) // ignore if too fast movement has been detected
                {
                        int oldId = signature->getLinks().begin()->first;
                        const Signature * oldS = _memory->getSignature(oldId);
                        UASSERT(oldS != 0);
 
                        if(signature->getWeight() >= 0 && oldS->getWeight()>=0) // ignore intermediate nodes
                        {
                                Transform guess = signature->getLinks().begin()->second.transform().inverse();
 
                                if(smallDisplacement)
                                {
                                        if(signature->getLinks().begin()->second.transVariance() == 1)
                                        {
                                                // set small variance
                                                UDEBUG("Set small variance. The robot is not moving.");
                                                _memory->updateLink(Link(oldId, signature->id(), signature->getLinks().begin()->second.type(), guess, cv::Mat::eye(6,6,CV_64FC1)*1000));
                                        }
                                }
                                else
                                {
                                        //============================================================
                                        // Refine neighbor links
                                        //============================================================
                                        UINFO("Odometry refining: guess = %s", guess.prettyPrint().c_str());
                                        RegistrationInfo info;
                                        Transform t = _memory->computeTransform(oldId, signature->id(), guess, &info);
                                        if(!t.isNull())
                                        {
                                                UINFO("Odometry refining: update neighbor link (%d->%d, variance:lin=%f, ang=%f) from %s to %s",
                                                                oldId,
                                                                signature->id(),
                                                                info.covariance.at<double>(0,0),
                                                                info.covariance.at<double>(5,5),
                                                                guess.prettyPrint().c_str(),
                                                                t.prettyPrint().c_str());
                                                UASSERT(info.covariance.at<double>(0,0) > 0.0 && info.covariance.at<double>(5,5) > 0.0);
                                                _memory->updateLink(Link(oldId, signature->id(), signature->getLinks().begin()->second.type(), t, info.covariance.inv()));
 
                                                if(_optimizeFromGraphEnd)
                                                {
                                                        // update all previous nodes
                                                        // Normally _mapCorrection should be identity, but if _optimizeFromGraphEnd
                                                        // parameters just changed state, we should put back all poses without map correction.
                                                        Transform u = guess * t.inverse();
                                                        std::map<int, Transform>::iterator jter = _optimizedPoses.find(oldId);
                                                        UASSERT(jter!=_optimizedPoses.end());
                                                        Transform up = jter->second * u * jter->second.inverse();
                                                        Transform mapCorrectionInv = _mapCorrection.inverse();
                                                        for(std::map<int, Transform>::iterator iter=_optimizedPoses.begin(); iter!=_optimizedPoses.end(); ++iter)
                                                        {
                                                                iter->second = mapCorrectionInv * up * iter->second;
                                                        }
                                                }
                                        }
                                        else
                                        {
                                                UINFO("Odometry refining rejected: %s", info.rejectedMsg.c_str());
                                                if(!info.covariance.empty() && info.covariance.at<double>(0,0) > 0.0 && info.covariance.at<double>(0,0) != 1.0 && info.covariance.at<double>(5,5) > 0.0 && info.covariance.at<double>(5,5) != 1.0)
                                                {
                                                        if(ULogger::level() <= ULogger::kInfo)
                                                        {
                                                                std::cout << info.covariance << std::endl;
                                                        }
                                                        _memory->updateLink(Link(oldId, signature->id(), signature->getLinks().begin()->second.type(), guess, (info.covariance*100.0).inv()));
                                                }
                                        }
                                        neighborLinkRefined = !t.isNull();
                                        statistics_.addStatistic(Statistics::kNeighborLinkRefiningAccepted(),neighborLinkRefined?1.0f:0);
                                        statistics_.addStatistic(Statistics::kNeighborLinkRefiningInliers(), info.inliers);
                                        statistics_.addStatistic(Statistics::kNeighborLinkRefiningICP_inliers_ratio(), info.icpInliersRatio);
                                        statistics_.addStatistic(Statistics::kNeighborLinkRefiningICP_rotation(), info.icpRotation);
                                        statistics_.addStatistic(Statistics::kNeighborLinkRefiningICP_translation(), info.icpTranslation);
                                        statistics_.addStatistic(Statistics::kNeighborLinkRefiningICP_complexity(), info.icpStructuralComplexity);
                                        statistics_.addStatistic(Statistics::kNeighborLinkRefiningPts(), signature->sensorData().laserScanRaw().size());
                                }
                                timeNeighborLinkRefining = timer.ticks();
                                ULOGGER_INFO("timeOdometryRefining=%fs", timeNeighborLinkRefining);
 
                                UASSERT(oldS->hasLink(signature->id()));
                                UASSERT(uContains(_optimizedPoses, oldId));
 
                                statistics_.addStatistic(Statistics::kNeighborLinkRefiningVariance(), oldS->getLinks().find(signature->id())->second.transVariance());
 
                                newPose = _optimizedPoses.at(oldId) * oldS->getLinks().find(signature->id())->second.transform();
                                _mapCorrection = newPose * signature->getPose().inverse();
                                if(_mapCorrection.getNormSquared() > 0.001f && _optimizeFromGraphEnd)
                                {
                                        UERROR("Map correction should be identity when optimizing from the last node. T=%s NewPose=%s OldPose=%s",
                                                        _mapCorrection.prettyPrint().c_str(),
                                                        newPose.prettyPrint().c_str(),
                                                        signature->getPose().prettyPrint().c_str());
                                }
                        }
                        else
                        {
                                newPose = _mapCorrection * signature->getPose();
                                intermediateNodeRefining = true;
                        }
                }
                else
                {
                        newPose = _mapCorrection * signature->getPose();
                }
 
                // Get statistics about the closest node in the graph
                if(!_memory->isIncremental())
                {
                        int closestNode = 0;
                        float sqrdDistance = 0.0f;
                        if(_optimizedPoses.begin()->first < 0)
                        {
                                std::map<int, Transform> poses(_optimizedPoses.lower_bound(1), _optimizedPoses.end());
                                closestNode = graph::findNearestNode(poses, newPose, &sqrdDistance);
                        }
                        else
                        {
                                closestNode = graph::findNearestNode(_optimizedPoses, newPose, &sqrdDistance);
                        }
                        if(closestNode>0 && sqrdDistance>0.0f)
                        {
                                distanceToClosestNodeInTheGraph = sqrt(sqrdDistance);
                                UDEBUG("Last localization pose = %s, closest node=%d (%f m)", newPose.prettyPrint().c_str(), closestNode, distanceToClosestNodeInTheGraph);
                                angleToClosestNodeInTheGraph = (newPose.inverse() * _optimizedPoses.at(closestNode)).getAngle();
                        }
                }
 
                UDEBUG("Added pose %s (odom=%s)", newPose.prettyPrint().c_str(), signature->getPose().prettyPrint().c_str());
                // Update Poses and Constraints
                _optimizedPoses.insert(std::make_pair(signature->id(), newPose));
                if(_memory->isIncremental() && signature->getWeight() >= 0)
                {
                        for(std::map<int, Link>::const_iterator iter = signature->getLandmarks().begin(); iter!=signature->getLandmarks().end(); ++iter)
                        {
                                if(_optimizedPoses.find(iter->first) == _optimizedPoses.end())
                                {
                                        _optimizedPoses.insert(std::make_pair(iter->first, newPose*iter->second.transform()));
                                        UDEBUG("Added landmark %d : %s", iter->first, (newPose*iter->second.transform()).prettyPrint().c_str());
                                        addedNewLandmark = true;
                                }
                                _constraints.insert(std::make_pair(iter->first, iter->second.inverse()));
                        }
                }
 
                float distanceTravelledOld = _distanceTravelled;
 
                // only in mapping mode we add a neighbor link
                if(signature->getLinks().size() &&
                   signature->getLinks().begin()->second.type() == Link::kNeighbor)
                {
                        // link should be old to new
                        UASSERT_MSG(signature->id() > signature->getLinks().begin()->second.to(),
                                        "Only forward links should be added.");
 
                        Link tmp = signature->getLinks().begin()->second.inverse();
 
                        if(!smallDisplacement)
                        {
                                _distanceTravelled += tmp.transform().getNorm();
                        }
 
                        // if the previous node is an intermediate node, remove it from the local graph
                        if(_constraints.size() &&
                           _constraints.rbegin()->second.to() == signature->getLinks().begin()->second.to())
                        {
                                const Signature * s = _memory->getSignature(signature->getLinks().begin()->second.to());
                                UASSERT(s!=0);
                                if(s->getWeight() == -1)
                                {
                                        tmp = _constraints.rbegin()->second.merge(tmp, tmp.type());
                                        _optimizedPoses.erase(s->id());
                                        _constraints.erase(--_constraints.end());
                                }
                        }
 
                        _constraints.insert(std::make_pair(tmp.from(), tmp));
                }
                // Localization mode stuff
                if( signature->getWeight() >= 0 &&
                        !smallDisplacement &&
                    odomCovariance.cols == 6 &&
                        odomCovariance.rows == 6 &&
                        odomCovariance.type() == CV_64FC1 &&
                        odomCovariance.at<double>(0,0) < 1)
                {
                        if( _memory->isIncremental() && _localizationCovariance.empty())
                        {
                                _localizationCovariance = cv::Mat::zeros(6,6,CV_64FC1);
                        }
                        if(_localizationCovariance.total() == 36)
                        {
#ifdef RTABMAP_MRPT
                                // Transform odometry covariance (which in base frame) into global frame
                                // "odometry error propagation law"
                                Eigen::Quaterniond rotation = _lastLocalizationPose.getQuaterniond();
                                mrpt::poses::CPose3D pose = mrpt::poses::CPose3D::FromQuaternion(mrpt::math::CQuaternionDouble(rotation.w(), rotation.x(), rotation.y(), rotation.z()));
                                mrpt::math::CMatrixDouble66 gaussian;
                                gaussian.loadFromRawPointer((const double*)odomCovariance.data);
                                mrpt::poses::CPose3DPDFGaussian gaussianTransformed(mrpt::poses::CPose3D(), gaussian);
                                gaussianTransformed.changeCoordinatesReference(pose);
                                _localizationCovariance += cv::Mat(6,6,CV_64FC1, gaussianTransformed.cov.data());
#else
                                // Assuming diagonal uniform covariance matrix!
                                // If variance is different for each axis,
                                // build rtabmap with MRPT to use approach above.
                                _localizationCovariance += odomCovariance;
#endif
                        }
                }
                _lastLocalizationPose = newPose; // keep in cache the latest corrected pose
                if(!_memory->isIncremental() && signature->getWeight() >= 0)
                {
                        UDEBUG("Update odometry localization cache (size=%d/%d)", (int)_odomCachePoses.size(), _maxOdomCacheSize);
                        if(!_odomCachePoses.empty())
                        {
                                float odomDistance = (_odomCachePoses.rbegin()->second.inverse() * signature->getPose()).getNorm();
                                if(!smallDisplacement)
                                {
                                        _distanceTravelled += odomDistance;
                                }
 
                                while(!_odomCachePoses.empty() && (int)_odomCachePoses.size() > _maxOdomCacheSize)
                                {
                                        _odomCacheConstraints.erase(_odomCachePoses.begin()->first);
                                        _odomCachePoses.erase(_odomCachePoses.begin());
                                }
                                if(!_odomCachePoses.empty())
                                {
                                        Link odomLink(_odomCachePoses.rbegin()->first,
                                                        signature->id(),
                                                        Link::kNeighbor,
                                                        _odomCachePoses.rbegin()->second.inverse() * signature->getPose(),
                                                        odomCovariance.inv());
                                        _odomCacheConstraints.insert(std::make_pair(_odomCachePoses.rbegin()->first, odomLink));
                                        UDEBUG("Added odom cov = %f %f", odomLink.transVariance(), odomLink.rotVariance());
                                }
                        }
 
                        _odomCachePoses.insert(std::make_pair(signature->id(), signature->getPose()));
                }
                _distanceTravelledSinceLastLocalization += _distanceTravelled - distanceTravelledOld;
 
                //============================================================
                // Reduced graph
                //============================================================
                //Verify if there are nodes that were merged through graph reduction
                if(statistics_.reducedIds().size())
                {
                        for(unsigned int i=0; i<_path.size(); ++i)
                        {
                                std::map<int, int>::const_iterator iter = statistics_.reducedIds().find(_path[i].first);
                                if(iter!= statistics_.reducedIds().end())
                                {
                                        // change path ID to loop closure ID
                                        _path[i].first = iter->second;
                                }
                        }
 
                        for(std::map<int, int>::const_iterator iter=statistics_.reducedIds().begin();
                                iter!=statistics_.reducedIds().end();
                                ++iter)
                        {
                                int erased = (int)_optimizedPoses.erase(iter->first);
                                if(erased)
                                {
                                        for(std::multimap<int, Link>::iterator jter = _constraints.begin(); jter!=_constraints.end();)
                                        {
                                                if(jter->second.from() == iter->first || jter->second.to() == iter->first)
                                                {
                                                        _constraints.erase(jter++);
                                                }
                                                else
                                                {
                                                        ++jter;
                                                }
                                        }
                                }
                        }
                }
 
                //============================================================
                // Local loop closure in TIME
                //============================================================
                if((_proximityByTime || intermediateNodeRefining) &&
                   rehearsedId == 0 && // don't do it if rehearsal happened
                   _memory->isIncremental() && // don't do it in localization mode
                   signature->getWeight()>=0)
                {
                        const std::set<int> & stm = _memory->getStMem();
                        for(std::set<int>::const_reverse_iterator iter = stm.rbegin(); iter!=stm.rend(); ++iter)
                        {
                                if(*iter != signature->id() &&
                                   signature->getLinks().find(*iter) == signature->getLinks().end() &&
                                   _memory->getSignature(*iter)->mapId() == signature->mapId() &&
                                   _memory->getSignature(*iter)->getWeight()>=0)
                                {
                                        std::string rejectedMsg;
                                        UDEBUG("Check local transform between %d and %d", signature->id(), *iter);
                                        RegistrationInfo info;
                                        Transform guess;
                                        if(_optimizedPoses.find(*iter) != _optimizedPoses.end())
                                        {
                                                guess = _optimizedPoses.at(*iter).inverse() * newPose;
                                        }
 
                                        // For proximity by time, correspondences should be already enough precise, so don't recompute them
                                        Transform transform = _memory->computeTransform(*iter, signature->id(), guess, &info, true);
 
                                        if(!transform.isNull())
                                        {
                                                transform = transform.inverse();
                                                UDEBUG("Add local loop closure in TIME (%d->%d) %s",
                                                                signature->id(),
                                                                *iter,
                                                                transform.prettyPrint().c_str());
                                                // Add a loop constraint
                                                UASSERT(info.covariance.at<double>(0,0) > 0.0 && info.covariance.at<double>(5,5) > 0.0);
                                                if(_memory->addLink(Link(signature->id(), *iter, Link::kLocalTimeClosure, transform, getInformation(info.covariance))))
                                                {
                                                        ++proximityDetectionsInTimeFound;
                                                        UINFO("Local loop closure found between %d and %d with t=%s",
                                                                        *iter, signature->id(), transform.prettyPrint().c_str());
                                                }
                                                else
                                                {
                                                        UWARN("Cannot add local loop closure between %d and %d ?!?",
                                                                        *iter, signature->id());
                                                }
                                        }
                                        else
                                        {
                                                UINFO("Local loop closure (time) between %d and %d rejected: %s",
                                                                *iter, signature->id(), rejectedMsg.c_str());
                                        }
 
                                        if(!_proximityByTime && intermediateNodeRefining)
                                        {
                                                // Do it only with the latest non-intermediate node
                                                break;
                                        }
                                }
                        }
                }
        }
 
        timeProximityByTimeDetection = timer.ticks();
        UINFO("timeProximityByTimeDetection=%fs", timeProximityByTimeDetection);
 
        //============================================================
        // Bayes filter update
        //============================================================
        bool localizationOnPreviousUpdate = false;
        if(_memory->isIncremental())
        {
                localizationOnPreviousUpdate =
                        signature->getLinks().size() &&
                        signature->getLinks().begin()->first!=signature->id() &&
                        _memory->getLoopClosureLinks(signature->getLinks().begin()->first, false).size() != 0;
        }
        else
        {
                // localization mode
 
                // Count how many localization links are in the constraints
                int localizationLinks = 0;
                int previousIdWithLocalizationLink = 0;
                for(std::multimap<int, Link>::iterator iter=_odomCacheConstraints.begin();
                                iter!=_odomCacheConstraints.end(); ++iter)
                {
                        if(previousIdWithLocalizationLink == iter->first)
                        {
                                // ignore links with node already counted
                                continue;
                        }
                        if(iter->second.type() == Link::kGlobalClosure ||
                           iter->second.type() == Link::kLocalSpaceClosure ||
                           iter->second.type() == Link::kLocalTimeClosure ||
                           iter->second.type() == Link::kUserClosure ||
                           iter->second.type() == Link::kNeighborMerged ||
                           iter->second.type() == Link::kLandmark)
                        {
                                ++localizationLinks;
                                previousIdWithLocalizationLink = iter->first;
                        }
                }
 
                localizationOnPreviousUpdate = localizationLinks > 1; // need two links in case we have delayed localization
        }
 
        // Not a bad signature, not an intermediate node, not a small displacement unless the previous signature didn't have a loop closure, not too fast movement
        if(!signature->isBadSignature() && signature->getWeight()>=0 && (!smallDisplacement || !localizationOnPreviousUpdate) && !tooFastMovement)
        {
                // If the working memory is empty, don't do the detection. It happens when it
                // is the first time the detector is started (there needs some images to
                // fill the short-time memory before a signature is added to the working memory).
                if(_memory->getWorkingMem().size())
                {
                        //============================================================
                        // Likelihood computation
                        // Get the likelihood of the new signature
                        // with all images contained in the working memory + reactivated.
                        //============================================================
                        ULOGGER_INFO("computing likelihood...");
 
                        std::list<int> signaturesToCompare;
                        GPS originGPS;
                        Transform originOffsetENU = Transform::getIdentity();
                        if(_loopGPS)
                        {
                                originGPS = signature->sensorData().gps();
                                if(originGPS.stamp() == 0.0 && _currentSessionHasGPS)
                                {
                                        UTimer tmpT;
                                        if(_optimizedPoses.size() && _memory->isIncremental())
                                        {
                                                //Search for latest node having GPS linked to current signature not too far.
                                                std::map<int, float> nearestIds = graph::findNearestNodes(signature->id(), _optimizedPoses, _localRadius);
                                                for(std::map<int, float>::reverse_iterator iter=nearestIds.rbegin(); iter!=nearestIds.rend() && iter->first>0; ++iter)
                                                {
                                                        const Signature * s = _memory->getSignature(iter->first);
                                                        UASSERT(s!=0);
                                                        if(s->sensorData().gps().stamp() > 0.0)
                                                        {
                                                                originGPS = s->sensorData().gps();
                                                                const Transform & sPose = _optimizedPoses.at(s->id());
                                                                Transform localToENU(0,0,(float)((-(originGPS.bearing()-90))*M_PI/180.0) - sPose.theta());
                                                                originOffsetENU = localToENU * (sPose.rotation()*(sPose.inverse()*_optimizedPoses.at(signature->id())));
                                                                break;
                                                        }
                                                }
                                        }
                                        //else if(!_memory->isIncremental()) // TODO, how can we estimate current GPS position in localization?
                                        //{
                                        //}
                                }
                                if(originGPS.stamp() > 0.0)
                                {
                                        // no need to save it if it is in localization mode
                                        _gpsGeocentricCache.insert(std::make_pair(signature->id(), std::make_pair(originGPS.toGeodeticCoords().toGeocentric_WGS84(), originOffsetENU)));
                                }
                        }
 
                        for(std::map<int, double>::const_iterator iter=_memory->getWorkingMem().begin();
                                iter!=_memory->getWorkingMem().end();
                                ++iter)
                        {
                                if(iter->first > 0)
                                {
                                        const Signature * s = _memory->getSignature(iter->first);
                                        UASSERT(s!=0);
                                        if(s->getWeight() != -1) // ignore intermediate nodes
                                        {
                                                bool accept = true;
                                                if(originGPS.stamp()>0.0)
                                                {
                                                        std::map<int, std::pair<cv::Point3d, Transform> >::iterator cacheIter = _gpsGeocentricCache.find(s->id());
                                                        if(cacheIter == _gpsGeocentricCache.end())
                                                        {
                                                                GPS gps = s->sensorData().gps();
                                                                Transform offsetENU = Transform::getIdentity();
                                                                if(gps.stamp()==0.0)
                                                                {
                                                                        _memory->getGPS(s->id(), gps, offsetENU, false);
                                                                }
                                                                if(gps.stamp() > 0.0)
                                                                {
                                                                        cacheIter = _gpsGeocentricCache.insert(
                                                                                        std::make_pair(s->id(),
                                                                                                        std::make_pair(gps.toGeodeticCoords().toGeocentric_WGS84(), offsetENU))).first;
                                                                }
                                                        }
 
 
                                                        if(cacheIter != _gpsGeocentricCache.end())
                                                        {
                                                                std::map<int, std::pair<cv::Point3d, Transform> >::iterator originIter = _gpsGeocentricCache.find(signature->id());
                                                                UASSERT(originIter != _gpsGeocentricCache.end());
                                                                cv::Point3d relativePose = GeodeticCoords::Geocentric_WGS84ToENU_WGS84(cacheIter->second.first, originIter->second.first, originGPS.toGeodeticCoords());
                                                                const double & error = originGPS.error();
                                                                const Transform & offsetENU = cacheIter->second.second;
                                                                relativePose.x += offsetENU.x() - originOffsetENU.x();
                                                                relativePose.y += offsetENU.y() - originOffsetENU.y();
                                                                relativePose.z += offsetENU.z() - originOffsetENU.z();
                                                                 // ignore altitude if difference is under GPS error
                                                                if(relativePose.z>error)
                                                                {
                                                                        relativePose.z -= error;
                                                                }
                                                                else if(relativePose.z < -error)
                                                                {
                                                                        relativePose.z += error;
                                                                }
                                                                else
                                                                {
                                                                        relativePose.z = 0;
                                                                }
                                                                accept = uNormSquared(relativePose.x, relativePose.y, relativePose.z) < _localRadius*_localRadius;
                                                        }
                                                }
 
                                                if(accept)
                                                {
                                                        signaturesToCompare.push_back(iter->first);
                                                }
                                        }
                                }
                                else
                                {
                                        // virtual signature should be added
                                        signaturesToCompare.push_back(iter->first);
                                }
                        }
 
                        rawLikelihood = _memory->computeLikelihood(signature, signaturesToCompare);
 
                        // Adjust the likelihood (with mean and std dev)
                        likelihood = rawLikelihood;
                        this->adjustLikelihood(likelihood);
 
                        timeLikelihoodCalculation = timer.ticks();
                        ULOGGER_INFO("timeLikelihoodCalculation=%fs",timeLikelihoodCalculation);
 
                        //============================================================
                        // Apply the Bayes filter
                        //  Posterior = Likelihood x Prior
                        //============================================================
                        ULOGGER_INFO("getting posterior...");
 
                        // Compute the posterior
                        posterior = _bayesFilter->computePosterior(_memory, likelihood);
                        timePosteriorCalculation = timer.ticks();
                        ULOGGER_INFO("timePosteriorCalculation=%fs",timePosteriorCalculation);
 
                        // For statistics, copy weights
                        if(_publishStats && (_publishLikelihood || _publishPdf))
                        {
                                weights = _memory->getWeights();
                        }
 
                        //============================================================
                        // Select the highest hypothesis
                        //============================================================
                        ULOGGER_INFO("creating hypotheses...");
                        if(posterior.size())
                        {
                                for(std::map<int, float>::const_reverse_iterator iter = posterior.rbegin(); iter != posterior.rend(); ++iter)
                                {
                                        if(iter->first > 0 && iter->second > _highestHypothesis.second)
                                        {
                                                _highestHypothesis = *iter;
                                        }
                                }
                                // With the virtual place, use sum of LC probabilities (1 - virtual place hypothesis).
                                _highestHypothesis.second = 1-posterior.begin()->second;
                        }
                        timeHypothesesCreation = timer.ticks();
                        ULOGGER_INFO("Highest hypothesis=%d, value=%f, timeHypothesesCreation=%fs", _highestHypothesis.first, _highestHypothesis.second, timeHypothesesCreation);
 
                        if(_highestHypothesis.first > 0)
                        {
                                float loopThr = _loopThr;
                                bool hasLoopClosureConstraints = false;
                                for(std::multimap<int, Link>::iterator iter=_odomCacheConstraints.begin(); iter!=_odomCacheConstraints.end() && !hasLoopClosureConstraints; ++iter)
                                {
                                        hasLoopClosureConstraints =
                                                        iter->second.type() == Link::kGlobalClosure ||
                                                        iter->second.type() == Link::kLocalSpaceClosure ||
                                                        iter->second.type() == Link::kLandmark;
                                }
                                if(     (( _memory->isIncremental() && !uContains(_optimizedPoses, _highestHypothesis.first)) || // not linked to previous map of that hypothesis
                                         (!_memory->isIncremental() && !hasLoopClosureConstraints)) && // not yet localized to any previous sessions
                                        _memory->getWorkingMem().size()>1 && // should have an old map (beside virtual signature)
                                        _rgbdSlamMode &&
                                        loopThr > _aggressiveLoopThr)
                                {
                                        // use the best hypothesis directly.
                                        UDEBUG("Using %s=%f", Parameters::kRGBDAggressiveLoopThr().c_str(), _aggressiveLoopThr);
                                        loopThr = _aggressiveLoopThr;
                                }
 
                                // Loop closure Threshold
                                if(_highestHypothesis.second >= loopThr)
                                {
                                        rejectedGlobalLoopClosure = true;
                                        if(posterior.size() <= 2 && loopThr>0.0f)
                                        {
                                                // Ignore loop closure if there is only one loop closure hypothesis
                                                UDEBUG("rejected hypothesis: single hypothesis");
                                        }
                                        else if(_verifyLoopClosureHypothesis && !_epipolarGeometry->check(signature, _memory->getSignature(_highestHypothesis.first)))
                                        {
                                                UWARN("rejected hypothesis: by epipolar geometry");
                                        }
                                        else if(_loopRatio > 0.0f && lastHighestHypothesis.second && _highestHypothesis.second < _loopRatio*lastHighestHypothesis.second)
                                        {
                                                UWARN("rejected hypothesis: not satisfying hypothesis ratio (%f < %f * %f)",
                                                                _highestHypothesis.second, _loopRatio, lastHighestHypothesis.second);
                                        }
                                        else if(_loopRatio > 0.0f && lastHighestHypothesis.second == 0)
                                        {
                                                UWARN("rejected hypothesis: last closure hypothesis is null (loop ratio is on)");
                                        }
                                        else
                                        {
                                                _loopClosureHypothesis = _highestHypothesis;
                                                rejectedGlobalLoopClosure = false;
                                        }
 
                                        timeHypothesesValidation = timer.ticks();
                                        ULOGGER_INFO("timeHypothesesValidation=%fs",timeHypothesesValidation);
                                }
                                else if(_highestHypothesis.second < _loopRatio*lastHighestHypothesis.second)
                                {
                                        // Used for Precision-Recall computation.
                                        // When analyzing logs, it's convenient to know
                                        // if the hypothesis would be rejected if T_loop would be lower.
                                        rejectedGlobalLoopClosure = true;
                                        UDEBUG("rejected hypothesis: under loop ratio %f < %f", _highestHypothesis.second, _loopRatio*lastHighestHypothesis.second);
                                }
 
                                //for statistic...
                                hypothesisRatio = _loopClosureHypothesis.second>0?_highestHypothesis.second/_loopClosureHypothesis.second:0;
                        }
                } // if(_memory->getWorkingMemSize())
        }// !isBadSignature
        else if(!signature->isBadSignature() && (smallDisplacement || tooFastMovement))
        {
                _highestHypothesis = lastHighestHypothesis;
                UDEBUG("smallDisplacement=%d tooFastMovement=%d", smallDisplacement?1:0, tooFastMovement?1:0);
        }
        else
        {
                UDEBUG("Ignoring likelihood and loop closure hypotheses as current signature doesn't have enough visual features.");
        }
 
        //============================================================
        // Before retrieval, make sure the trash has finished
        //============================================================
        _memory->joinTrashThread();
        timeEmptyingTrash = _memory->getDbSavingTime();
        timeJoiningTrash = timer.ticks();
        ULOGGER_INFO("Time emptying memory trash = %fs,  joining (actual overhead) = %fs", timeEmptyingTrash, timeJoiningTrash);
 
        //============================================================
        // RETRIEVAL 1/3 : Loop closure neighbors reactivation
        //============================================================
        int retrievalId = _highestHypothesis.first;
        std::list<int> reactivatedIds;
        double timeGetNeighborsTimeDb = 0.0;
        double timeGetNeighborsSpaceDb = 0.0;
        int immunizedGlobally = 0;
        int immunizedLocally = 0;
        int maxLocalLocationsImmunized = 0;
        if(_maxTimeAllowed != 0 || _maxMemoryAllowed != 0)
        {
                // with memory management, we have to immunize some nodes
                maxLocalLocationsImmunized = _localImmunizationRatio * float(_memory->getWorkingMem().size());
        }
        // no need to do retrieval or immunization of locations if memory management
        // is disabled and all nodes are in WM
        if(!(_memory->allNodesInWM() && maxLocalLocationsImmunized == 0))
        {
                if(retrievalId > 0)
                {
                        //Load neighbors
                        ULOGGER_INFO("Retrieving locations... around id=%d", retrievalId);
                        int neighborhoodSize = (int)_bayesFilter->getPredictionLC().size()-1;
                        UASSERT(neighborhoodSize >= 0);
                        ULOGGER_DEBUG("margin=%d maxRetieved=%d", neighborhoodSize, _maxRetrieved);
 
                        UTimer timeGetN;
                        unsigned int nbLoadedFromDb = 0;
                        std::set<int> reactivatedIdsSet;
                        std::map<int, int> neighbors;
                        int nbDirectNeighborsInDb = 0;
 
                        // priority in time
                        // Direct neighbors TIME
                        ULOGGER_DEBUG("In TIME");
                        neighbors = _memory->getNeighborsId(retrievalId,
                                        neighborhoodSize,
                                        _maxRetrieved,
                                        true,
                                        true,
                                        false,
                                        true,
                                        std::set<int>(),
                                        &timeGetNeighborsTimeDb);
                        ULOGGER_DEBUG("neighbors of %d in time = %d", retrievalId, (int)neighbors.size());
                        //Priority to locations near in time (direct neighbor) then by space (loop closure)
                        bool firstPassDone = false; // just to avoid checking to STM after the first pass
                        int m = 0;
                        while(m < neighborhoodSize)
                        {
                                std::set<int> idsSorted;
                                for(std::map<int, int>::iterator iter=neighbors.begin(); iter!=neighbors.end();)
                                {
                                        if(!firstPassDone && _memory->isInSTM(iter->first))
                                        {
                                                neighbors.erase(iter++);
                                        }
                                        else if(iter->second == m)
                                        {
                                                if(reactivatedIdsSet.find(iter->first) == reactivatedIdsSet.end())
                                                {
                                                        idsSorted.insert(iter->first);
                                                        reactivatedIdsSet.insert(iter->first);
 
                                                        if(m == 1 && _memory->getSignature(iter->first) == 0)
                                                        {
                                                                ++nbDirectNeighborsInDb;
                                                        }
 
                                                        //immunized locations in the neighborhood from being transferred
                                                        if(immunizedLocations.insert(iter->first).second)
                                                        {
                                                                ++immunizedGlobally;
                                                        }
 
                                                        //UDEBUG("nt=%d m=%d immunized=1", iter->first, iter->second);
                                                }
                                                neighbors.erase(iter++);
                                        }
                                        else
                                        {
                                                ++iter;
                                        }
                                }
                                firstPassDone = true;
                                reactivatedIds.insert(reactivatedIds.end(), idsSorted.rbegin(), idsSorted.rend());
                                ++m;
                        }
 
                        // neighbors SPACE, already added direct neighbors will be ignored
                        ULOGGER_DEBUG("In SPACE");
                        neighbors = _memory->getNeighborsId(retrievalId,
                                        neighborhoodSize,
                                        _maxRetrieved,
                                        true,
                                        false,
                                        false,
                                        false,
                                        std::set<int>(),
                                        &timeGetNeighborsSpaceDb);
                        ULOGGER_DEBUG("neighbors of %d in space = %d", retrievalId, (int)neighbors.size());
                        firstPassDone = false;
                        m = 0;
                        while(m < neighborhoodSize)
                        {
                                std::set<int> idsSorted;
                                for(std::map<int, int>::iterator iter=neighbors.begin(); iter!=neighbors.end();)
                                {
                                        if(!firstPassDone && _memory->isInSTM(iter->first))
                                        {
                                                neighbors.erase(iter++);
                                        }
                                        else if(iter->second == m)
                                        {
                                                if(reactivatedIdsSet.find(iter->first) == reactivatedIdsSet.end())
                                                {
                                                        idsSorted.insert(iter->first);
                                                        reactivatedIdsSet.insert(iter->first);
 
                                                        if(m == 1 && _memory->getSignature(iter->first) == 0)
                                                        {
                                                                ++nbDirectNeighborsInDb;
                                                        }
                                                        //UDEBUG("nt=%d m=%d", iter->first, iter->second);
                                                }
                                                neighbors.erase(iter++);
                                        }
                                        else
                                        {
                                                ++iter;
                                        }
                                }
                                firstPassDone = true;
                                reactivatedIds.insert(reactivatedIds.end(), idsSorted.rbegin(), idsSorted.rend());
                                ++m;
                        }
                        ULOGGER_INFO("neighborhoodSize=%d, "
                                        "reactivatedIds.size=%d, "
                                        "nbLoadedFromDb=%d, "
                                        "nbDirectNeighborsInDb=%d, "
                                        "time=%fs (%fs %fs)",
                                        neighborhoodSize,
                                        reactivatedIds.size(),
                                        (int)nbLoadedFromDb,
                                        nbDirectNeighborsInDb,
                                        timeGetN.ticks(),
                                        timeGetNeighborsTimeDb,
                                        timeGetNeighborsSpaceDb);
 
                }
        }
 
        //============================================================
        // RETRIEVAL 2/3 : Update planned path and get next nodes to retrieve
        //============================================================
        std::list<int> retrievalLocalIds;
        if(_rgbdSlamMode)
        {
                // Priority on locations on the planned path
                if(_path.size())
                {
                        updateGoalIndex();
 
                        float distanceSoFar = 0.0f;
                        // immunize all nodes after current node and
                        // retrieve nodes after current node in the maximum radius from the current node
                        for(unsigned int i=_pathCurrentIndex; i<_path.size(); ++i)
                        {
                                if(_localRadius > 0.0f && i != _pathCurrentIndex)
                                {
                                        distanceSoFar += _path[i-1].second.getDistance(_path[i].second);
                                }
 
                                if(distanceSoFar <= _localRadius)
                                {
                                        if(_memory->getSignature(_path[i].first) != 0)
                                        {
                                                if(immunizedLocations.insert(_path[i].first).second)
                                                {
                                                        ++immunizedLocally;
                                                }
                                                UDEBUG("Path immunization: node %d (dist=%fm)", _path[i].first, distanceSoFar);
                                        }
                                        else if(retrievalLocalIds.size() < _maxLocalRetrieved)
                                        {
                                                UINFO("retrieval of node %d on path (dist=%fm)", _path[i].first, distanceSoFar);
                                                retrievalLocalIds.push_back(_path[i].first);
                                                // retrieved locations are automatically immunized
                                        }
                                }
                                else
                                {
                                        UDEBUG("Stop on node %d (dist=%fm > %fm)",
                                                        _path[i].first, distanceSoFar, _localRadius);
                                        break;
                                }
                        }
                }
 
                if(!(_memory->allNodesInWM() && maxLocalLocationsImmunized == 0))
                {
                        // immunize the path from the nearest local location to the current location
                        if(immunizedLocally < maxLocalLocationsImmunized &&
                                _memory->isIncremental()) // Can only work in mapping mode
                        {
                                std::map<int ,Transform> poses;
                                // remove poses from STM
                                for(std::map<int, Transform>::iterator iter=_optimizedPoses.begin(); iter!=_optimizedPoses.end(); ++iter)
                                {
                                        if(iter->first > 0 && !_memory->isInSTM(iter->first))
                                        {
                                                poses.insert(*iter);
                                        }
                                }
                                int nearestId = graph::findNearestNode(poses, _optimizedPoses.at(signature->id()));
 
                                if(nearestId > 0 &&
                                        (_localRadius==0 ||
                                         _optimizedPoses.at(signature->id()).getDistance(_optimizedPoses.at(nearestId)) < _localRadius))
                                {
                                        std::multimap<int, int> links;
                                        for(std::multimap<int, Link>::iterator iter=_constraints.begin(); iter!=_constraints.end(); ++iter)
                                        {
                                                if(uContains(_optimizedPoses, iter->second.from()) && uContains(_optimizedPoses, iter->second.to()))
                                                {
                                                        links.insert(std::make_pair(iter->second.from(), iter->second.to()));
                                                        links.insert(std::make_pair(iter->second.to(), iter->second.from())); // <->
                                                }
                                        }
 
                                        std::list<std::pair<int, Transform> > path = graph::computePath(_optimizedPoses, links, nearestId, signature->id());
                                        if(path.size() == 0)
                                        {
                                                UWARN("Could not compute a path between %d and %d", nearestId, signature->id());
                                        }
                                        else
                                        {
                                                for(std::list<std::pair<int, Transform> >::iterator iter=path.begin();
                                                        iter!=path.end();
                                                        ++iter)
                                                {
                                                        if(iter->first>0)
                                                        {
                                                                if(immunizedLocally >= maxLocalLocationsImmunized)
                                                                {
                                                                        // set 20 to avoid this warning when starting mapping
                                                                        if(maxLocalLocationsImmunized > 20 && _someNodesHaveBeenTransferred)
                                                                        {
                                                                                UWARN("Could not immunize the whole local path (%d) between "
                                                                                          "%d and %d (max location immunized=%d). You may want "
                                                                                          "to increase RGBD/LocalImmunizationRatio (current=%f (%d of WM=%d)) "
                                                                                          "to be able to immunize longer paths.",
                                                                                                (int)path.size(),
                                                                                                nearestId,
                                                                                                signature->id(),
                                                                                                maxLocalLocationsImmunized,
                                                                                                _localImmunizationRatio,
                                                                                                maxLocalLocationsImmunized,
                                                                                                (int)_memory->getWorkingMem().size());
                                                                        }
                                                                        break;
                                                                }
                                                                else if(!_memory->isInSTM(iter->first))
                                                                {
                                                                        if(immunizedLocations.insert(iter->first).second)
                                                                        {
                                                                                ++immunizedLocally;
                                                                        }
                                                                        //UDEBUG("local node %d on path immunized=1", iter->first);
                                                                }
                                                        }
                                                }
                                        }
                                }
                        }
 
                        // retrieval based on the nodes close the the nearest pose in WM
                        // immunize closest nodes
                        std::map<int, float> nearNodes = graph::findNearestNodes(signature->id(), _optimizedPoses, _localRadius);
                        // sort by distance
                        std::multimap<float, int> nearNodesByDist;
                        for(std::map<int, float>::iterator iter=nearNodes.lower_bound(1); iter!=nearNodes.end(); ++iter)
                        {
                                nearNodesByDist.insert(std::make_pair(iter->second, iter->first));
                        }
                        UINFO("near nodes=%d, max local immunized=%d, ratio=%f WM=%d",
                                        (int)nearNodesByDist.size(),
                                        maxLocalLocationsImmunized,
                                        _localImmunizationRatio,
                                        (int)_memory->getWorkingMem().size());
                        for(std::multimap<float, int>::iterator iter=nearNodesByDist.begin();
                                iter!=nearNodesByDist.end() && (retrievalLocalIds.size() < _maxLocalRetrieved || immunizedLocally < maxLocalLocationsImmunized);
                                ++iter)
                        {
                                const Signature * s = _memory->getSignature(iter->second);
                                if(s!=0)
                                {
                                        // If there is a change of direction, better to be retrieving
                                        // ALL nearest signatures than only newest neighbors
                                        const std::multimap<int, Link> & links = s->getLinks();
                                        for(std::multimap<int, Link>::const_reverse_iterator jter=links.rbegin();
                                                jter!=links.rend() && retrievalLocalIds.size() < _maxLocalRetrieved;
                                                ++jter)
                                        {
                                                if(_memory->getSignature(jter->first) == 0)
                                                {
                                                        UINFO("retrieval of node %d on local map", jter->first);
                                                        retrievalLocalIds.push_back(jter->first);
                                                }
                                        }
                                        if(!_memory->isInSTM(s->id()) && immunizedLocally < maxLocalLocationsImmunized)
                                        {
                                                if(immunizedLocations.insert(s->id()).second)
                                                {
                                                        ++immunizedLocally;
                                                }
                                                //UDEBUG("local node %d (%f m) immunized=1", iter->second, iter->first);
                                        }
                                }
                        }
                        // well, if the maximum retrieved is not reached, look for neighbors in database
                        if(retrievalLocalIds.size() < _maxLocalRetrieved)
                        {
                                std::set<int> retrievalLocalIdsSet(retrievalLocalIds.begin(), retrievalLocalIds.end());
                                for(std::list<int>::iterator iter=retrievalLocalIds.begin();
                                        iter!=retrievalLocalIds.end() && retrievalLocalIds.size() < _maxLocalRetrieved;
                                        ++iter)
                                {
                                        std::map<int, int> ids = _memory->getNeighborsId(*iter, 2, _maxLocalRetrieved - (unsigned int)retrievalLocalIds.size() + 1, true, false);
                                        for(std::map<int, int>::reverse_iterator jter=ids.rbegin();
                                                jter!=ids.rend() && retrievalLocalIds.size() < _maxLocalRetrieved;
                                                ++jter)
                                        {
                                                if(_memory->getSignature(jter->first) == 0 &&
                                                   retrievalLocalIdsSet.find(jter->first) == retrievalLocalIdsSet.end())
                                                {
                                                        UINFO("retrieval of node %d on local map", jter->first);
                                                        retrievalLocalIds.push_back(jter->first);
                                                        retrievalLocalIdsSet.insert(jter->first);
                                                }
                                        }
                                }
                        }
 
                        // update Age of the close signatures (oldest the farthest)
                        for(std::multimap<float, int>::reverse_iterator iter=nearNodesByDist.rbegin(); iter!=nearNodesByDist.rend(); ++iter)
                        {
                                _memory->updateAge(iter->second);
                        }
 
                        // insert them first to make sure they are loaded.
                        reactivatedIds.insert(reactivatedIds.begin(), retrievalLocalIds.begin(), retrievalLocalIds.end());
                }
        }
 
        //============================================================
        // RETRIEVAL 3/3 : Load signatures from the database
        //============================================================
        if(reactivatedIds.size())
        {
                // Not important if the loop closure hypothesis don't have all its neighbors loaded,
                // only a loop closure link is added...
                signaturesRetrieved = _memory->reactivateSignatures(
                                reactivatedIds,
                                _maxRetrieved+(unsigned int)retrievalLocalIds.size(), // add path retrieved
                                timeRetrievalDbAccess);
 
                ULOGGER_INFO("retrieval of %d (db time = %fs)", (int)signaturesRetrieved.size(), timeRetrievalDbAccess);
 
                timeRetrievalDbAccess += timeGetNeighborsTimeDb + timeGetNeighborsSpaceDb;
                UINFO("total timeRetrievalDbAccess=%fs", timeRetrievalDbAccess);
 
                // Immunize just retrieved signatures
                immunizedLocations.insert(signaturesRetrieved.begin(), signaturesRetrieved.end());
 
                if(!signaturesRetrieved.empty() && !_globalScanMap.empty())
                {
                        UWARN("Some signatures have been retrieved from memory management, clearing global scan map...");
                        _globalScanMap.clear();
                        _globalScanMapPoses.clear();
                }
        }
        timeReactivations = timer.ticks();
        ULOGGER_INFO("timeReactivations=%fs", timeReactivations);
 
        //============================================================
        // Proximity detections
        //============================================================
        std::list<std::pair<int, int> > loopClosureLinksAdded;
        int loopClosureVisualInliers = 0; // for statistics
        float loopClosureVisualInliersRatio = 0.0f;
        int loopClosureVisualMatches = 0;
        float loopClosureLinearVariance = 0.0f;
        float loopClosureAngularVariance = 0.0f;
        float loopClosureVisualInliersMeanDist = 0;
        float loopClosureVisualInliersDistribution = 0;
 
        int proximityDetectionsAddedVisually = 0;
        int proximityDetectionsAddedByICPMulti = 0;
        int proximityDetectionsAddedByICPGlobal = 0;
        int lastProximitySpaceClosureId = 0;
        int proximitySpacePaths = 0;
        int localVisualPathsChecked = 0;
        int localScanPathsChecked = 0;
        int loopIdSuppressedByProximity = 0;
 
        if(_proximityBySpace &&
           _localRadius > 0 &&
           _rgbdSlamMode &&
           signature->getWeight() >= 0) // not an intermediate node
        {
                if(_startNewMapOnLoopClosure &&
                        _memory->getWorkingMem().size()>=2 && // must have an old map (+1 virtual place)
                        _localizationCovariance.empty() && // if we didn't localize yet
                        graph::filterLinks(signature->getLinks(), Link::kSelfRefLink).size() == 0) // alone in new session
                {
                        UINFO("Proximity detection by space disabled as if we force to have a global loop "
                                        "closure with previous map before doing proximity detections (%s=true).",
                                        Parameters::kRtabmapStartNewMapOnLoopClosure().c_str());
                }
                else if(_graphOptimizer->iterations() == 0)
                {
                        UWARN("Cannot do local loop closure detection in space if graph optimization is disabled!");
                }
                else
                {
                        // In localization mode, no need to check local loop
                        // closures if we are already localized by a landmark.
 
                        // don't do it if it is a small displacement unless the previous signature didn't have a loop closure
                        // don't do it if there is a too fast movement
                        if((!smallDisplacement || !localizationOnPreviousUpdate) && !tooFastMovement)
                        {
 
                                //============================================================
                                // LOCAL LOOP CLOSURE SPACE
                                //============================================================
 
                                //
                                // 1) compare visually with nearest locations
                                //
                                UDEBUG("Proximity detection (local loop closure in SPACE using matching images, local radius=%fm)", _localRadius);
                                std::map<int, float> nearestIds = graph::findNearestNodes(signature->id(), _optimizedPoses, _localRadius);
                                UDEBUG("nearestIds=%d/%d", (int)nearestIds.size(), (int)_optimizedPoses.size());
                                std::map<int, Transform> nearestPoses;
                                std::multimap<int, int> links;
                                if(_memory->isIncremental() && _proximityMaxGraphDepth>0)
                                {
                                        // get bidirectional links
                                        for(std::multimap<int, Link>::iterator iter=_constraints.begin(); iter!=_constraints.end(); ++iter)
                                        {
                                                if(uContains(_optimizedPoses, iter->second.from()) && uContains(_optimizedPoses, iter->second.to()))
                                                {
                                                        links.insert(std::make_pair(iter->second.from(), iter->second.to()));
                                                        links.insert(std::make_pair(iter->second.to(), iter->second.from())); // <->
                                                }
                                        }
                                }
                                for(std::map<int, float>::iterator iter=nearestIds.lower_bound(1); iter!=nearestIds.end(); ++iter)
                                {
                                        if(_memory->getStMem().find(iter->first) == _memory->getStMem().end())
                                        {
                                                if(_memory->isIncremental() && _proximityMaxGraphDepth > 0)
                                                {
                                                        std::list<std::pair<int, Transform> > path = graph::computePath(_optimizedPoses, links, signature->id(), iter->first);
                                                        UDEBUG("Graph depth to %d = %ld", iter->first, path.size());
                                                        if(!path.empty() && (int)path.size() <= _proximityMaxGraphDepth)
                                                        {
                                                                nearestPoses.insert(std::make_pair(iter->first, _optimizedPoses.at(iter->first)));
                                                        }
                                                }
                                                else
                                                {
                                                        nearestPoses.insert(std::make_pair(iter->first, _optimizedPoses.at(iter->first)));
                                                }
                                        }
                                }
                                UDEBUG("nearestPoses=%d", (int)nearestPoses.size());
 
                                // segment poses by paths, only one detection per path, landmarks are ignored
                                std::map<int, std::map<int, Transform> > nearestPathsNotSorted = getPaths(nearestPoses, _optimizedPoses.at(signature->id()), _proximityMaxGraphDepth);
                                UDEBUG("got %d paths", (int)nearestPathsNotSorted.size());
                                // sort nearest paths by highest likelihood (if two have same likelihood, sort by id)
                                std::map<NearestPathKey, std::map<int, Transform> > nearestPaths;
                                Transform currentPoseInv = _optimizedPoses.at(signature->id()).inverse();
                                for(std::map<int, std::map<int, Transform> >::const_iterator iter=nearestPathsNotSorted.begin();iter!=nearestPathsNotSorted.end(); ++iter)
                                {
                                        const std::map<int, Transform> & path = iter->second;
                                        float highestLikelihood = 0.0f;
                                        int highestLikelihoodId = iter->first;
                                        float smallestDistanceSqr = -1;
                                        for(std::map<int, Transform>::const_iterator jter=path.begin(); jter!=path.end(); ++jter)
                                        {
                                                float v = uValue(likelihood, jter->first, 0.0f);
                                                float distance = (currentPoseInv * jter->second).getNormSquared();
                                                if(v > highestLikelihood || (v == highestLikelihood && (smallestDistanceSqr < 0 || distance < smallestDistanceSqr)))
                                                {
                                                        highestLikelihood = v;
                                                        highestLikelihoodId = jter->first;
                                                        smallestDistanceSqr = distance;
                                                }
                                        }
                                        nearestPaths.insert(std::make_pair(NearestPathKey(highestLikelihood, highestLikelihoodId, smallestDistanceSqr), path));
                                }
                                UDEBUG("nearestPaths=%d proximityMaxPaths=%d", (int)nearestPaths.size(), _proximityMaxPaths);
 
                                timeProximityBySpaceSearch = timer.ticks();
                                ULOGGER_INFO("timeProximityBySpaceSearch=%fs", timeProximityBySpaceSearch);
 
                                float proximityFilteringRadius = _proximityFilteringRadius;
                                if(_maxLoopClosureDistance>0.0f && (proximityFilteringRadius <= 0.0f || _maxLoopClosureDistance<proximityFilteringRadius))
                                {
                                        proximityFilteringRadius = _maxLoopClosureDistance;
                                }
                                for(std::map<NearestPathKey, std::map<int, Transform> >::const_reverse_iterator iter=nearestPaths.rbegin();
                                        iter!=nearestPaths.rend() &&
                                        (_proximityMaxPaths <= 0 || localVisualPathsChecked < _proximityMaxPaths);
                                        ++iter)
                                {
                                        std::map<int, Transform> path = iter->second;
                                        UASSERT(path.size());
 
                                        //find the nearest pose on the path looking in the same direction
                                        path.insert(std::make_pair(signature->id(), _optimizedPoses.at(signature->id())));
                                        path = graph::findNearestPoses(signature->id(), path, _localRadius, _proximityAngle);
                                        //take the one with highest likelihood if not null
                                        int nearestId = 0;
                                        if(iter->first.likelihood > 0.0f &&
                                           path.find(iter->first.id)!=path.end())
                                        {
                                                nearestId = iter->first.id;
                                        }
                                        else
                                        {
                                                nearestId = rtabmap::graph::findNearestNode(path, _optimizedPoses.at(signature->id()));
                                        }
 
                                        if(nearestId > 0)
                                        {
                                                // nearest pose must not be linked to current location and enough close
                                                if(!signature->hasLink(nearestId) &&
                                                        (proximityFilteringRadius <= 0.0f ||
                                                         _optimizedPoses.at(signature->id()).getDistanceSquared(_optimizedPoses.at(nearestId)) < proximityFilteringRadius*proximityFilteringRadius))
                                                {
                                                        ++localVisualPathsChecked;
                                                        RegistrationInfo info;
                                                        Transform guess;
                                                        if(_proximityOdomGuess)
                                                        {
                                                                // Use odometry as guess so that correspondences can be computed by projection
                                                                guess = _optimizedPoses.at(nearestId).inverse()*_optimizedPoses.at(signature->id());
                                                        } //else: guess is null to make sure visual correspondences are globally computed
                                                        Transform transform = _memory->computeTransform(nearestId, signature->id(), guess, &info);
                                                        if(!transform.isNull())
                                                        {
                                                                transform = transform.inverse();
                                                                if(proximityFilteringRadius <= 0 || transform.getNormSquared() <= proximityFilteringRadius*proximityFilteringRadius)
                                                                {
                                                                        UINFO("[Visual] Add local loop closure in SPACE (%d->%d) %s",
                                                                                        signature->id(),
                                                                                        nearestId,
                                                                                        transform.prettyPrint().c_str());
                                                                        UASSERT(info.covariance.at<double>(0,0) > 0.0 && info.covariance.at<double>(5,5) > 0.0);
 
                                                                        //for statistics
                                                                        loopClosureVisualInliersMeanDist = info.inliersMeanDistance;
                                                                        loopClosureVisualInliersDistribution = info.inliersDistribution;
 
                                                                        ++proximityDetectionsAddedVisually;
                                                                        lastProximitySpaceClosureId = nearestId;
 
                                                                        loopClosureVisualInliers = info.inliers;
                                                                        loopClosureVisualInliersRatio = info.inliersRatio;
                                                                        loopClosureVisualMatches = info.matches;
 
                                                                        cv::Mat information = getInformation(info.covariance);
                                                                        loopClosureLinearVariance = 1.0/information.at<double>(0,0);
                                                                        loopClosureAngularVariance = 1.0/information.at<double>(5,5);
 
                                                                        Link::Type type = Link::kLocalSpaceClosure;
                                                                        if(_loopClosureHypothesis.first>0 &&
                                                                                nearestIds.find(_loopClosureHypothesis.first)!=nearestIds.end())
                                                                        {
                                                                                // Avoid transform computation on the global loop closure if a visual proximity
                                                                                // one has been detected close (inside proximity radius) to that hypothesis.
                                                                                UDEBUG("Proximity detection on %d is close to loop closure %d, ignoring loop closure transform estimation...",
                                                                                                nearestId, _loopClosureHypothesis.first);
 
                                                                                if(nearestId == _loopClosureHypothesis.first)
                                                                                {
                                                                                        type = Link::kGlobalClosure;
                                                                                        loopIdSuppressedByProximity = nearestId;
                                                                                }
                                                                                else if(loopIdSuppressedByProximity == 0)
                                                                                {
                                                                                        loopIdSuppressedByProximity = nearestId;
                                                                                }
                                                                        }
 
                                                                        _memory->addLink(Link(signature->id(), nearestId, type, transform, information));
                                                                        loopClosureLinksAdded.push_back(std::make_pair(signature->id(), nearestId));
                                                                }
                                                                else
                                                                {
                                                                        UWARN("Ignoring local loop closure with %d because resulting "
                                                                                  "transform is too large!? (%fm > %fm)",
                                                                                        nearestId, transform.getNorm(), proximityFilteringRadius);
                                                                }
                                                        }
                                                }
                                                else if(!signature->hasLink(nearestId) && proximityFilteringRadius>0.0f)
                                                {
                                                        UDEBUG("Skipping path %d as most likely ID %d is too far %f > %f (%s)",
                                                                iter->first.id,
                                                                nearestId,
                                                                _optimizedPoses.at(signature->id()).getDistance(_optimizedPoses.at(nearestId)),
                                                                proximityFilteringRadius,
                                                                Parameters::kRGBDProximityPathFilteringRadius().c_str());
                                                }
                                        }
                                }
 
                                timeProximityBySpaceVisualDetection = timer.ticks();
                                ULOGGER_INFO("timeProximityBySpaceVisualDetection=%fs", timeProximityBySpaceVisualDetection);
 
                                //
                                // 2) compare locally with nearest locations by scan matching
                                //
                                UDEBUG("Proximity detection (local loop closure in SPACE with scan matching)");
                                if( _proximityMaxNeighbors <= 0)
                                {
                                        UDEBUG("Proximity by scan matching is disabled (%s=%d).", Parameters::kRGBDProximityPathMaxNeighbors().c_str(), _proximityMaxNeighbors);
                                }
                                else if(!signature->sensorData().laserScanCompressed().isEmpty())
                                {
                                        proximitySpacePaths = (int)nearestPaths.size();
                                        for(std::map<NearestPathKey, std::map<int, Transform> >::const_reverse_iterator iter=nearestPaths.rbegin();
                                                        iter!=nearestPaths.rend() &&
                                                        (_proximityMaxPaths <= 0 || localScanPathsChecked < _proximityMaxPaths);
                                                        ++iter)
                                        {
                                                std::map<int, Transform> path = iter->second; // should contain only nodes (no landmarks)
                                                UASSERT(path.size());
                                                UASSERT(path.begin()->first > 0);
 
                                                //find the nearest pose on the path
                                                int nearestId = rtabmap::graph::findNearestNode(path, _optimizedPoses.at(signature->id()));
                                                UASSERT(nearestId > 0);
                                                //UDEBUG("Path %d (size=%d) distance=%fm", nearestId, (int)path.size(), _optimizedPoses.at(signature->id()).getDistance(_optimizedPoses.at(nearestId)));
 
                                                // nearest pose must be close and not linked to current location
                                                if(!signature->hasLink(nearestId))
                                                {
                                                        if(_proximityMaxNeighbors < _proximityMaxGraphDepth || _proximityMaxGraphDepth == 0)
                                                        {
                                                                std::map<int, Transform> filteredPath;
                                                                int i=0;
                                                                std::map<int, Transform>::iterator nearestIdIter = path.find(nearestId);
                                                                // "_proximityMaxNeighbors-1" means that if _proximityMaxNeighbors=1,
                                                                // only nearest node on the path is taken (no scan merging). Useful to find
                                                                // proximity detection between only 2 nodes with 360x360 lidar scans.
                                                                for(std::map<int, Transform>::iterator iter=nearestIdIter; iter!=path.end() && i<=_proximityMaxNeighbors-1; ++iter, ++i)
                                                                {
                                                                        filteredPath.insert(*iter);
                                                                }
                                                                i=1;
                                                                for(std::map<int, Transform>::reverse_iterator iter(nearestIdIter); iter!=path.rend() && i<=_proximityMaxNeighbors-1; ++iter, ++i)
                                                                {
                                                                        filteredPath.insert(*iter);
                                                                }
                                                                path = filteredPath;
                                                        }
 
                                                        // Assemble scans in the path and do ICP only
                                                        std::map<int, Transform> optimizedLocalPath;
                                                        if(_globalScanMap.empty() && _proximityRawPosesUsed)
                                                        {
                                                                //optimize the path's poses locally
                                                                cv::Mat covariance;
                                                                path = optimizeGraph(nearestId, uKeysSet(path), std::map<int, Transform>(), false, covariance);
                                                                // transform local poses in optimized graph referential
                                                                if(!uContains(path, nearestId))
                                                                {
                                                                        UERROR("Proximity path not containing nearest ID ?! Skipping this path.");
                                                                        continue;
                                                                }
                                                                Transform t = _optimizedPoses.at(nearestId) * path.at(nearestId).inverse();
 
                                                                for(std::map<int, Transform>::iterator jter=path.lower_bound(1); jter!=path.end(); ++jter)
                                                                {
                                                                        optimizedLocalPath.insert(std::make_pair(jter->first, t * jter->second));
                                                                }
                                                        }
                                                        else
                                                        {
                                                                optimizedLocalPath = path;
                                                        }
 
                                                        std::map<int, Transform> filteredPath;
                                                        if(_globalScanMap.empty() && optimizedLocalPath.size() > 2 && proximityFilteringRadius > 0.0f)
                                                        {
                                                                // path filtering
                                                                filteredPath = graph::radiusPosesFiltering(optimizedLocalPath, proximityFilteringRadius, 0, true);
                                                                // make sure the current pose is still here
                                                                filteredPath.insert(*optimizedLocalPath.find(nearestId));
                                                        }
                                                        else
                                                        {
                                                                filteredPath = optimizedLocalPath;
                                                        }
 
                                                        if(filteredPath.size() > 0)
                                                        {
                                                                // add current node to poses
                                                                filteredPath.insert(std::make_pair(signature->id(), _optimizedPoses.at(signature->id())));
                                                                //The nearest will be the reference for a loop closure transform
                                                                if(signature->getLinks().find(nearestId) == signature->getLinks().end())
                                                                {
                                                                        ++localScanPathsChecked;
                                                                        RegistrationInfo info;
                                                                        Transform transform;
                                                                        bool icpMulti = true;
                                                                        if(_globalScanMap.empty())
                                                                        {
                                                                                transform = _memory->computeIcpTransformMulti(signature->id(), nearestId, filteredPath, &info);
                                                                        }
                                                                        else
                                                                        {
                                                                                UASSERT_MSG(_globalScanMapPoses.find(nearestId) != _globalScanMapPoses.end(), uFormat("Pose of %d not found in global scan poses", nearestId).c_str());
                                                                                icpMulti = false;
                                                                                // use pre-assembled scan map
                                                                                SensorData assembledData;
                                                                                assembledData.setId(nearestId);
                                                                                assembledData.setLaserScan(
                                                                                                LaserScan(_globalScanMap,
                                                                                                        signature->sensorData().laserScanCompressed().maxPoints(),
                                                                                                        signature->sensorData().laserScanCompressed().rangeMax(),
                                                                                                        _globalScanMapPoses.at(nearestId).inverse() * (signature->sensorData().laserScanCompressed().is2d()?Transform(0,0,signature->sensorData().laserScanCompressed().localTransform().z(),0,0,0):Transform::getIdentity())));
                                                                                Signature nearestNode(assembledData);
                                                                                Transform guess = filteredPath.at(nearestId).inverse() * filteredPath.at(signature->id());
                                                                                transform = _memory->computeIcpTransform(nearestNode, *signature, guess, &info);
                                                                                if(!transform.isNull())
                                                                                {
                                                                                        transform = transform.inverse();
                                                                                }
                                                                        }
 
                                                                        if(!transform.isNull())
                                                                        {
                                                                                UINFO("[Scan matching] Add local loop closure in SPACE (%d->%d) %s",
                                                                                                signature->id(),
                                                                                                nearestId,
                                                                                                transform.prettyPrint().c_str());
 
                                                                                cv::Mat scanMatchingIds;
                                                                                if(_scanMatchingIdsSavedInLinks)
                                                                                {
                                                                                        std::stringstream stream;
                                                                                        stream << "SCANS:";
                                                                                        for(std::map<int, Transform>::iterator iter=optimizedLocalPath.begin(); iter!=optimizedLocalPath.end(); ++iter)
                                                                                        {
                                                                                                if(iter != optimizedLocalPath.begin())
                                                                                                {
                                                                                                        stream << ";";
                                                                                                }
                                                                                                stream << uNumber2Str(iter->first);
                                                                                        }
                                                                                        std::string scansStr = stream.str();
                                                                                        scanMatchingIds = cv::Mat(1, int(scansStr.size()+1), CV_8SC1, (void *)scansStr.c_str());
                                                                                        scanMatchingIds = compressData2(scanMatchingIds); // compressed
                                                                                }
 
                                                                                // set Identify covariance for laser scan matching only
                                                                                UASSERT(info.covariance.at<double>(0,0) > 0.0 && info.covariance.at<double>(5,5) > 0.0);
                                                                                _memory->addLink(Link(signature->id(), nearestId, Link::kLocalSpaceClosure, transform, getInformation(info.covariance)/_proximityMergedScanCovFactor, scanMatchingIds));
                                                                                loopClosureLinksAdded.push_back(std::make_pair(signature->id(), nearestId));
 
                                                                                if(icpMulti)
                                                                                {
                                                                                        ++proximityDetectionsAddedByICPMulti;
                                                                                }
                                                                                else
                                                                                {
                                                                                        ++proximityDetectionsAddedByICPGlobal;
                                                                                }
 
                                                                                // no local loop closure added visually
                                                                                if(proximityDetectionsAddedVisually == 0)
                                                                                {
                                                                                        lastProximitySpaceClosureId = nearestId;
                                                                                }
                                                                        }
                                                                        else
                                                                        {
                                                                                UINFO("Local scan matching rejected: %s", info.rejectedMsg.c_str());
                                                                        }
                                                                        if(!_globalScanMap.empty())
                                                                        {
                                                                                break;
                                                                        }
                                                                }
                                                        }
                                                }
                                                else
                                                {
                                                        //UDEBUG("Path %d ignored", nearestId);
                                                }
                                        }
                                }
                        }
                }
        }
        timeProximityBySpaceDetection = timer.ticks();
        ULOGGER_INFO("timeProximityBySpaceDetection=%fs", timeProximityBySpaceDetection);
 
        //=============================================================
        // Global loop closure detection
        // (updated: place this after retrieval to be sure that neighbors of the loop closure are in RAM)
        //=============================================================
        if(_loopClosureHypothesis.first>0)
        {
                if(loopIdSuppressedByProximity==0)
                {
                        //Compute transform if metric data are present
                        Transform transform;
                        RegistrationInfo info;
                        info.covariance = cv::Mat::eye(6,6,CV_64FC1);
                        if(_rgbdSlamMode)
                        {
                                transform = _memory->computeTransform(
                                                _loopClosureHypothesis.first,
                                                signature->id(),
                                                _loopClosureIdentityGuess?Transform::getIdentity():Transform(),
                                                &info);
 
                                loopClosureVisualInliersMeanDist = info.inliersMeanDistance;
                                loopClosureVisualInliersDistribution = info.inliersDistribution;
 
                                loopClosureVisualInliers = info.inliers;
                                loopClosureVisualInliersRatio = info.inliersRatio;
                                loopClosureVisualMatches = info.matches;
                                rejectedGlobalLoopClosure = transform.isNull();
                                if(rejectedGlobalLoopClosure)
                                {
                                        UWARN("Rejected loop closure %d -> %d: %s",
                                                        _loopClosureHypothesis.first, signature->id(), info.rejectedMsg.c_str());
                                }
                                else if(_maxLoopClosureDistance>0.0f && transform.getNorm() > _maxLoopClosureDistance)
                                {
                                        rejectedGlobalLoopClosure = true;
                                        UWARN("Rejected localization %d -> %d because distance to map (%fm) is over %s=%fm.",
                                                        _loopClosureHypothesis.first, signature->id(), transform.getNorm(), Parameters::kRGBDMaxLoopClosureDistance().c_str(), _maxLoopClosureDistance);
                                }
                                else
                                {
                                        transform = transform.inverse();
                                }
                        }
                        if(!rejectedGlobalLoopClosure)
                        {
                                // Make the new one the parent of the old one
                                UASSERT(info.covariance.at<double>(0,0) > 0.0 && info.covariance.at<double>(5,5) > 0.0);
                                
                                loopClosureLinearVariance = uMax3(info.covariance.at<double>(0,0), info.covariance.at<double>(1,1)>=9999?0:info.covariance.at<double>(1,1), info.covariance.at<double>(2,2)>=9999?0:info.covariance.at<double>(2,2));
                                loopClosureAngularVariance = uMax3(info.covariance.at<double>(3,3)>=9999?0:info.covariance.at<double>(3,3), info.covariance.at<double>(4,4)>=9999?0:info.covariance.at<double>(4,4), info.covariance.at<double>(5,5));
                                cv::Mat information = getInformation(info.covariance);
                                rejectedGlobalLoopClosure = !_memory->addLink(Link(signature->id(), _loopClosureHypothesis.first, Link::kGlobalClosure, transform, information));
                                if(!rejectedGlobalLoopClosure)
                                {
                                        loopClosureLinksAdded.push_back(std::make_pair(signature->id(), _loopClosureHypothesis.first));
                                }
                        }
 
                        if(rejectedGlobalLoopClosure)
                        {
                                _loopClosureHypothesis.first = 0;
                        }
                }
                else if(loopIdSuppressedByProximity != _loopClosureHypothesis.first)
                {
                        _loopClosureHypothesis.first = 0;
                }
        }
 
        timeAddLoopClosureLink = timer.ticks();
        ULOGGER_INFO("timeAddLoopClosureLink=%fs", timeAddLoopClosureLink);
 
        //============================================================
        // Landmark
        //============================================================
        std::map<int, std::set<int> > landmarksDetected; // <Landmark ID, list of nodes that saw this landmark>
        if(!signature->getLandmarks().empty() && !_graphOptimizer->landmarksIgnored())
        {
                bool hasGlobalLoopClosuresInOdomCache = !graph::filterLinks(_odomCacheConstraints, Link::kGlobalClosure, true).empty() || _loopClosureHypothesis.first != 0;
                UDEBUG("hasGlobalLoopClosuresInOdomCache=%d", hasGlobalLoopClosuresInOdomCache?1:0);
                for(std::map<int, Link>::const_iterator iter=signature->getLandmarks().begin(); iter!=signature->getLandmarks().end(); ++iter)
                {
                        if(uContains(_memory->getLandmarksIndex(), iter->first) &&
                                        _memory->getLandmarksIndex().find(iter->first)->second.size()>1)
                        {
                                if(!_memory->isIncremental() &&          // In localization mode
                                        !hasGlobalLoopClosuresInOdomCache && // If there are global loop closures in odom cache, we can keep far landmarks
                                        _localRadius>0.0 &&
                                        iter->second.transform().getNormSquared() > _localRadius*_localRadius)
                                {
                                        // Ignore landmark detections over local radius
                                        UWARN("Ignoring landmark %d for localization as it is too far (%fm > %s=%f) "
                                                        "and odom cache doesn't contain global loop closure(s).",
                                                        iter->first,
                                                        iter->second.transform().getNorm(),
                                                        Parameters::kRGBDLocalRadius().c_str(),
                                                        _localRadius);
                                }
                                else
                                {
                                        UINFO("Landmark %d observed again! Seen the first time by node %d.", -iter->first, *_memory->getLandmarksIndex().find(iter->first)->second.begin());
                                        landmarksDetected.insert(std::make_pair(iter->first, _memory->getLandmarksIndex().find(iter->first)->second));
                                        rejectedGlobalLoopClosure = false; // If it was true, it will be set back to false if landmarks are rejected on graph optimization
                                        loopClosureLinksAdded.push_back(std::make_pair(signature->id(), iter->first));
                                }
                        }
                }
        }
 
        //============================================================
        // Add virtual links if a path is activated
        //============================================================
        if(_path.size())
        {
                // Add a virtual loop closure link to keep the path linked to local map
                if( signature->id() != _path[_pathCurrentIndex].first &&
                        !signature->hasLink(_path[_pathCurrentIndex].first))
                {
                        UASSERT(uContains(_optimizedPoses, signature->id()));
                        UASSERT_MSG(uContains(_optimizedPoses, _path[_pathCurrentIndex].first), uFormat("id=%d", _path[_pathCurrentIndex].first).c_str());
                        Transform virtualLoop = _optimizedPoses.at(signature->id()).inverse() * _optimizedPoses.at(_path[_pathCurrentIndex].first);
 
                        if(_localRadius == 0.0f || virtualLoop.getNorm() < _localRadius)
                        {
                                _memory->addLink(Link(signature->id(), _path[_pathCurrentIndex].first, Link::kVirtualClosure, virtualLoop, cv::Mat::eye(6,6,CV_64FC1)*0.01)); // set high variance
                        }
                        else
                        {
                                UERROR("Virtual link larger than local radius (%fm > %fm). Aborting the plan!",
                                                virtualLoop.getNorm(), _localRadius);
                                this->clearPath(-1);
                        }
                }
        }
 
        //============================================================
        // Optimize map graph
        //============================================================
        float maxLinearError = 0.0f;
        float maxLinearErrorRatio = 0.0f;
        float maxAngularError = 0.0f;
        float maxAngularErrorRatio = 0.0f;
        double optimizationError = 0.0;
        int optimizationIterations = 0;
        Transform previousMapCorrection;
        bool rejectedLandmark = false;
        bool delayedLocalization = false;
        UDEBUG("RGB-D SLAM mode: %d", _rgbdSlamMode?1:0);
        UDEBUG("Incremental: %d", _memory->isIncremental());
        UDEBUG("Loop hyp: %d", _loopClosureHypothesis.first);
        UDEBUG("Last prox: %d", lastProximitySpaceClosureId);
        UDEBUG("Reduced ids: %d", (int)statistics_.reducedIds().size());
        UDEBUG("Has prior: %d (prior ignored=%d)", signature->hasLink(signature->id(), Link::kPosePrior)?1:0, _graphOptimizer->priorsIgnored()?1:0);
        UDEBUG("Has gravity: %d (sigma=%f, odomGravity=%d, refined=%d)", signature->hasLink(signature->id(), Link::kGravity)?1:0, _graphOptimizer->gravitySigma(), _memory->isOdomGravityUsed()?1:0, neighborLinkRefined?1:0);
        UDEBUG("Has virtual link: %d", (int)graph::filterLinks(signature->getLinks(), Link::kVirtualClosure, true).size());
        UDEBUG("Prox Time: %d", proximityDetectionsInTimeFound);
        UDEBUG("Landmarks: %d", (int)landmarksDetected.size());
        UDEBUG("Retrieved: %d", (int)signaturesRetrieved.size());
        UDEBUG("Not self ref links: %d", (int)graph::filterLinks(signature->getLinks(), Link::kSelfRefLink).size());
 
        if(_rgbdSlamMode
                &&
                (_loopClosureHypothesis.first>0 ||
             lastProximitySpaceClosureId>0 || // can be different map of the current one
             statistics_.reducedIds().size() ||
                 (signature->hasLink(signature->id(), Link::kPosePrior) && !_graphOptimizer->priorsIgnored()) || // prior edge
                 (signature->hasLink(signature->id(), Link::kGravity) && _graphOptimizer->gravitySigma()>0.0f && (!_memory->isOdomGravityUsed() || neighborLinkRefined)) || // gravity edge
             proximityDetectionsInTimeFound>0 ||
                 !landmarksDetected.empty() ||
                 signaturesRetrieved.size()) // can be different map of the current one
                 &&
                 (_memory->isIncremental() ||
                  // In localization mode, the new node should be linked to another node or a landmark already in the working memory
                  graph::filterLinks(graph::filterLinks(signature->getLinks(), Link::kVirtualClosure), Link::kSelfRefLink).size() ||
                  !landmarksDetected.empty()))
        {
                UASSERT(uContains(_optimizedPoses, signature->id()));
 
                //used in localization mode: filter virtual links
                std::multimap<int, Link> localizationLinks = graph::filterLinks(signature->getLinks(), Link::kVirtualClosure);
                localizationLinks = graph::filterLinks(localizationLinks, Link::kSelfRefLink);
                if(!landmarksDetected.empty() && !_memory->isIncremental())
                {
                        for(std::map<int, std::set<int> >::iterator iter=landmarksDetected.begin(); iter!=landmarksDetected.end(); ++iter)
                        {
                                if(_optimizedPoses.find(iter->first)!=_optimizedPoses.end())
                                {
                                        UASSERT(uContains(signature->getLandmarks(), iter->first));
                                        localizationLinks.insert(std::make_pair(iter->first, signature->getLandmarks().at(iter->first)));
                                }
                        }
                }
 
                bool allLocalizationLinksInGraph = !localizationLinks.empty();
                for(std::multimap<int, Link>::iterator iter=localizationLinks.begin(); iter!=localizationLinks.end(); ++iter)
                {
                        if(!uContains(_optimizedPoses, iter->first))
                        {
                                allLocalizationLinksInGraph = false;
                                break;
                        }
                }
 
                // Note that in localization mode, we don't re-optimize the graph
                // if:
                //  1- there are no signatures retrieved,
                //  2- we are relocalizing on a node already in the optimized graph
                if(!_memory->isIncremental() &&
                   signaturesRetrieved.empty() &&
                   !localizationLinks.empty() &&
                   allLocalizationLinksInGraph)
                {
                        bool rejectLocalization = _odomCachePoses.empty();
                        if(!_odomCachePoses.empty())
                        {
                                // Verify if the new localization is valid by checking if there is
                                // not too much deformation using current odometry poses
                                // This will also refine localization links
 
                                std::map<int, Transform> poses = _odomCachePoses;
                                std::multimap<int, Link> constraints = _odomCacheConstraints;
                                // add self referring links (e.g., gravity)
                                std::multimap<int, Link> selfLinks = graph::filterLinks(signature->getLinks(), Link::kSelfRefLink, true);
                                if(_graphOptimizer->priorsIgnored())
                                {
                                        selfLinks = graph::filterLinks(selfLinks, Link::kPosePrior);
                                }
                                constraints.insert(selfLinks.begin(), selfLinks.end());
                                for(std::multimap<int, Link>::iterator iter=localizationLinks.begin(); iter!=localizationLinks.end(); ++iter)
                                {
                                        constraints.insert(std::make_pair(iter->second.from(), iter->second));
                                }
                                cv::Mat priorInfMat = cv::Mat::eye(6,6, CV_64FC1)*_localizationPriorInf;
                                for(std::multimap<int, Link>::iterator iter=constraints.begin(); iter!=constraints.end(); ++iter)
                                {
                                        std::map<int, Transform>::iterator iterPose = _optimizedPoses.find(iter->second.to());
                                        if(iterPose != _optimizedPoses.end() && poses.find(iterPose->first) == poses.end())
                                        {
                                                poses.insert(*iterPose);
                                                // make the poses in the map fixed
                                                constraints.insert(std::make_pair(iterPose->first, Link(iterPose->first, iterPose->first, Link::kPosePrior, iterPose->second, priorInfMat)));
                                                UDEBUG("Constraint %d->%d: %s (type=%s, var=%f)", iterPose->first, iterPose->first, iterPose->second.prettyPrint().c_str(), Link::typeName(Link::kPosePrior).c_str(), 1./_localizationPriorInf);
                                        }
                                        UDEBUG("Constraint %d->%d: %s (type=%s, var = %f %f)", iter->second.from(), iter->second.to(), iter->second.transform().prettyPrint().c_str(), iter->second.typeName().c_str(), iter->second.transVariance(), iter->second.rotVariance());
                                }
 
                                std::map<int, Transform> posesOut;
                                std::multimap<int, Link> edgeConstraintsOut;
                                bool priorsIgnored = _graphOptimizer->priorsIgnored();
                                UDEBUG("priorsIgnored was %s", priorsIgnored?"true":"false");
                                _graphOptimizer->setPriorsIgnored(false); //temporary set false to use priors above to fix nodes of the map
                                // If slam2d: get connected graph while keeping original roll,pitch,z values.
                                _graphOptimizer->getConnectedGraph(signature->id(), poses, constraints, posesOut, edgeConstraintsOut);
                                if(ULogger::level() == ULogger::kDebug)
                                {
                                        for(std::map<int, Transform>::iterator iter=posesOut.begin(); iter!=posesOut.end(); ++iter)
                                        {
                                                UDEBUG("Pose %d %s", iter->first, iter->second.prettyPrint().c_str());
                                        }
                                }
                                cv::Mat locOptCovariance;
                                std::map<int, Transform> optPoses;
                                if(!posesOut.empty() &&
                                   posesOut.begin()->first < _odomCachePoses.begin()->first)
                                {
                                        optPoses = _graphOptimizer->optimize(posesOut.begin()->first, posesOut, edgeConstraintsOut, locOptCovariance);
                                }
                                else
                                {
                                        UERROR("Invalid localization constraints");
                                }
                                _graphOptimizer->setPriorsIgnored(priorsIgnored); // set back
                                for(std::map<int, Transform>::iterator iter=optPoses.begin(); iter!=optPoses.end(); ++iter)
                                {
                                        UDEBUG("Opt  %d %s", iter->first, iter->second.prettyPrint().c_str());
                                }
 
                                if(optPoses.empty())
                                {
                                        UWARN("Optimization failed, rejecting localization!");
                                        rejectLocalization = true;
                                }
                                else
                                {
                                        UINFO("Compute max graph errors...");
                                        const Link * maxLinearLink = 0;
                                        const Link * maxAngularLink = 0;
                                        graph::computeMaxGraphErrors(
                                                        optPoses,
                                                        edgeConstraintsOut,
                                                        maxLinearErrorRatio,
                                                        maxAngularErrorRatio,
                                                        maxLinearError,
                                                        maxAngularError,
                                                        &maxLinearLink,
                                                        &maxAngularLink,
                                                        _graphOptimizer->isSlam2d());
                                        if(maxLinearLink == 0 && maxAngularLink==0)
                                        {
                                                UWARN("Could not compute graph errors! Rejecting localization!");
                                                rejectLocalization = true;
                                        }
 
                                        if(maxLinearLink)
                                        {
                                                UINFO("Max optimization linear error = %f m (link %d->%d, var=%f, ratio error/std=%f, thr=%f)",
                                                                maxLinearError,
                                                                maxLinearLink->from(),
                                                                maxLinearLink->to(),
                                                                maxLinearLink->transVariance(),
                                                                maxLinearError/sqrt(maxLinearLink->transVariance()),
                                                                _optimizationMaxError);
                                                if(_optimizationMaxError > 0.0f && maxLinearErrorRatio > _optimizationMaxError)
                                                {
                                                        UWARN("Rejecting localization (%d <-> %d) in this "
                                                                        "iteration because a wrong loop closure has been "
                                                                        "detected after graph optimization, resulting in "
                                                                        "a maximum graph error ratio of %f (edge %d->%d, type=%d, abs error=%f m, stddev=%f). The "
                                                                        "maximum error ratio parameter \"%s\" is %f of std deviation.",
                                                                        localizationLinks.rbegin()->second.from(),
                                                                        localizationLinks.rbegin()->second.to(),
                                                                        maxLinearErrorRatio,
                                                                        maxLinearLink->from(),
                                                                        maxLinearLink->to(),
                                                                        maxLinearLink->type(),
                                                                        maxLinearError,
                                                                        sqrt(maxLinearLink->transVariance()),
                                                                        Parameters::kRGBDOptimizeMaxError().c_str(),
                                                                        _optimizationMaxError);
                                                        rejectLocalization = true;
                                                }
                                                else if(_optimizationMaxError == 0.0f && maxLinearErrorRatio>100 && !_graphOptimizer->isRobust())
                                                {
                                                        UERROR("Huge optimization error detected!"
                                                                        "Linear error ratio of %f (edge %d->%d, type=%d, abs error=%f m, stddev=%f). You may consider "
                                                                        "enabling \"%s\" to reject those bad optimizations by setting it to a non null value!",
                                                                        maxLinearErrorRatio,
                                                                        maxLinearLink->from(),
                                                                        maxLinearLink->to(),
                                                                        maxLinearLink->type(),
                                                                        maxLinearError,
                                                                        sqrt(maxLinearLink->transVariance()),
                                                                        Parameters::kRGBDOptimizeMaxError().c_str());
                                                }
                                        }
                                        if(maxAngularLink)
                                        {
                                                UINFO("Max optimization angular error = %f deg (link %d->%d, var=%f, ratio error/std=%f, thr=%f)",
                                                                maxAngularError*180.0f/CV_PI,
                                                                maxAngularLink->from(),
                                                                maxAngularLink->to(),
                                                                maxAngularLink->rotVariance(),
                                                                maxAngularError/sqrt(maxAngularLink->rotVariance()),
                                                                _optimizationMaxError);
                                                if(_optimizationMaxError > 0.0f && maxAngularErrorRatio > _optimizationMaxError)
                                                {
                                                        UWARN("Rejecting localization (%d <-> %d) in this "
                                                                        "iteration because a wrong loop closure has been "
                                                                        "detected after graph optimization, resulting in "
                                                                        "a maximum graph error ratio of %f (edge %d->%d, type=%d, abs error=%f deg, stddev=%f). The "
                                                                        "maximum error ratio parameter \"%s\" is %f of std deviation.",
                                                                        localizationLinks.rbegin()->second.from(),
                                                                        localizationLinks.rbegin()->second.to(),
                                                                        maxAngularErrorRatio,
                                                                        maxAngularLink->from(),
                                                                        maxAngularLink->to(),
                                                                        maxAngularLink->type(),
                                                                        maxAngularError*180.0f/CV_PI,
                                                                        sqrt(maxAngularLink->rotVariance()),
                                                                        Parameters::kRGBDOptimizeMaxError().c_str(),
                                                                        _optimizationMaxError);
                                                        rejectLocalization = true;
                                                }
                                                else if(_optimizationMaxError == 0.0f && maxAngularErrorRatio>100 && !_graphOptimizer->isRobust())
                                                {
                                                        UERROR("Huge optimization error detected!"
                                                                        "Angular error ratio of %f (edge %d->%d, type=%d, abs error=%f m, stddev=%f). You may consider "
                                                                        "enabling \"%s\" to reject those bad optimizations by setting it to a non null value!",
                                                                        maxAngularErrorRatio,
                                                                        maxAngularLink->from(),
                                                                        maxAngularLink->to(),
                                                                        maxAngularLink->type(),
                                                                        maxAngularError*180.0f/CV_PI,
                                                                        sqrt(maxAngularLink->rotVariance()),
                                                                        Parameters::kRGBDOptimizeMaxError().c_str());
                                                }
                                        }
                                }
 
                                bool hasGlobalLoopClosuresOrLandmarks = false;
                                if(rejectLocalization && !graph::filterLinks(constraints, Link::kLocalSpaceClosure, true).empty())
                                {
                                        // Let's try again without local loop closures
                                        localizationLinks = graph::filterLinks(localizationLinks, Link::kLocalSpaceClosure);
                                        constraints = graph::filterLinks(constraints, Link::kLocalSpaceClosure);
                                        for(std::multimap<int, Link>::iterator iter=constraints.begin(); iter!=constraints.end() && !hasGlobalLoopClosuresOrLandmarks; ++iter)
                                        {
                                                hasGlobalLoopClosuresOrLandmarks =
                                                                iter->second.type() == Link::kGlobalClosure ||
                                                                iter->second.type() == Link::kLandmark;
                                        }
                                        if(hasGlobalLoopClosuresOrLandmarks && !localizationLinks.empty())
                                        {
                                                rejectLocalization = false;
                                                UWARN("Global and loop closures seem not tallying together, try again to optimize without local loop closures...");
                                                priorsIgnored = _graphOptimizer->priorsIgnored();
                                                UDEBUG("priorsIgnored was %s", priorsIgnored?"true":"false");
                                                _graphOptimizer->setPriorsIgnored(false); //temporary set false to use priors above to fix nodes of the map
                                                // If slam2d: get connected graph while keeping original roll,pitch,z values.
                                                _graphOptimizer->getConnectedGraph(signature->id(), poses, constraints, posesOut, edgeConstraintsOut);
                                                optPoses.clear();
                                                if(!posesOut.empty() &&
                                                   posesOut.begin()->first < _odomCachePoses.begin()->first)
                                                {
                                                        optPoses = _graphOptimizer->optimize(posesOut.begin()->first, posesOut, edgeConstraintsOut, locOptCovariance);
                                                }
                                                else
                                                {
                                                        UERROR("Invalid localization constraints");
                                                }
                                                _graphOptimizer->setPriorsIgnored(priorsIgnored); // set back
                                                for(std::map<int, Transform>::iterator iter=optPoses.begin(); iter!=optPoses.end(); ++iter)
                                                {
                                                        UDEBUG("Opt2  %d %s", iter->first, iter->second.prettyPrint().c_str());
                                                }
 
                                                if(optPoses.empty())
                                                {
                                                        UWARN("Optimization failed, rejecting localization!");
                                                        rejectLocalization = true;
                                                }
                                                else
                                                {
                                                        UINFO("Compute max graph errors...");
                                                        const Link * maxLinearLink = 0;
                                                        const Link * maxAngularLink = 0;
                                                        graph::computeMaxGraphErrors(
                                                                        optPoses,
                                                                        edgeConstraintsOut,
                                                                        maxLinearErrorRatio,
                                                                        maxAngularErrorRatio,
                                                                        maxLinearError,
                                                                        maxAngularError,
                                                                        &maxLinearLink,
                                                                        &maxAngularLink,
                                                                        _graphOptimizer->isSlam2d());
                                                        if(maxLinearLink == 0 && maxAngularLink==0)
                                                        {
                                                                UWARN("Could not compute graph errors! Rejecting localization!");
                                                                rejectLocalization = true;
                                                        }
 
                                                        if(maxLinearLink)
                                                        {
                                                                UINFO("Max optimization linear error = %f m (link %d->%d, var=%f, ratio error/std=%f, thr=%f)",
                                                                                maxLinearError,
                                                                                maxLinearLink->from(),
                                                                                maxLinearLink->to(),
                                                                                maxLinearLink->transVariance(),
                                                                                maxLinearError/sqrt(maxLinearLink->transVariance()),
                                                                                _optimizationMaxError);
                                                                if(_optimizationMaxError > 0.0f && maxLinearErrorRatio > _optimizationMaxError)
                                                                {
                                                                        UWARN("Rejecting localization (%d <-> %d) in this "
                                                                                        "iteration because a wrong loop closure has been "
                                                                                        "detected after graph optimization, resulting in "
                                                                                        "a maximum graph error ratio of %f (edge %d->%d, type=%d, abs error=%f m, stddev=%f). The "
                                                                                        "maximum error ratio parameter \"%s\" is %f of std deviation.",
                                                                                        localizationLinks.rbegin()->second.from(),
                                                                                        localizationLinks.rbegin()->second.to(),
                                                                                        maxLinearErrorRatio,
                                                                                        maxLinearLink->from(),
                                                                                        maxLinearLink->to(),
                                                                                        maxLinearLink->type(),
                                                                                        maxLinearError,
                                                                                        sqrt(maxLinearLink->transVariance()),
                                                                                        Parameters::kRGBDOptimizeMaxError().c_str(),
                                                                                        _optimizationMaxError);
                                                                        rejectLocalization = true;
                                                                }
                                                                else if(_optimizationMaxError == 0.0f && maxLinearErrorRatio>100 && !_graphOptimizer->isRobust())
                                                                {
                                                                        UERROR("Huge optimization error detected!"
                                                                                        "Linear error ratio of %f (edge %d->%d, type=%d, abs error=%f m, stddev=%f). You may consider "
                                                                                        "enabling \"%s\" to reject those bad optimizations by setting it to a non null value!",
                                                                                        maxLinearErrorRatio,
                                                                                        maxLinearLink->from(),
                                                                                        maxLinearLink->to(),
                                                                                        maxLinearLink->type(),
                                                                                        maxLinearError,
                                                                                        sqrt(maxLinearLink->transVariance()),
                                                                                        Parameters::kRGBDOptimizeMaxError().c_str());
                                                                }
                                                        }
                                                        if(maxAngularLink)
                                                        {
                                                                UINFO("Max optimization angular error = %f deg (link %d->%d, var=%f, ratio error/std=%f, thr=%f)",
                                                                                maxAngularError*180.0f/CV_PI,
                                                                                maxAngularLink->from(),
                                                                                maxAngularLink->to(),
                                                                                maxAngularLink->rotVariance(),
                                                                                maxAngularError/sqrt(maxAngularLink->rotVariance()),
                                                                                _optimizationMaxError);
                                                                if(_optimizationMaxError > 0.0f && maxAngularErrorRatio > _optimizationMaxError)
                                                                {
                                                                        UWARN("Rejecting localization (%d <-> %d) in this "
                                                                                        "iteration because a wrong loop closure has been "
                                                                                        "detected after graph optimization, resulting in "
                                                                                        "a maximum graph error ratio of %f (edge %d->%d, type=%d, abs error=%f deg, stddev=%f). The "
                                                                                        "maximum error ratio parameter \"%s\" is %f of std deviation.",
                                                                                        localizationLinks.rbegin()->second.from(),
                                                                                        localizationLinks.rbegin()->second.to(),
                                                                                        maxAngularErrorRatio,
                                                                                        maxAngularLink->from(),
                                                                                        maxAngularLink->to(),
                                                                                        maxAngularLink->type(),
                                                                                        maxAngularError*180.0f/CV_PI,
                                                                                        sqrt(maxAngularLink->rotVariance()),
                                                                                        Parameters::kRGBDOptimizeMaxError().c_str(),
                                                                                        _optimizationMaxError);
                                                                        rejectLocalization = true;
                                                                }
                                                                else if(_optimizationMaxError == 0.0f && maxAngularErrorRatio>100 && !_graphOptimizer->isRobust())
                                                                {
                                                                        UERROR("Huge optimization error detected!"
                                                                                        "Angular error ratio of %f (edge %d->%d, type=%d, abs error=%f m, stddev=%f). You may consider "
                                                                                        "enabling \"%s\" to reject those bad optimizations by setting it to a non null value!",
                                                                                        maxAngularErrorRatio,
                                                                                        maxAngularLink->from(),
                                                                                        maxAngularLink->to(),
                                                                                        maxAngularLink->type(),
                                                                                        maxAngularError*180.0f/CV_PI,
                                                                                        sqrt(maxAngularLink->rotVariance()),
                                                                                        Parameters::kRGBDOptimizeMaxError().c_str());
                                                                }
                                                        }
                                                }
                                        }
                                }
 
                                if(!rejectLocalization)
                                {
                                        if(hasGlobalLoopClosuresOrLandmarks)
                                        {
                                                // We successfully optimize the graph without local loop closures,
                                                // clear them as some of them may be wrong.
                                                size_t before = _odomCacheConstraints.size();
                                                _odomCacheConstraints = graph::filterLinks(_odomCacheConstraints, Link::kLocalSpaceClosure);
                                                if(before != _odomCacheConstraints.size())
                                                {
                                                        UWARN("Successfully optimized without local loop closures! Clear them from local odometry cache. %ld/%ld have been removed.",
                                                                        before - _odomCacheConstraints.size(), before);
                                                }
                                                else
                                                {
                                                        UWARN("Successfully optimized without local loop closures!");
                                                }
                                        }
 
                                        // Count how many localization links are in the constraints
                                        bool hadAlreadyLocalizationLinks = false;
                                        for(std::multimap<int, Link>::iterator iter=_odomCacheConstraints.begin();
                                                        iter!=_odomCacheConstraints.end(); ++iter)
                                        {
                                                if(iter->second.type() == Link::kGlobalClosure ||
                                                   iter->second.type() == Link::kLocalSpaceClosure ||
                                                   iter->second.type() == Link::kLocalTimeClosure ||
                                                   iter->second.type() == Link::kUserClosure ||
                                                   iter->second.type() == Link::kNeighborMerged ||
                                                   iter->second.type() == Link::kLandmark)
                                                {
                                                        hadAlreadyLocalizationLinks = true;
                                                        break;
                                                }
                                        }
 
                                        // update localization links
                                        UASSERT(uContains(optPoses, signature->id()));
                                        Transform newOptPoseInv = optPoses.at(signature->id()).inverse();
                                        for(std::multimap<int, Link>::iterator iter=localizationLinks.begin(); iter!=localizationLinks.end(); ++iter)
                                        {
                                                if(!_localizationSmoothing)
                                                {
                                                        // Add original link without optimization
                                                        UDEBUG("Adding new odom cache constraint %d->%d (%s)", 
                                                                iter->second.from(), iter->second.to(), iter->second.transform().prettyPrint().c_str());
                                                }
                                                else
                                                {
                                                        // Adjust with optimized poses, this will smooth the localization
                                                        UASSERT(uContains(optPoses, iter->first));
                                                        Transform newT = newOptPoseInv * optPoses.at(iter->first);
                                                        UDEBUG("Adjusted localization link %d->%d after optimization", iter->second.from(), iter->second.to());
                                                        UDEBUG("from %s", iter->second.transform().prettyPrint().c_str());
                                                        UDEBUG("  to %s", newT.prettyPrint().c_str());
                                                        iter->second.setTransform(newT);
 
                                                        // Update link in the referred signatures
                                                        if(iter->first > 0)
                                                                _memory->updateLink(iter->second, false);
                                                }
                                                
                                                _odomCacheConstraints.insert(std::make_pair(signature->id(), iter->second));
                                        }
 
                                        _odomCacheConstraints.insert(selfLinks.begin(), selfLinks.end());
 
                                        // At least 2 localizations at 2 different time required
                                        if(hadAlreadyLocalizationLinks || _maxOdomCacheSize == 0)
                                        {
                                                UINFO("Update localization");
                                                if(_optimizeFromGraphEnd)
                                                {
                                                        // update all previous nodes
                                                        // Normally _mapCorrection should be identity, but if _optimizeFromGraphEnd
                                                        // parameters just changed state, we should put back all poses without map correction.
                                                        Transform oldPose = _optimizedPoses.at(localizationLinks.rbegin()->first);
                                                        Transform mapCorrectionInv = _mapCorrection.inverse();
                                                        Transform u = signature->getPose() * localizationLinks.rbegin()->second.transform();
                                                        if(_graphOptimizer->gravitySigma() > 0)
                                                        {
                                // Adjust transform with gravity
                                Transform transform = localizationLinks.rbegin()->second.transform();
                                int loopId = localizationLinks.rbegin()->first;
                                int landmarkId = 0;
                                if(loopId<0)
                                {
                                    //For landmarks, use transform against other node looking the landmark
                                    // (because we don't assume that landmarks are aligned with gravity)
                                    landmarkId = loopId;
                                    UASSERT(landmarksDetected.find(landmarkId) != landmarksDetected.end() &&
                                            !landmarksDetected.at(landmarkId).empty());
                                    loopId = *landmarksDetected.at(landmarkId).begin();
                                }
 
                                const Signature * loopS = _memory->getSignature(loopId);
                                UASSERT(loopS !=0);
                                std::multimap<int, Link>::const_iterator iterGravityLoop = graph::findLink(loopS->getLinks(), loopS->id(), loopS->id(), false, Link::kGravity);
                                std::multimap<int, Link>::const_iterator iterGravitySign = graph::findLink(signature->getLinks(), signature->id(), signature->id(), false, Link::kGravity);
                                if(iterGravityLoop!=loopS->getLinks().end() &&
                                   iterGravitySign!=signature->getLinks().end())
                                {
                                    float roll,pitch,yaw;
                                    if(landmarkId < 0)
                                    {
                                        iterGravityLoop->second.transform().getEulerAngles(roll, pitch, yaw);
                                        Transform gravityCorr = Transform(_optimizedPoses.at(loopS->id()).x(),
                                                                              _optimizedPoses.at(loopS->id()).y(),
                                                                              _optimizedPoses.at(loopS->id()).z(),
                                                                              roll, pitch, _optimizedPoses.at(loopS->id()).theta()) * _optimizedPoses.at(loopS->id()).inverse();
                                        (gravityCorr * _optimizedPoses.at(landmarkId)).getEulerAngles(roll,pitch,yaw);
                                    }
                                    else
                                    {
                                        iterGravityLoop->second.transform().getEulerAngles(roll, pitch, yaw);
                                    }
                                    Transform targetRotation = iterGravitySign->second.transform().rotation()*transform.rotation();
                                    targetRotation = Transform(0,0,0,roll,pitch,targetRotation.theta());
                                    Transform error = transform.rotation().inverse() * iterGravitySign->second.transform().rotation().inverse() * targetRotation;
                                    transform *= error;
                                    u  = signature->getPose() * transform;
                                }
                                else if(iterGravityLoop!=loopS->getLinks().end() ||
                                        iterGravitySign!=signature->getLinks().end())
                                {
                                    UWARN("Gravity link not found for %d or %d, localization won't be corrected with gravity.", loopId, signature->id());
                                }
                                                        }
                                                        Transform up = u * oldPose.inverse();
                                                        if(_graphOptimizer->isSlam2d())
                                                        {
                                                                // in case of 3d landmarks, transform constraint to 2D
                                                                up.to3DoF();
                                                        }
                                                        for(std::map<int, Transform>::iterator iter=_optimizedPoses.begin(); iter!=_optimizedPoses.end(); ++iter)
                                                        {
                                                                iter->second = mapCorrectionInv * up * iter->second;
                                                        }
                                                        _optimizedPoses.at(signature->id()) = signature->getPose();
                                                }
                                                else
                                                {
                                                        Transform newPose = _optimizedPoses.at(localizationLinks.rbegin()->first) * localizationLinks.rbegin()->second.transform().inverse();
                                                        UDEBUG("newPose=%s", newPose.prettyPrint().c_str());
                                                        if(_graphOptimizer->isSlam2d() && signature->getPose().is3DoF())
                                                        {
                                                                // in case of 3d landmarks, transform constraint to 2D
                                                                newPose = newPose.to3DoF();
                                                                UDEBUG("newPose 2D=%s", newPose.prettyPrint().c_str());
                                                        }
                                                        else if(_graphOptimizer->gravitySigma() > 0)
                                                        {
                                                                // Adjust transform with gravity
                                                                std::multimap<int, Link>::const_iterator iterGravitySign = graph::findLink(signature->getLinks(), signature->id(), signature->id(), false, Link::kGravity);
                                                                if(iterGravitySign!=signature->getLinks().end())
                                                                {
                                    Transform transform = localizationLinks.rbegin()->second.transform();
                                                                        float roll,pitch,yaw;
                                                                        float tmp1,tmp2;
                                                                        UDEBUG("Gravity link = %s", iterGravitySign->second.transform().prettyPrint().c_str());
                                    _optimizedPoses.at(localizationLinks.rbegin()->first).getEulerAngles(roll, pitch, yaw);
                                    Transform targetRotation = iterGravitySign->second.transform().rotation()*transform.rotation();
                                    targetRotation = Transform(0,0,0,roll,pitch,targetRotation.theta());
                                    Transform error = transform.rotation().inverse() * iterGravitySign->second.transform().rotation().inverse() * targetRotation;
                                    transform *= error;
                                    newPose = _optimizedPoses.at(localizationLinks.rbegin()->first) * transform.inverse();
                                    iterGravitySign->second.transform().getEulerAngles(roll, pitch, tmp1);
                                    newPose.getEulerAngles(tmp1, tmp2, yaw);
                                    newPose = Transform(newPose.x(), newPose.y(), newPose.z(), roll, pitch, yaw);
                                                                        UDEBUG("newPose gravity=%s", newPose.prettyPrint().c_str());
                                                                }
                                                                else if(iterGravitySign!=signature->getLinks().end())
                                                                {
                                                                        UWARN("Gravity link not found for %d, localization won't be corrected with gravity.", signature->id());
                                                                }
                                                        }
                                                        _optimizedPoses.at(signature->id()) = newPose;
                                                }
                                                _localizationCovariance = locOptCovariance.empty()?localizationLinks.rbegin()->second.infMatrix().inv():locOptCovariance;
                                        }
                                        else //delayed localization (wait for more than 1 link)
                                        {
                                                UWARN("Localization was good, but waiting for another one to be more accurate (%s>0)", Parameters::kRGBDMaxOdomCacheSize().c_str());
                                                delayedLocalization = true;
                                                rejectLocalization = true;
                                        }
                                }
                        }
 
                        if(rejectLocalization)
                        {
                                _loopClosureHypothesis.first = 0;
                                lastProximitySpaceClosureId = 0;
                                rejectedGlobalLoopClosure = true;
                                rejectedLandmark = true;
                        }
                }
                else
                {
                        UINFO("Update map correction");
                        std::map<int, Transform> poses = _optimizedPoses;
 
                        // if _optimizeFromGraphEnd parameter just changed state, don't use optimized poses as guess
                        if(_optimizeFromGraphEndChanged)
                        {
                                UWARN("Optimization: clearing guess poses as %s has changed state, now %s",
                                                Parameters::kRGBDOptimizeFromGraphEnd().c_str(), _optimizeFromGraphEnd?"true":"false");
                                poses.clear();
                                _optimizeFromGraphEndChanged = false;
                        }
 
                        std::multimap<int, Link> constraints;
                        cv::Mat covariance;
                        optimizeCurrentMap(signature->id(), false, poses, covariance, &constraints, &optimizationError, &optimizationIterations);
 
                        // Check added loop closures have broken the graph
                        // (in case of wrong loop closures).
                        bool updateConstraints = true;
                        if(poses.empty())
                        {
                                UWARN("Graph optimization failed! Rejecting last loop closures added.");
                                for(std::list<std::pair<int, int> >::iterator iter=loopClosureLinksAdded.begin(); iter!=loopClosureLinksAdded.end(); ++iter)
                                {
                                        _memory->removeLink(iter->first, iter->second);
                                        UWARN("Loop closure %d->%d rejected!", iter->first, iter->second);
                                }
                                updateConstraints = false;
                                _loopClosureHypothesis.first = 0;
                                lastProximitySpaceClosureId = 0;
                                rejectedGlobalLoopClosure = true;
                                rejectedLandmark = true;
                        }
                        else if(_memory->isIncremental() &&
                          loopClosureLinksAdded.size() &&
                          optimizationIterations > 0 &&
                          constraints.size())
                        {
                                UINFO("Compute max graph errors...");
                                const Link * maxLinearLink = 0;
                                const Link * maxAngularLink = 0;
                                graph::computeMaxGraphErrors(
                                                poses,
                                                constraints,
                                                maxLinearErrorRatio,
                                                maxAngularErrorRatio,
                                                maxLinearError,
                                                maxAngularError,
                                                &maxLinearLink,
                                                &maxAngularLink);
                                if(maxLinearLink == 0 && maxAngularLink==0)
                                {
                                        UWARN("Could not compute graph errors! Wrong loop closures could be accepted!");
                                }
 
                                bool reject = false;
                                if(maxLinearLink)
                                {
                                        UINFO("Max optimization linear error = %f m (link %d->%d, var=%f, ratio error/std=%f)", maxLinearError, maxLinearLink->from(), maxLinearLink->to(), maxLinearLink->transVariance(), maxLinearError/sqrt(maxLinearLink->transVariance()));
                                        if(_optimizationMaxError > 0.0f && maxLinearErrorRatio > _optimizationMaxError)
                                        {
                                                UWARN("Rejecting all added loop closures (%d, first is %d <-> %d) in this "
                                                          "iteration because a wrong loop closure has been "
                                                          "detected after graph optimization, resulting in "
                                                          "a maximum graph error ratio of %f (edge %d->%d, type=%d, abs error=%f m, stddev=%f). The "
                                                          "maximum error ratio parameter \"%s\" is %f of std deviation.",
                                                          (int)loopClosureLinksAdded.size(),
                                                          loopClosureLinksAdded.front().first,
                                                          loopClosureLinksAdded.front().second,
                                                          maxLinearErrorRatio,
                                                          maxLinearLink->from(),
                                                          maxLinearLink->to(),
                                                          maxLinearLink->type(),
                                                          maxLinearError,
                                                          sqrt(maxLinearLink->transVariance()),
                                                          Parameters::kRGBDOptimizeMaxError().c_str(),
                                                          _optimizationMaxError);
                                                reject = true;
                                        }
                                        else if(_optimizationMaxError == 0.0f && maxLinearErrorRatio>100 && !_graphOptimizer->isRobust())
                                        {
                                                UERROR("Huge optimization error detected!"
                                                                "Linear error ratio of %f (edge %d->%d, type=%d, abs error=%f m, stddev=%f). You may consider "
                                                                "enabling \"%s\" to reject those bad optimizations by setting it to a non null value!",
                                                                maxLinearErrorRatio,
                                                                maxLinearLink->from(),
                                                                maxLinearLink->to(),
                                                                maxLinearLink->type(),
                                                                maxLinearError,
                                                                sqrt(maxLinearLink->transVariance()),
                                                                Parameters::kRGBDOptimizeMaxError().c_str());
                                        }
                                }
                                if(maxAngularLink)
                                {
                                        UINFO("Max optimization angular error = %f deg (link %d->%d, var=%f, ratio error/std=%f)", maxAngularError*180.0f/CV_PI, maxAngularLink->from(), maxAngularLink->to(), maxAngularLink->rotVariance(), maxAngularError/sqrt(maxAngularLink->rotVariance()));
                                        if(_optimizationMaxError > 0.0f && maxAngularErrorRatio > _optimizationMaxError)
                                        {
                                                UWARN("Rejecting all added loop closures (%d, first is %d <-> %d) in this "
                                                          "iteration because a wrong loop closure has been "
                                                          "detected after graph optimization, resulting in "
                                                          "a maximum graph error ratio of %f (edge %d->%d, type=%d, abs error=%f deg, stddev=%f). The "
                                                          "maximum error ratio parameter \"%s\" is %f of std deviation.",
                                                          (int)loopClosureLinksAdded.size(),
                                                          loopClosureLinksAdded.front().first,
                                                          loopClosureLinksAdded.front().second,
                                                          maxAngularErrorRatio,
                                                          maxAngularLink->from(),
                                                          maxAngularLink->to(),
                                                          maxAngularLink->type(),
                                                          maxAngularError*180.0f/CV_PI,
                                                          sqrt(maxAngularLink->rotVariance()),
                                                          Parameters::kRGBDOptimizeMaxError().c_str(),
                                                          _optimizationMaxError);
                                                reject = true;
                                        }
                                        else if(_optimizationMaxError == 0.0f && maxAngularErrorRatio>100 && !_graphOptimizer->isRobust())
                                        {
                                                UERROR("Huge optimization error detected!"
                                                                "Angular error ratio of %f (edge %d->%d, type=%d, abs error=%f m, stddev=%f). You may consider "
                                                                "enabling \"%s\" to reject those bad optimizations by setting it to a non null value!",
                                                                maxAngularErrorRatio,
                                                                maxAngularLink->from(),
                                                                maxAngularLink->to(),
                                                                maxAngularLink->type(),
                                                                maxAngularError*180.0f/CV_PI,
                                                                sqrt(maxAngularLink->rotVariance()),
                                                                Parameters::kRGBDOptimizeMaxError().c_str());
                                        }
                                }
 
                                if(reject)
                                {
                                        for(std::list<std::pair<int, int> >::iterator iter=loopClosureLinksAdded.begin(); iter!=loopClosureLinksAdded.end(); ++iter)
                                        {
                                                _memory->removeLink(iter->first, iter->second);
                                                UWARN("Loop closure %d->%d rejected!", iter->first, iter->second);
                                        }
                                        updateConstraints = false;
                                        _loopClosureHypothesis.first = 0;
                                        lastProximitySpaceClosureId = 0;
                                        rejectedGlobalLoopClosure = true;
                                        rejectedLandmark = true;
                                }
                        }
 
                        if(updateConstraints)
                        {
                                UINFO("Updated local map (old size=%d, new size=%d)", (int)_optimizedPoses.size(), (int)poses.size());
                                _optimizedPoses = poses;
                                _constraints = constraints;
                                _localizationCovariance = covariance;
                        }
                }
 
                // Update map correction, it should be identify when optimizing from the last node
                UASSERT(_optimizedPoses.find(signature->id()) != _optimizedPoses.end());
                if(fakeOdom && _mapCorrectionBackup.isNull())
                {
                        _mapCorrectionBackup = _mapCorrection;
                }
                previousMapCorrection = _mapCorrection;
                _mapCorrection = _optimizedPoses.at(signature->id()) * signature->getPose().inverse();
                // Update statistics about the closest node in the graph using the actual loop closure
                if(!_memory->isIncremental() && !_lastLocalizationPose.isNull())
                {
                        int closestNode = _loopClosureHypothesis.first>0?_loopClosureHypothesis.first:lastProximitySpaceClosureId;
                        if(closestNode>0)
                        {
                                distanceToClosestNodeInTheGraph = _lastLocalizationPose.getDistance(_optimizedPoses.at(closestNode));
                                UDEBUG("Last localization pose = %s, updated closest node=%d (%f m)", _lastLocalizationPose.prettyPrint().c_str(), closestNode, distanceToClosestNodeInTheGraph);
                                angleToClosestNodeInTheGraph = (_lastLocalizationPose.inverse() * _optimizedPoses.at(closestNode)).getAngle();
                        }
                }
                _lastLocalizationPose = _optimizedPoses.at(signature->id()); // update
                if(_mapCorrection.getNormSquared() > 0.1f && _optimizeFromGraphEnd)
                {
                        bool hasPrior = signature->hasLink(signature->id());
                        if(!_graphOptimizer->priorsIgnored())
                        {
                                for(std::multimap<int, Link>::reverse_iterator iter=_constraints.rbegin(); !hasPrior && iter!=_constraints.rend(); ++iter)
                                {
                                        if(iter->second.type() == Link::kPosePrior)
                                        {
                                                hasPrior = true;
                                        }
                                }
                        }
                        if((!hasPrior || _graphOptimizer->priorsIgnored()) && _graphOptimizer->gravitySigma()==0.0f)
                        {
                                UERROR("Map correction should be identity when optimizing from the last node. T=%s", _mapCorrection.prettyPrint().c_str());
                        }
                }
        }
        int newLocId = _loopClosureHypothesis.first>0?_loopClosureHypothesis.first:lastProximitySpaceClosureId>0?lastProximitySpaceClosureId:0;
        _lastLocalizationNodeId = newLocId!=0?newLocId:_lastLocalizationNodeId;
        if(newLocId==0 && !landmarksDetected.empty())
        {
                std::map<int, std::set<int> >::const_iterator iter = _memory->getLandmarksIndex().find(landmarksDetected.begin()->first);
                if(iter!=_memory->getLandmarksIndex().end())
                {
                        if(iter->second.size() && *iter->second.begin()!=signature->id())
                        {
                                _lastLocalizationNodeId = *iter->second.begin();
                        }
                }
        }
 
        timeMapOptimization = timer.ticks();
        ULOGGER_INFO("timeMapOptimization=%fs", timeMapOptimization);
 
        //============================================================
        // Prepare statistics
        //============================================================
        // Data used for the statistics event and for the log files
        int dictionarySize = 0;
        int refWordsCount = 0;
        int refUniqueWordsCount = 0;
        int lcHypothesisReactivated = 0;
        float rehearsalValue = uValue(statistics_.data(), Statistics::kMemoryRehearsal_sim(), 0.0f);
        int rehearsalMaxId = (int)uValue(statistics_.data(), Statistics::kMemoryRehearsal_merged(), 0.0f);
        sLoop = _memory->getSignature(_loopClosureHypothesis.first?_loopClosureHypothesis.first:lastProximitySpaceClosureId?lastProximitySpaceClosureId:_highestHypothesis.first);
        if(sLoop)
        {
                lcHypothesisReactivated = sLoop->isSaved()?1.0f:0.0f;
        }
        dictionarySize = (int)_memory->getVWDictionary()->getVisualWords().size();
        refWordsCount = (int)signature->getWords().size();
        refUniqueWordsCount = (int)uUniqueKeys(signature->getWords()).size();
 
        if(_graphOptimizer->isSlam2d() && _localizationCovariance.total() == 36)
        {
                // set very small
                _localizationCovariance.at<double>(2,2) = Registration::COVARIANCE_LINEAR_EPSILON;
                _localizationCovariance.at<double>(3,3) = Registration::COVARIANCE_ANGULAR_EPSILON;
                _localizationCovariance.at<double>(4,4) = Registration::COVARIANCE_ANGULAR_EPSILON;
        }
 
        // Posterior is empty if a bad signature is detected
        float vpHypothesis = posterior.size()?posterior.at(Memory::kIdVirtual):0.0f;
        int loopId = _loopClosureHypothesis.first>0?_loopClosureHypothesis.first:lastProximitySpaceClosureId;
 
        // prepare statistics
        if(_loopClosureHypothesis.first || _publishStats)
        {
                ULOGGER_INFO("sending stats...");
                statistics_.setRefImageId(_memory->getLastSignatureId()); // Use last id from Memory (in case of rehearsal)
                statistics_.setRefImageMapId(signature->mapId());
                statistics_.setStamp(data.stamp());
                if(_loopClosureHypothesis.first != Memory::kIdInvalid)
                {
                        statistics_.setLoopClosureId(_loopClosureHypothesis.first);
                        statistics_.setLoopClosureMapId(_memory->getMapId(_loopClosureHypothesis.first));
                        ULOGGER_INFO("Loop closure detected! With id=%d", _loopClosureHypothesis.first);
                }
 
                if(_publishStats)
                {
                        ULOGGER_INFO("send all stats...");
                        statistics_.setExtended(1);
 
                        statistics_.addStatistic(Statistics::kLoopAccepted_hypothesis_id(), _loopClosureHypothesis.first);
                        statistics_.addStatistic(Statistics::kLoopSuppressed_hypothesis_id(), loopIdSuppressedByProximity);
                        statistics_.addStatistic(Statistics::kLoopHighest_hypothesis_id(), _highestHypothesis.first);
                        statistics_.addStatistic(Statistics::kLoopHighest_hypothesis_value(), _highestHypothesis.second);
                        statistics_.addStatistic(Statistics::kLoopHypothesis_reactivated(), lcHypothesisReactivated);
                        statistics_.addStatistic(Statistics::kLoopVp_hypothesis(), vpHypothesis);
                        statistics_.addStatistic(Statistics::kLoopReactivate_id(), retrievalId);
                        statistics_.addStatistic(Statistics::kLoopHypothesis_ratio(), hypothesisRatio);
                        statistics_.addStatistic(Statistics::kLoopVisual_inliers(), loopClosureVisualInliers);
                        statistics_.addStatistic(Statistics::kLoopVisual_inliers_ratio(), loopClosureVisualInliersRatio);
                        statistics_.addStatistic(Statistics::kLoopVisual_matches(), loopClosureVisualMatches);
                        statistics_.addStatistic(Statistics::kLoopLinear_variance(), loopClosureLinearVariance);
                        statistics_.addStatistic(Statistics::kLoopAngular_variance(), loopClosureAngularVariance);
                        statistics_.addStatistic(Statistics::kLoopLast_id(), _memory->getLastGlobalLoopClosureId());
                        statistics_.addStatistic(Statistics::kLoopOptimization_max_error(), maxLinearError);
                        statistics_.addStatistic(Statistics::kLoopOptimization_max_error_ratio(), maxLinearErrorRatio);
                        statistics_.addStatistic(Statistics::kLoopOptimization_max_ang_error(), maxAngularError*180.0f/M_PI);
                        statistics_.addStatistic(Statistics::kLoopOptimization_max_ang_error_ratio(), maxAngularErrorRatio);
                        statistics_.addStatistic(Statistics::kLoopOptimization_error(), optimizationError);
                        statistics_.addStatistic(Statistics::kLoopOptimization_iterations(), optimizationIterations);
                        statistics_.addStatistic(Statistics::kLoopLandmark_detected(), landmarksDetected.empty()?0:-landmarksDetected.begin()->first);
                        statistics_.addStatistic(Statistics::kLoopLandmark_detected_node_ref(), landmarksDetected.empty() || landmarksDetected.begin()->second.empty()?0:*landmarksDetected.begin()->second.begin());
                        statistics_.addStatistic(Statistics::kLoopVisual_inliers_mean_dist(), loopClosureVisualInliersMeanDist);
                        statistics_.addStatistic(Statistics::kLoopVisual_inliers_distribution(), loopClosureVisualInliersDistribution);
 
                        statistics_.addStatistic(Statistics::kProximityTime_detections(), proximityDetectionsInTimeFound);
                        statistics_.addStatistic(Statistics::kProximitySpace_detections_added_visually(), proximityDetectionsAddedVisually);
                        statistics_.addStatistic(Statistics::kProximitySpace_detections_added_icp_multi(), proximityDetectionsAddedByICPMulti);
                        statistics_.addStatistic(Statistics::kProximitySpace_detections_added_icp_global(), proximityDetectionsAddedByICPGlobal);
                        statistics_.addStatistic(Statistics::kProximitySpace_paths(), proximitySpacePaths);
                        statistics_.addStatistic(Statistics::kProximitySpace_visual_paths_checked(), localVisualPathsChecked);
                        statistics_.addStatistic(Statistics::kProximitySpace_scan_paths_checked(), localScanPathsChecked);
                        statistics_.addStatistic(Statistics::kProximitySpace_last_detection_id(), lastProximitySpaceClosureId);
                        statistics_.setProximityDetectionId(lastProximitySpaceClosureId);
                        statistics_.setProximityDetectionMapId(_memory->getMapId(lastProximitySpaceClosureId));
 
                        statistics_.addStatistic(Statistics::kLoopId(), loopId);
                        statistics_.addStatistic(Statistics::kLoopMap_id(), (loopId>0 && sLoop)?sLoop->mapId():-1);
 
                        statistics_.addStatistic(Statistics::kLoopDistance_since_last_loc(), _distanceTravelledSinceLastLocalization);
 
                        float x,y,z,roll,pitch,yaw;
                        if(_loopClosureHypothesis.first || lastProximitySpaceClosureId || (!rejectedLandmark && !landmarksDetected.empty()))
                        {
                                if(_loopClosureHypothesis.first || lastProximitySpaceClosureId)
                                {
                                        // Loop closure transform
                                        UASSERT(sLoop);
                                        std::multimap<int, Link>::const_iterator loopIter =  sLoop->getLinks().find(signature->id());
                                        UASSERT(loopIter!=sLoop->getLinks().end());
                                        UINFO("Set loop closure transform = %s", loopIter->second.transform().prettyPrint().c_str());
                                        statistics_.setLoopClosureTransform(loopIter->second.transform());
 
                                        statistics_.addStatistic(Statistics::kLoopVisual_words(), sLoop->getWords().size());
 
                                        // if ground truth exists, compute localization error
                                        if(!sLoop->getGroundTruthPose().isNull() && !signature->getGroundTruthPose().isNull())
                                        {
                                                Transform transformGT = sLoop->getGroundTruthPose().inverse() * signature->getGroundTruthPose();
                                                Transform error = loopIter->second.transform().inverse() * transformGT;
                                                statistics_.addStatistic(Statistics::kGtLocalization_linear_error(), error.getNorm());
                                                statistics_.addStatistic(Statistics::kGtLocalization_angular_error(), error.getAngle(1,0,0)*180/M_PI);
                                        }
                                }
 
                                _distanceTravelledSinceLastLocalization = 0.0f;
 
                                statistics_.addStatistic(Statistics::kLoopMapToOdom_norm(), _mapCorrection.getNorm());
                                statistics_.addStatistic(Statistics::kLoopMapToOdom_angle(), _mapCorrection.getAngle()*180.0f/M_PI);
                                _mapCorrection.getTranslationAndEulerAngles(x, y, z, roll, pitch, yaw);
                                statistics_.addStatistic(Statistics::kLoopMapToOdom_x(), x);
                                statistics_.addStatistic(Statistics::kLoopMapToOdom_y(), y);
                                statistics_.addStatistic(Statistics::kLoopMapToOdom_z(), z);
                                statistics_.addStatistic(Statistics::kLoopMapToOdom_roll(),  roll*180.0f/M_PI);
                                statistics_.addStatistic(Statistics::kLoopMapToOdom_pitch(),  pitch*180.0f/M_PI);
                                statistics_.addStatistic(Statistics::kLoopMapToOdom_yaw(), yaw*180.0f/M_PI);
 
                                // Odom correction (actual odometry pose change), ignore correction from first localization
                                if(!odomPose.isNull() && !previousMapCorrection.isNull() && !previousMapCorrection.isIdentity())
                                {
                                        Transform odomCorrection = (previousMapCorrection*odomPose).inverse()*_mapCorrection*odomPose;
                                        statistics_.addStatistic(Statistics::kLoopOdom_correction_norm(), odomCorrection.getNorm());
                                        statistics_.addStatistic(Statistics::kLoopOdom_correction_angle(), odomCorrection.getAngle()*180.0f/M_PI);
                                        odomCorrection.getTranslationAndEulerAngles(x, y, z, roll, pitch, yaw);
                                        statistics_.addStatistic(Statistics::kLoopOdom_correction_x(), x);
                                        statistics_.addStatistic(Statistics::kLoopOdom_correction_y(), y);
                                        statistics_.addStatistic(Statistics::kLoopOdom_correction_z(), z);
                                        statistics_.addStatistic(Statistics::kLoopOdom_correction_roll(),  roll*180.0f/M_PI);
                                        statistics_.addStatistic(Statistics::kLoopOdom_correction_pitch(),  pitch*180.0f/M_PI);
                                        statistics_.addStatistic(Statistics::kLoopOdom_correction_yaw(), yaw*180.0f/M_PI);
                                }
                        }
                        if(!_lastLocalizationPose.isNull() && !_lastLocalizationPose.isIdentity())
                        {
                                _lastLocalizationPose.getTranslationAndEulerAngles(x, y, z, roll, pitch, yaw);
                                statistics_.addStatistic(Statistics::kLoopMapToBase_x(), x);
                                statistics_.addStatistic(Statistics::kLoopMapToBase_y(), y);
                                statistics_.addStatistic(Statistics::kLoopMapToBase_z(), z);
                                statistics_.addStatistic(Statistics::kLoopMapToBase_roll(),  roll*180.0f/M_PI);
                                statistics_.addStatistic(Statistics::kLoopMapToBase_pitch(),  pitch*180.0f/M_PI);
                                statistics_.addStatistic(Statistics::kLoopMapToBase_yaw(), yaw*180.0f/M_PI);
                                UINFO("Localization pose = %s", _lastLocalizationPose.prettyPrint().c_str());
 
                                if(_localizationCovariance.total()==36)
                                {
                                        double varLin = _graphOptimizer->isSlam2d()?
                                                        std::max(_localizationCovariance.at<double>(0,0), _localizationCovariance.at<double>(1,1)):
                                                        uMax3(_localizationCovariance.at<double>(0,0), _localizationCovariance.at<double>(1,1), _localizationCovariance.at<double>(2,2));
 
                                        statistics_.addStatistic(Statistics::kLoopMapToBase_lin_std(), sqrt(varLin));
                                        statistics_.addStatistic(Statistics::kLoopMapToBase_lin_var(), varLin);
                                }
                        }
 
                        statistics_.setMapCorrection(_mapCorrection);
                        UINFO("Set map correction = %s", _mapCorrection.prettyPrint().c_str());
                        statistics_.setLocalizationCovariance(_localizationCovariance);
 
                        // timings...
                        statistics_.addStatistic(Statistics::kTimingMemory_update(), timeMemoryUpdate*1000);
                        statistics_.addStatistic(Statistics::kTimingNeighbor_link_refining(), timeNeighborLinkRefining*1000);
                        statistics_.addStatistic(Statistics::kTimingProximity_by_time(), timeProximityByTimeDetection*1000);
                        statistics_.addStatistic(Statistics::kTimingProximity_by_space_search(), timeProximityBySpaceSearch*1000);
                        statistics_.addStatistic(Statistics::kTimingProximity_by_space_visual(), timeProximityBySpaceVisualDetection*1000);
                        statistics_.addStatistic(Statistics::kTimingProximity_by_space(), timeProximityBySpaceDetection*1000);
                        statistics_.addStatistic(Statistics::kTimingReactivation(), timeReactivations*1000);
                        statistics_.addStatistic(Statistics::kTimingAdd_loop_closure_link(), timeAddLoopClosureLink*1000);
                        statistics_.addStatistic(Statistics::kTimingMap_optimization(), timeMapOptimization*1000);
                        statistics_.addStatistic(Statistics::kTimingLikelihood_computation(), timeLikelihoodCalculation*1000);
                        statistics_.addStatistic(Statistics::kTimingPosterior_computation(), timePosteriorCalculation*1000);
                        statistics_.addStatistic(Statistics::kTimingHypotheses_creation(), timeHypothesesCreation*1000);
                        statistics_.addStatistic(Statistics::kTimingHypotheses_validation(), timeHypothesesValidation*1000);
                        statistics_.addStatistic(Statistics::kTimingCleaning_neighbors(), timeCleaningNeighbors*1000);
 
                        // retrieval
                        statistics_.addStatistic(Statistics::kMemorySignatures_retrieved(), (float)signaturesRetrieved.size());
 
                        // Feature specific parameters
                        statistics_.addStatistic(Statistics::kKeypointDictionary_size(), dictionarySize);
                        statistics_.addStatistic(Statistics::kKeypointCurrent_frame(), refWordsCount);
                        statistics_.addStatistic(Statistics::kKeypointIndexed_words(), _memory->getVWDictionary()->getIndexedWordsCount());
                        statistics_.addStatistic(Statistics::kKeypointIndex_memory_usage(), _memory->getVWDictionary()->getIndexMemoryUsed());
 
                        //Epipolar geometry constraint
                        statistics_.addStatistic(Statistics::kLoopRejectedHypothesis(), rejectedGlobalLoopClosure?1.0f:0);
 
                        statistics_.addStatistic(Statistics::kMemorySmall_movement(), smallDisplacement?1.0f:0);
                        statistics_.addStatistic(Statistics::kMemoryDistance_travelled(), _distanceTravelled);
                        statistics_.addStatistic(Statistics::kMemoryFast_movement(), tooFastMovement?1.0f:0);
                        statistics_.addStatistic(Statistics::kMemoryNew_landmark(), addedNewLandmark?1.0f:0);
 
                        if(distanceToClosestNodeInTheGraph>0.0)
                        {
                                statistics_.addStatistic(Statistics::kMemoryClosest_node_distance(), distanceToClosestNodeInTheGraph);
                                statistics_.addStatistic(Statistics::kMemoryClosest_node_angle(), angleToClosestNodeInTheGraph);
                        }
 
                        if(_publishRAMUsage)
                        {
                                UTimer ramTimer;
                                statistics_.addStatistic(Statistics::kMemoryRAM_usage(), UProcessInfo::getMemoryUsage()/(1024*1024));
                                long estimatedMemoryUsage = sizeof(Rtabmap);
                                estimatedMemoryUsage += _optimizedPoses.size() * (sizeof(int) + sizeof(Transform) + 12 * sizeof(float) + sizeof(std::map<int, Transform>::iterator)) + sizeof(std::map<int, Transform>);
                                estimatedMemoryUsage += _constraints.size() * (sizeof(int) + sizeof(Transform) + 12 * sizeof(float) + sizeof(cv::Mat) + 36 * sizeof(double) + sizeof(std::map<int, Link>::iterator)) + sizeof(std::map<int, Link>);
                                estimatedMemoryUsage += _memory->getMemoryUsed();
                                estimatedMemoryUsage += _bayesFilter->getMemoryUsed();
                                estimatedMemoryUsage += _parameters.size()*(sizeof(std::string)*2+sizeof(ParametersMap::iterator)) + sizeof(ParametersMap);
                                statistics_.addStatistic(Statistics::kMemoryRAM_estimated(), (float)(estimatedMemoryUsage/(1024*1024)));//MB
                                statistics_.addStatistic(Statistics::kTimingRAM_estimation(), ramTimer.ticks()*1000);
                        }
 
                        if(_publishLikelihood || _publishPdf)
                        {
                                // Child count by parent signature on the root of the memory ... for statistics
                                statistics_.setWeights(weights);
                                if(_publishPdf)
                                {
                                        statistics_.setPosterior(posterior);
                                }
                                if(_publishLikelihood)
                                {
                                        statistics_.setLikelihood(likelihood);
                                        statistics_.setRawLikelihood(rawLikelihood);
                                }
                        }
 
                        statistics_.setLabels(_memory->getAllLabels());
 
                        // Path
                        if(_path.size())
                        {
                                statistics_.setLocalPath(this->getPathNextNodes());
                                statistics_.setCurrentGoalId(this->getPathCurrentGoalId());
                        }
                }
 
                timeStatsCreation = timer.ticks();
                ULOGGER_INFO("Time creating stats = %f...", timeStatsCreation);
        }
 
        Signature lastSignatureData = *signature;
        Transform lastSignatureLocalizedPose;
        if(_optimizedPoses.find(signature->id()) != _optimizedPoses.end())
        {
                lastSignatureLocalizedPose = _optimizedPoses.at(signature->id());
        }
        if(!_publishLastSignatureData)
        {
                lastSignatureData.sensorData().clearCompressedData();
                lastSignatureData.sensorData().clearRawData();
        }
        if(!_rawDataKept)
        {
                _memory->removeRawData(signature->id(), true, !_neighborLinkRefining && !_proximityBySpace, true);
        }
 
        // Localization mode and saving localization data: save odometry covariance in a prior link
        // so that DBReader can republish the covariance of localization data
        if(!_memory->isIncremental() && _memory->isLocalizationDataSaved() && !odomCovariance.empty())
        {
                _memory->addLink(Link(signature->id(), signature->id(), Link::kPosePrior, odomPose, odomCovariance.inv()));
        }
 
        // remove last signature if the memory is not incremental or is a bad signature (if bad signatures are ignored)
        int signatureRemoved = _memory->cleanup();
        if(signatureRemoved)
        {
                signaturesRemoved.push_back(signatureRemoved);
        }
 
        // If this option activated, add new nodes only if there are linked with a previous map.
        // Used when rtabmap is first started, it will wait a
        // global loop closure detection before starting the new map,
        // otherwise it deletes the current node.
        if(signatureRemoved != lastSignatureData.id())
        {
                if(_startNewMapOnLoopClosure &&
                        _memory->isIncremental() &&              // only in mapping mode
                        graph::filterLinks(signature->getLinks(), Link::kSelfRefLink).size() == 0 &&      // alone in the current map
                        (landmarksDetected.empty() || rejectedLandmark) &&      // if we re not seeing a landmark from a previous map
                        _memory->getWorkingMem().size()>=2)       // The working memory should not be empty (beside virtual signature)
                {
                        UWARN("Ignoring location %d because a global loop closure is required before starting a new map!",
                                        signature->id());
                        signaturesRemoved.push_back(signature->id());
                        _memory->deleteLocation(signature->id());
                }
                else if(_startNewMapOnGoodSignature &&
                                (signature->getLandmarks().empty() && signature->isBadSignature()) &&
                                graph::filterLinks(signature->getLinks(), Link::kSelfRefLink).size() == 0)     // alone in the current map
                {
                        UWARN("Ignoring location %d because a good signature (with enough features or with a landmark detected) is required before starting a new map!",
                                        signature->id());
                        signaturesRemoved.push_back(signature->id());
                        _memory->deleteLocation(signature->id());
                }
                else if((smallDisplacement || tooFastMovement) &&
                                _loopClosureHypothesis.first == 0 &&
                                lastProximitySpaceClosureId == 0 &&
                                (rejectedLandmark || landmarksDetected.empty()) &&
                                !addedNewLandmark)
                {
                        // Don't delete the location if a loop closure is detected
                        UINFO("Ignoring location %d because the displacement is too small! (d=%f a=%f)",
                                  signature->id(), _rgbdLinearUpdate, _rgbdAngularUpdate);
                        // If there is a too small displacement, remove the node
                        signaturesRemoved.push_back(signature->id());
                        _memory->deleteLocation(signature->id());
                }
                else
                {
                        _memory->saveLocationData(signature->id());
                }
        }
        else if(!_memory->isIncremental() &&
                        (smallDisplacement || tooFastMovement) &&
                        _loopClosureHypothesis.first == 0 &&
                        lastProximitySpaceClosureId == 0 &&
                        !delayedLocalization &&
                        (rejectedLandmark || landmarksDetected.empty()))
        {
                _odomCachePoses.erase(signatureRemoved);
                for(std::multimap<int, Link>::iterator iter=_odomCacheConstraints.begin(); iter!=_odomCacheConstraints.end();)
                {
                        if(iter->second.from() == signatureRemoved || iter->second.to() == signatureRemoved)
                        {
                                _odomCacheConstraints.erase(iter++);
                        }
                        else
                        {
                                ++iter;
                        }
                }
        }
 
        // Pass this point signature should not be used, since it could have been transferred...
        signature = 0;
 
        timeMemoryCleanup = timer.ticks();
        ULOGGER_INFO("timeMemoryCleanup = %fs... %d signatures removed", timeMemoryCleanup, (int)signaturesRemoved.size());
 
 
 
        //============================================================
        // TRANSFER
        //============================================================
        // If time allowed for the detection exceeds the limit of
        // real-time, move the oldest signature with less frequency
        // entry (from X oldest) from the short term memory to the
        // long term memory.
        //============================================================
        double totalTime = timerTotal.ticks();
        ULOGGER_INFO("Total time processing = %fs...", totalTime);
        if((_maxTimeAllowed != 0 && totalTime*1000>_maxTimeAllowed) ||
                (_maxMemoryAllowed != 0 && _memory->getWorkingMem().size() > _maxMemoryAllowed))
        {
                ULOGGER_INFO("Removing old signatures because time limit is reached %f>%f or memory is reached %d>%d...", totalTime*1000, _maxTimeAllowed, _memory->getWorkingMem().size(), _maxMemoryAllowed);
                immunizedLocations.insert(_lastLocalizationNodeId); // keep the latest localization in working memory
                std::list<int> transferred = _memory->forget(immunizedLocations);
                signaturesRemoved.insert(signaturesRemoved.end(), transferred.begin(), transferred.end());
                if(!_someNodesHaveBeenTransferred && transferred.size())
                {
                        _someNodesHaveBeenTransferred = true; // only used to hide a warning on close nodes immunization
                }
        }
        _lastProcessTime = totalTime;
 
        // cleanup cached gps values
        for(std::list<int>::iterator iter=signaturesRemoved.begin(); iter!=signaturesRemoved.end() && _gpsGeocentricCache.size(); ++iter)
        {
                _gpsGeocentricCache.erase(*iter);
        }
 
        //Remove optimized poses from signatures transferred
        if(signaturesRemoved.size() && (_optimizedPoses.size() || _constraints.size()))
        {
                //refresh the local map because some transferred nodes may have broken the tree
                int id = 0;
                if(!_memory->isIncremental() && (_lastLocalizationNodeId > 0 || _path.size()))
                {
                        if(_path.size())
                        {
                                // priority on node on the path
                                UASSERT(_pathCurrentIndex < _path.size());
                                UASSERT_MSG(uContains(_optimizedPoses, _path.at(_pathCurrentIndex).first), uFormat("id=%d", _path.at(_pathCurrentIndex).first).c_str());
                                id = _path.at(_pathCurrentIndex).first;
                                UDEBUG("Refresh local map from %d", id);
                        }
                        else
                        {
                                if(uContains(_optimizedPoses, _lastLocalizationNodeId))
                                {
                                        id = _lastLocalizationNodeId;
                                        UDEBUG("Refresh local map from %d", id);
                                }
                                else
                                {
                                        UDEBUG("Clearing _lastLocalizationNodeId(%d)", _lastLocalizationNodeId);
                                        _lastLocalizationNodeId = 0;
                                }
                        }
                }
                else if(_memory->isIncremental() &&
                                _optimizedPoses.size() &&
                                _memory->getLastWorkingSignature())
                {
                        id = _memory->getLastWorkingSignature()->id();
                        UDEBUG("Refresh local map from %d", id);
                }
                UDEBUG("id=%d _optimizedPoses=%d", id, (int)_optimizedPoses.size());
                if(id > 0)
                {
                        if(_lastLocalizationNodeId != 0)
                        {
                                _lastLocalizationNodeId = id;
                        }
                        UASSERT_MSG(_memory->getSignature(id) != 0, uFormat("id=%d", id).c_str());
 
                        if(signaturesRemoved.size() == 1 && signaturesRemoved.front() == lastSignatureData.id())
                        {
                                int lastId = signaturesRemoved.front();
                                UDEBUG("Detected that only last signature has been removed (lastId=%d)", lastId);
                                _optimizedPoses.erase(lastId);
                                for(std::multimap<int, Link>::iterator iter=_constraints.find(lastId); iter!=_constraints.end() && iter->first==lastId;++iter)
                                {
                                        if(iter->second.to() != iter->second.from())
                                        {
                                                std::multimap<int, Link>::iterator jter = graph::findLink(_constraints, iter->second.to(), iter->second.from(), false);
                                                if(jter != _constraints.end())
                                                {
                                                        _constraints.erase(jter);
                                                }
                                        }
                                }
                                _constraints.erase(lastId);
                        }
                        else
                        {
 
                                std::map<int, int> ids = _memory->getNeighborsId(id, 0, 0, true);
                                for(std::map<int, Transform>::iterator iter=_optimizedPoses.begin(); iter!=_optimizedPoses.end();)
                                {
                                        if(iter->first > 0 && !uContains(ids, iter->first))
                                        {
                                                UDEBUG("Removed %d from local map", iter->first);
                                                UASSERT(iter->first != _lastLocalizationNodeId);
                                                _optimizedPoses.erase(iter++);
 
                                                if(!_globalScanMap.empty())
                                                {
                                                        UWARN("optimized poses have been modified, clearing global scan map...");
                                                        _globalScanMap.clear();
                                                        _globalScanMapPoses.clear();
                                                }
                                        }
                                        else
                                        {
                                                ++iter;
                                        }
                                }
                                for(std::multimap<int, Link>::iterator iter=_constraints.begin(); iter!=_constraints.end();)
                                {
                                        if(iter->first > 0 && (!uContains(ids, iter->second.from()) || !uContains(ids, iter->second.to())))
                                        {
                                                _constraints.erase(iter++);
                                        }
                                        else
                                        {
                                                ++iter;
                                        }
                                }
                        }
                }
                else
                {
                        if(!_optimizedPoses.empty())
                                UDEBUG("Optimized poses cleared!");
                        _optimizedPoses.clear();
                        _constraints.clear();
                }
        }
        // just some verifications to make sure that planning path is still in the local map!
        if(_path.size())
        {
                UASSERT(_pathCurrentIndex < _path.size());
                UASSERT(_pathGoalIndex < _path.size());
                UASSERT_MSG(uContains(_optimizedPoses, _path.at(_pathCurrentIndex).first), uFormat("local map size=%d, id=%d", (int)_optimizedPoses.size(), _path.at(_pathCurrentIndex).first).c_str());
                UASSERT_MSG(uContains(_optimizedPoses, _path.at(_pathGoalIndex).first), uFormat("local map size=%d, id=%d", (int)_optimizedPoses.size(), _path.at(_pathGoalIndex).first).c_str());
        }
 
 
        timeRealTimeLimitReachedProcess = timer.ticks();
        ULOGGER_INFO("Time limit reached processing = %f...", timeRealTimeLimitReachedProcess);
 
        //==============================================================
        // Finalize statistics and log files
        //==============================================================
        int localGraphSize = 0;
        if(_publishStats)
        {
                statistics_.addStatistic(Statistics::kTimingStatistics_creation(), timeStatsCreation*1000);
                statistics_.addStatistic(Statistics::kTimingTotal(), totalTime*1000);
                statistics_.addStatistic(Statistics::kTimingForgetting(), timeRealTimeLimitReachedProcess*1000);
                statistics_.addStatistic(Statistics::kTimingJoining_trash(), timeJoiningTrash*1000);
                statistics_.addStatistic(Statistics::kTimingEmptying_trash(), timeEmptyingTrash*1000);
                statistics_.addStatistic(Statistics::kTimingMemory_cleanup(), timeMemoryCleanup*1000);
 
                // Transfer
                statistics_.addStatistic(Statistics::kMemorySignatures_removed(), signaturesRemoved.size());
                statistics_.addStatistic(Statistics::kMemoryImmunized_globally(), immunizedGlobally);
                statistics_.addStatistic(Statistics::kMemoryImmunized_locally(), immunizedLocally);
                statistics_.addStatistic(Statistics::kMemoryImmunized_locally_max(), maxLocalLocationsImmunized);
 
                // place after transfer because the memory/local graph may have changed
                statistics_.addStatistic(Statistics::kMemoryWorking_memory_size(), _memory->getWorkingMem().size());
                statistics_.addStatistic(Statistics::kMemoryShort_time_memory_size(), _memory->getStMem().size());
                statistics_.addStatistic(Statistics::kMemoryDatabase_memory_used(), _memory->getDatabaseMemoryUsed());
 
                // Set local graph
                std::map<int, Transform> poses;
                std::multimap<int, Link> constraints;
                if(!_rgbdSlamMode)
                {
                        UDEBUG("");
                        // no optimization on appearance-only mode, create a local graph
                        std::map<int, int> ids = _memory->getNeighborsId(lastSignatureData.id(), 0, 0, true);
                        _memory->getMetricConstraints(uKeysSet(ids), poses, constraints, false);
                }
                else // RGBD-SLAM mode
                {
                        poses = _optimizedPoses;
                        constraints = _constraints;
                }
                UINFO("Adding data %d [%d] (rgb/left=%d depth/right=%d)", lastSignatureData.id(), lastSignatureData.mapId(), lastSignatureData.sensorData().imageRaw().empty()?0:1, lastSignatureData.sensorData().depthOrRightRaw().empty()?0:1);
                        statistics_.addSignatureData(lastSignatureData);
 
                if(_nodesToRepublish.size())
                {
                        std::multimap<int, int> missingIds;
 
                        // priority to loopId
                        int tmpId = loopId>0?loopId:_highestHypothesis.first;
                        if(tmpId>0 && _nodesToRepublish.find(tmpId) != _nodesToRepublish.end())
                        {
                                missingIds.insert(std::make_pair(-1, tmpId));
                        }
 
                        if(!_lastLocalizationPose.isNull())
                        {
                                // Republish data from closest nodes of the current localization
                                std::map<int, Transform> nodesOnly(_optimizedPoses.lower_bound(1), _optimizedPoses.end());
                                int id = rtabmap::graph::findNearestNode(nodesOnly, _lastLocalizationPose);
                                if(id>0)
                                {
                                        std::map<int, int> ids = _memory->getNeighborsId(id, 0, 0, true, false, true);
                                        for(std::map<int, int>::iterator iter=ids.begin(); iter!=ids.end(); ++iter)
                                        {
                                                if(iter->first != loopId &&
                                                                _nodesToRepublish.find(iter->first) != _nodesToRepublish.end())
                                                {
                                                        missingIds.insert(std::make_pair(iter->second, iter->first));
                                                }
                                        }
 
                                        if(_nodesToRepublish.size() != missingIds.size())
                                        {
                                                // remove requested nodes not anymore in the graph
                                                for(std::set<int>::iterator iter=_nodesToRepublish.begin(); iter!=_nodesToRepublish.end();)
                                                {
                                                        if(ids.find(*iter) == ids.end())
                                                        {
                                                                iter = _nodesToRepublish.erase(iter);
                                                        }
                                                        else
                                                        {
                                                                ++iter;
                                                        }
                                                }
                                        }
                                }
                        }
 
                        int loaded = 0;
                        std::stringstream stream;
                        for(std::multimap<int, int>::iterator iter=missingIds.begin(); iter!=missingIds.end() && loaded<(int)_maxRepublished; ++iter)
                        {
                                statistics_.addSignatureData(getSignatureCopy(iter->second, true, true, true, true, true, true));
                                _nodesToRepublish.erase(iter->second);
                                ++loaded;
                                stream << iter->second << " ";
                        }
                        if(loaded)
                        {
                                UWARN("Republishing data of requested node(s) %s(%s=%d)",
                                                stream.str().c_str(),
                                                Parameters::kRtabmapMaxRepublished().c_str(),
                                                _maxRepublished);
                        }
                }
 
                UDEBUG("");
                localGraphSize = (int)poses.size();
                if(!lastSignatureLocalizedPose.isNull())
                {
                        poses.insert(std::make_pair(lastSignatureData.id(), lastSignatureLocalizedPose)); // in case we are in localization
                }
                statistics_.setPoses(poses);
                statistics_.setConstraints(constraints);
 
                statistics_.addStatistic(Statistics::kMemoryLocal_graph_size(), poses.size());
 
                statistics_.setOdomCachePoses(_odomCachePoses);
                statistics_.setOdomCacheConstraints(_odomCacheConstraints);
                statistics_.addStatistic(Statistics::kMemoryOdom_cache_poses(), _odomCachePoses.size());
                statistics_.addStatistic(Statistics::kMemoryOdom_cache_links(), _odomCacheConstraints.size());
 
                if(_computeRMSE && _memory->getGroundTruths().size())
                {
                        UDEBUG("Computing RMSE...");
                        float translational_rmse = 0.0f;
                        float translational_mean = 0.0f;
                        float translational_median = 0.0f;
                        float translational_std = 0.0f;
                        float translational_min = 0.0f;
                        float translational_max = 0.0f;
                        float rotational_rmse = 0.0f;
                        float rotational_mean = 0.0f;
                        float rotational_median = 0.0f;
                        float rotational_std = 0.0f;
                        float rotational_min = 0.0f;
                        float rotational_max = 0.0f;
 
                        graph::calcRMSE(
                                        _memory->getGroundTruths(),
                                        poses,
                                        translational_rmse,
                                        translational_mean,
                                        translational_median,
                                        translational_std,
                                        translational_min,
                                        translational_max,
                                        rotational_rmse,
                                        rotational_mean,
                                        rotational_median,
                                        rotational_std,
                                        rotational_min,
                                        rotational_max);
 
                        statistics_.addStatistic(Statistics::kGtTranslational_rmse(), translational_rmse);
                        statistics_.addStatistic(Statistics::kGtTranslational_mean(), translational_mean);
                        statistics_.addStatistic(Statistics::kGtTranslational_median(), translational_median);
                        statistics_.addStatistic(Statistics::kGtTranslational_std(), translational_std);
                        statistics_.addStatistic(Statistics::kGtTranslational_min(), translational_min);
                        statistics_.addStatistic(Statistics::kGtTranslational_max(), translational_max);
                        statistics_.addStatistic(Statistics::kGtRotational_rmse(), rotational_rmse);
                        statistics_.addStatistic(Statistics::kGtRotational_mean(), rotational_mean);
                        statistics_.addStatistic(Statistics::kGtRotational_median(), rotational_median);
                        statistics_.addStatistic(Statistics::kGtRotational_std(), rotational_std);
                        statistics_.addStatistic(Statistics::kGtRotational_min(), rotational_min);
                        statistics_.addStatistic(Statistics::kGtRotational_max(), rotational_max);
                        UDEBUG("Computing RMSE...done!");
                }
 
                std::vector<int> ids;
                ids.reserve(_memory->getWorkingMem().size() + _memory->getStMem().size());
                for(std::set<int>::const_iterator iter=_memory->getStMem().begin(); iter!=_memory->getStMem().end(); ++iter)
                {
                        ids.push_back(*iter);
                }
                for(std::map<int, double>::const_iterator iter=_memory->getWorkingMem().lower_bound(0); iter!=_memory->getWorkingMem().end(); ++iter)
                {
                        ids.push_back(iter->first);
                }
                statistics_.setWmState(ids);
                UDEBUG("wmState=%d", (int)ids.size());
        }
 
        //Save statistics to database
        if(_memory->isIncremental() || _memory->isLocalizationDataSaved())
        {
                _memory->saveStatistics(statistics_, _saveWMState);
        }
 
        //Start trashing
        UDEBUG("Empty trash...");
        _memory->emptyTrash();
 
        // Log info...
        // TODO : use a specific class which will handle the RtabmapEvent
        if(_foutFloat && _foutInt)
        {
                UDEBUG("Logging...");
                std::string logF = uFormat("%f %f %f %f %f %f %f %f %f %f %f %f %f %f %f %f %f %f %f %f %f %f %f %f %f %f\n",
                                                                        totalTime,
                                                                        timeMemoryUpdate,
                                                                        timeReactivations,
                                                                        timeLikelihoodCalculation,
                                                                        timePosteriorCalculation,
                                                                        timeHypothesesCreation,
                                                                        timeHypothesesValidation,
                                                                        timeRealTimeLimitReachedProcess,
                                                                        timeStatsCreation,
                                                                        _highestHypothesis.second,
                                                                        0.0f,
                                                                        0.0f,
                                                                        0.0f,
                                                                        0.0f,
                                                                        0.0f,
                                                                        vpHypothesis,
                                                                        timeJoiningTrash,
                                                                        rehearsalValue,
                                                                        timeEmptyingTrash,
                                                                        timeRetrievalDbAccess,
                                                                        timeAddLoopClosureLink,
                                                                        timeMemoryCleanup,
                                                                        timeNeighborLinkRefining,
                                                                        timeProximityByTimeDetection,
                                                                        timeProximityBySpaceDetection,
                                                                        timeMapOptimization);
                std::string logI = uFormat("%d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d\n",
                                                                        _loopClosureHypothesis.first,
                                                                        _highestHypothesis.first,
                                                                        (int)signaturesRemoved.size(),
                                                                        0,
                                                                        refWordsCount,
                                                                        dictionarySize,
                                                                        int(_memory->getWorkingMem().size()),
                                                                        rejectedGlobalLoopClosure?1:0,
                                                                        0,
                                                                        0,
                                                                        int(signaturesRetrieved.size()),
                                                                        lcHypothesisReactivated,
                                                                        refUniqueWordsCount,
                                                                        retrievalId,
                                                                        0,
                                                                        rehearsalMaxId,
                                                                        rehearsalMaxId>0?1:0,
                                                                        localGraphSize,
                                                                        data.id(),
                                                                        _memory->getVWDictionary()->getIndexedWordsCount(),
                                                                        _memory->getVWDictionary()->getIndexMemoryUsed());
                if(_statisticLogsBufferedInRAM)
                {
                        _bufferedLogsF.push_back(logF);
                        _bufferedLogsI.push_back(logI);
                }
                else
                {
                        if(_foutFloat)
                        {
                                fprintf(_foutFloat, "%s", logF.c_str());
                        }
                        if(_foutInt)
                        {
                                fprintf(_foutInt, "%s", logI.c_str());
                        }
                }
                UINFO("Time logging = %f...", timer.ticks());
                //ULogger::flush();
        }
        timeFinalizingStatistics = timer.ticks();
        UDEBUG("End process, timeFinalizingStatistics=%fs", timeFinalizingStatistics);
        if(_publishStats)
        {
                statistics_.addStatistic(Statistics::kTimingFinalizing_statistics(), timeFinalizingStatistics*1000);
        }
 
        return true;
}
 
// SETTERS
void Rtabmap::setTimeThreshold(float maxTimeAllowed)
{
        //must be positive, 0 mean inf time allowed (no time limit)
        _maxTimeAllowed = maxTimeAllowed;
        if(_maxTimeAllowed < 0)
        {
                ULOGGER_WARN("maxTimeAllowed < 0, then setting it to 0 (inf).");
                _maxTimeAllowed = 0;
        }
        else if(_maxTimeAllowed > 0.0f && _maxTimeAllowed < 1.0f)
        {
                ULOGGER_WARN("Time threshold set to %fms, it is not in seconds!", _maxTimeAllowed);
        }
}
void Rtabmap::setMemoryThreshold(int maxMemoryAllowed)
{
        //must be positive, 0 mean inf memory allowed (no memory limit)
        _maxMemoryAllowed = maxMemoryAllowed;
        if(maxMemoryAllowed < 0)
        {
                ULOGGER_WARN("maxMemoryAllowed < 0, then setting it to 0 (inf).");
                _maxMemoryAllowed = 0;
        }
}
 
void Rtabmap::setWorkingDirectory(std::string path)
{
        path = uReplaceChar(path, '~', UDirectory::homeDir());
        if(!path.empty() && UDirectory::exists(path))
        {
                ULOGGER_DEBUG("Comparing new working directory path \"%s\" with \"%s\"", path.c_str(), _wDir.c_str());
                if(path.compare(_wDir) != 0)
                {
                        if (_foutFloat || _foutInt)
                        {
                                UWARN("Working directory has been changed from \"%s\" with \"%s\", new log files will be created.",
                                        path.c_str(), _wDir.c_str());
                        }
                        _wDir = path;
                        setupLogFiles();
                }
        }
        else if(path.empty())
        {
                _wDir.clear();
                setupLogFiles();
        }
        else
        {
                ULOGGER_ERROR("Directory \"%s\" doesn't exist!", path.c_str());
        }
}
 
void Rtabmap::rejectLastLoopClosure()
{
        if(_memory && _memory->getStMem().find(getLastLocationId())!=_memory->getStMem().end())
        {
                std::multimap<int, Link> links = _memory->getLinks(getLastLocationId(), false);
                bool linksRemoved = false;
                for(std::multimap<int, Link>::iterator iter = links.begin(); iter!=links.end(); ++iter)
                {
                        if(iter->second.type() == Link::kGlobalClosure ||
                                iter->second.type() == Link::kLocalSpaceClosure ||
                                iter->second.type() == Link::kLocalTimeClosure ||
                                iter->second.type() == Link::kUserClosure)
                        {
                                _memory->removeLink(iter->second.from(), iter->second.to());
                                std::multimap<int, Link>::iterator jter = graph::findLink(_constraints, iter->second.from(), iter->second.to(), true);
                                if(jter!=_constraints.end())
                                {
                                        _constraints.erase(jter);
                                        // second time if link is also inverted
                                        jter = graph::findLink(_constraints, iter->second.from(), iter->second.to(), true);
                                        if(jter!=_constraints.end())
                                        {
                                                _constraints.erase(jter);
                                        }
                                }
                                linksRemoved = true;
                        }
                }
 
                if(linksRemoved)
                {
                        _loopClosureHypothesis.first = 0;
 
                        // we have to re-optimize the graph without the rejected links
                        if(_memory->isIncremental() && _optimizedPoses.size())
                        {
                                UINFO("Update graph");
                                std::map<int, Transform> poses = _optimizedPoses;
                                std::multimap<int, Link> constraints;
                                cv::Mat covariance;
                                optimizeCurrentMap(getLastLocationId(), false, poses, covariance, &constraints);
 
                                if(poses.empty())
                                {
                                        UWARN("Graph optimization failed after removing loop closure links from last location!");
                                }
                                else
                                {
                                        UINFO("Updated local map (old size=%d, new size=%d)", (int)_optimizedPoses.size(), (int)poses.size());
                                        _optimizedPoses = poses;
                                        _constraints = constraints;
                                        _mapCorrection = _optimizedPoses.at(_memory->getLastWorkingSignature()->id()) * _memory->getLastWorkingSignature()->getPose().inverse();
                                }
                        }
                }
        }
}
 
void Rtabmap::deleteLastLocation()
{
        if(_memory && _memory->getStMem().size())
        {
                int lastId = *_memory->getStMem().rbegin();
                _memory->deleteLocation(lastId);
                // we have to re-optimize the graph without the deleted location
                if(_memory->isIncremental() && _optimizedPoses.size())
                {
                        UINFO("Update graph");
                        _optimizedPoses.erase(lastId);
                        std::map<int, Transform> poses = _optimizedPoses;
                        //remove all constraints with last localization id
                        for(std::multimap<int, Link>::iterator iter=_constraints.begin(); iter!=_constraints.end();)
                        {
                                if(iter->second.from() == lastId || iter->second.to() == lastId)
                                {
                                        _constraints.erase(iter++);
                                }
                                else
                                {
                                        ++iter;
                                }
                        }
 
                        if(poses.empty())
                        {
                                _mapCorrection.setIdentity();
                        }
                        else
                        {
                                std::multimap<int, Link> constraints;
                                cv::Mat covariance;
                                optimizeCurrentMap(_memory->getLastWorkingSignature()->id(), false, poses, covariance, &constraints);
 
                                if(poses.empty())
                                {
                                        UWARN("Graph optimization failed after deleting the last location!");
                                }
                                else
                                {
                                        _optimizedPoses = poses;
                                        _constraints = constraints;
                                        _mapCorrection = _optimizedPoses.at(_memory->getLastWorkingSignature()->id()) * _memory->getLastWorkingSignature()->getPose().inverse();
                                }
                        }
                }
        }
}
 
void Rtabmap::setOptimizedPoses(const std::map<int, Transform> & poses, const std::multimap<int, Link> & constraints)
{
        _optimizedPoses = poses;
    _constraints = constraints;
}
 
void Rtabmap::dumpData() const
{
        UDEBUG("");
        if(_memory)
        {
                if(this->getWorkingDir().empty())
                {
                        UERROR("Working directory not set.");
                }
                else
                {
                        _memory->dumpMemory(this->getWorkingDir());
                }
        }
}
 
// fromId must be in _memory and in _optimizedPoses
// Get poses in front of the robot, return optimized poses
std::map<int, Transform> Rtabmap::getForwardWMPoses(
                int fromId,
                int maxNearestNeighbors,
                float radius,
                int maxGraphDepth // 0 means ignore
                ) const
{
        std::map<int, Transform> poses;
        if(_memory && fromId > 0)
        {
                UDEBUG("");
                const Signature * fromS = _memory->getSignature(fromId);
                UASSERT(fromS != 0);
                UASSERT(_optimizedPoses.find(fromId) != _optimizedPoses.end());
 
                pcl::PointCloud<pcl::PointXYZ>::Ptr cloud(new pcl::PointCloud<pcl::PointXYZ>);
                cloud->resize(_optimizedPoses.size());
                std::vector<int> ids(_optimizedPoses.size());
                int oi = 0;
                const std::set<int> & stm = _memory->getStMem();
                //get distances
                std::map<int, float> foundIds;
                if(_memory->isIncremental())
                {
                        foundIds = _memory->getNeighborsIdRadius(fromId, radius, _optimizedPoses, maxGraphDepth);
                }
                else
                {
                        foundIds = graph::findNearestNodes(fromId, _optimizedPoses, radius);
                }
 
                float radiusSqrd = radius * radius;
                for(std::map<int, Transform>::const_iterator iter = _optimizedPoses.begin(); iter!=_optimizedPoses.end(); ++iter)
                {
                        if(iter->first != fromId)
                        {
                                if(stm.find(iter->first) == stm.end() &&
                                   uContains(foundIds, iter->first) &&
                                   (radiusSqrd==0 || foundIds.at(iter->first) <= radiusSqrd))
                                {
                                        (*cloud)[oi] = pcl::PointXYZ(iter->second.x(), iter->second.y(), iter->second.z());
                                        ids[oi++] = iter->first;
                                }
                        }
                }
 
                cloud->resize(oi);
                ids.resize(oi);
 
                Transform fromT = _optimizedPoses.at(fromId);
 
                if(cloud->size())
                {
                        //if(cloud->size())
                        //{
                        //      pcl::io::savePCDFile("radiusPoses.pcd", *cloud);
                        //      UWARN("Saved radiusPoses.pcd");
                        //}
 
                        //filter poses in front of the fromId
                        float x,y,z, roll,pitch,yaw;
                        fromT.getTranslationAndEulerAngles(x,y,z, roll,pitch,yaw);
 
                        pcl::CropBox<pcl::PointXYZ> cropbox;
                        cropbox.setInputCloud(cloud);
                        cropbox.setMin(Eigen::Vector4f(-1, -radius, -999999, 0));
                        cropbox.setMax(Eigen::Vector4f(radius, radius, 999999, 0));
                        cropbox.setRotation(Eigen::Vector3f(roll, pitch, yaw));
                        cropbox.setTranslation(Eigen::Vector3f(x, y, z));
                        cropbox.setRotation(Eigen::Vector3f(roll,pitch,yaw));
                        pcl::IndicesPtr indices(new std::vector<int>());
                        cropbox.filter(*indices);
 
                        //if(indices->size())
                        //{
                        //      pcl::io::savePCDFile("radiusCrop.pcd", *cloud, *indices);
                        //      UWARN("Saved radiusCrop.pcd");
                        //}
 
                        if(indices->size())
                        {
                                pcl::search::KdTree<pcl::PointXYZ>::Ptr kdTree(new pcl::search::KdTree<pcl::PointXYZ>);
                                kdTree->setInputCloud(cloud, indices);
                                std::vector<int> ind;
                                std::vector<float> dist;
                                pcl::PointXYZ pt(fromT.x(), fromT.y(), fromT.z());
                                kdTree->radiusSearch(pt, radius, ind, dist, maxNearestNeighbors);
                                //pcl::PointCloud<pcl::PointXYZ> inliers;
                                for(unsigned int i=0; i<ind.size(); ++i)
                                {
                                        if(ind[i] >=0)
                                        {
                                                Transform tmp = _optimizedPoses.find(ids[ind[i]])->second;
                                                //inliers.push_back(pcl::PointXYZ(tmp.x(), tmp.y(), tmp.z()));
                                                UDEBUG("Inlier %d: %s", ids[ind[i]], tmp.prettyPrint().c_str());
                                                poses.insert(std::make_pair(ids[ind[i]], tmp));
                                        }
                                }
 
                                //if(inliers.size())
                                //{
                                //      pcl::io::savePCDFile("radiusInliers.pcd", inliers);
                                //}
                                //if(nearestId >0)
                                //{
                                //      pcl::PointCloud<pcl::PointXYZ> c;
                                //      Transform ct = _optimizedPoses.find(nearestId)->second;
                                //      c.push_back(pcl::PointXYZ(ct.x(), ct.y(), ct.z()));
                                //      pcl::io::savePCDFile("radiusNearestPt.pcd", c);
                                //}
                        }
                }
        }
        return poses;
}
 
std::map<int, std::map<int, Transform> > Rtabmap::getPaths(const std::map<int, Transform> & posesIn, const Transform & target, int maxGraphDepth) const
{
        std::map<int, std::map<int, Transform> > paths;
        std::set<int> nodesSet;
        std::map<int, Transform> poses;
        for(std::map<int, Transform>::const_iterator iter=posesIn.lower_bound(1); iter!=posesIn.end(); ++iter)
        {
                nodesSet.insert(iter->first);
                poses.insert(*iter);
        }
        if(_memory && nodesSet.size() && !target.isNull())
        {
                double e0=0,e1=0,e2=0,e3=0,e4=0;
                UTimer t;
                e0 = t.ticks();
                // Segment poses connected only by neighbor links
                while(poses.size())
                {
                        std::map<int, Transform> path;
                        // select nearest pose and iterate neighbors from there
                        int nearestId = rtabmap::graph::findNearestNode(poses, target);
 
                        e1+=t.ticks();
 
                        if(nearestId == 0)
                        {
                                UWARN("Nearest id of %s in %d poses is 0 !? Returning empty path.", target.prettyPrint().c_str(), (int)poses.size());
                                break;
                        }
                        std::map<int, int> ids = _memory->getNeighborsId(nearestId, maxGraphDepth, 0, true, true, true, true, nodesSet);
 
                        e2+=t.ticks();
 
                        for(std::map<int, int>::iterator iter=ids.begin(); iter!=ids.end(); ++iter)
                        {
                                std::map<int, Transform>::iterator jter = poses.find(iter->first);
                                if(jter != poses.end())
                                {
                                        bool valid = path.empty();
                                        if(!valid)
                                        {
                                                // make sure it has a neighbor added to path
                                                std::multimap<int, Link> links = _memory->getNeighborLinks(iter->first);
                                                for(std::multimap<int, Link>::iterator kter=links.begin(); kter!=links.end() && !valid; ++kter)
                                                {
                                                        valid = path.find(kter->first) != path.end();
                                                }
                                        }
 
                                        if(valid)
                                        {
                                                //UDEBUG("%d <- %d", nearestId, jter->first);
                                                path.insert(*jter);
                                                poses.erase(jter);
                                        }
                                }
                        }
 
                        e3+=t.ticks();
 
                        if (path.size())
                        {
                                if (maxGraphDepth > 0 && !_memory->isGraphReduced() && (int)path.size() > maxGraphDepth * 2 + 1)
                                {
                                        UWARN("%s=Off but path(%d) > maxGraphDepth(%d)*2+1, nearestId=%d ids=%d. Is reduce graph activated before?",
                                                Parameters::kMemReduceGraph().c_str(), (int)path.size(), maxGraphDepth, nearestId, (int)ids.size());
                                }
                                paths.insert(std::make_pair(nearestId, path));
                        }
                        else
                        {
                                UWARN("path.size()=0!? nearestId=%d ids=%d, aborting...", nearestId, (int)ids.size());
                                break;
                        }
 
                        e4+=t.ticks();
                }
                UDEBUG("e0=%fs e1=%fs e2=%fs e3=%fs e4=%fs", e0, e1, e2, e3, e4);
        }
        return paths;
}
 
void Rtabmap::optimizeCurrentMap(
                int id,
                bool lookInDatabase,
                std::map<int, Transform> & optimizedPoses,
                cv::Mat & covariance,
                std::multimap<int, Link> * constraints,
                double * error,
                int * iterationsDone) const
{
        //Optimize the map
        UINFO("Optimize map: around location %d (lookInDatabase=%s)", id, lookInDatabase?"true":"false");
        if(_memory && id > 0)
        {
                UTimer timer;
                std::map<int, int> ids = _memory->getNeighborsId(id, 0, lookInDatabase?-1:0, true, false);
                if(!_optimizeFromGraphEnd && ids.size() > 1)
                {
                        id = ids.begin()->first;
                }
                UINFO("get %d ids time %f s", (int)ids.size(), timer.ticks());
 
                std::map<int, Transform> poses = Rtabmap::optimizeGraph(id, uKeysSet(ids), optimizedPoses, lookInDatabase, covariance, constraints, error, iterationsDone);
                UINFO("optimize time %f s", timer.ticks());
 
                if(poses.size())
                {
                        optimizedPoses = poses;
 
                        if(_memory->getSignature(id) && uContains(optimizedPoses, id))
                        {
                                Transform t = optimizedPoses.at(id) * _memory->getSignature(id)->getPose().inverse();
                                UINFO("Correction (from node %d) %s", id, t.prettyPrint().c_str());
                        }
                }
                else
                {
                        UWARN("Failed to optimize the graph! returning empty optimized poses...");
                        optimizedPoses.clear();
                        if(constraints)
                        {
                                constraints->clear();
                        }
                }
        }
}
 
std::map<int, Transform> Rtabmap::optimizeGraph(
                int fromId,
                const std::set<int> & ids,
                const std::map<int, Transform> & guessPoses,
                bool lookInDatabase,
                cv::Mat & covariance,
                std::multimap<int, Link> * constraints,
                double * error,
                int * iterationsDone) const
{
        UTimer timer;
        std::map<int, Transform> optimizedPoses;
        std::map<int, Transform> poses;
        std::multimap<int, Link> edgeConstraints;
        UDEBUG("ids=%d", (int)ids.size());
        _memory->getMetricConstraints(ids, poses, edgeConstraints, lookInDatabase, !_graphOptimizer->landmarksIgnored());
        UINFO("get constraints (ids=%d, %d poses, %d edges) time %f s", (int)ids.size(), (int)poses.size(), (int)edgeConstraints.size(), timer.ticks());
 
        // add landmark priors if there are some
        for(std::map<int, Transform>::iterator iter=poses.begin(); iter!=poses.end() && iter->first < 0; ++iter)
        {
                if(_markerPriors.find(iter->first) != _markerPriors.end())
                {
                        cv::Mat infMatrix = cv::Mat::eye(6, 6, CV_64FC1);
                        infMatrix(cv::Range(0,3), cv::Range(0,3)) /= _markerPriorsLinearVariance;
                        infMatrix(cv::Range(3,6), cv::Range(3,6)) /= _markerPriorsAngularVariance;
                        edgeConstraints.insert(std::make_pair(iter->first, Link(iter->first, iter->first, Link::kPosePrior, _markerPriors.at(iter->first), infMatrix)));
                        UDEBUG("Added prior %d : %s (variance: lin=%f ang=%f)", iter->first, _markerPriors.at(iter->first).prettyPrint().c_str(),
                                        _markerPriorsLinearVariance, _markerPriorsAngularVariance);
                }
        }
 
        if(_graphOptimizer->iterations() > 0)
        {
                for(std::map<int, Transform>::iterator iter=poses.begin(); iter!=poses.end(); ++iter)
                {
                        // Apply guess poses (if some), ignore for rootid to avoid origin drifting
                        std::map<int, Transform>::const_iterator foundGuess = guessPoses.find(iter->first);
                        if(foundGuess!=guessPoses.end() && iter->first != fromId)
                        {
                                iter->second = foundGuess->second;
                        }
                }
        }
 
 
        UASSERT(_graphOptimizer!=0);
        if(_graphOptimizer->iterations() == 0)
        {
                // Optimization disabled! Return not optimized poses.
                optimizedPoses = poses;
                if(constraints)
                {
                        *constraints = edgeConstraints;
                }
        }
        else
        {
                bool hasLandmarks = !edgeConstraints.empty() && edgeConstraints.begin()->first < 0;
                if(poses.size() != guessPoses.size() || hasLandmarks)
                {
                        UDEBUG("recompute poses using only links (robust to multi-session)");
                        std::map<int, Transform> posesOut;
                        std::multimap<int, Link> edgeConstraintsOut;
                        _graphOptimizer->getConnectedGraph(fromId, poses, edgeConstraints, posesOut, edgeConstraintsOut);
                        optimizedPoses = _graphOptimizer->optimize(fromId, posesOut, edgeConstraintsOut, covariance, 0, error, iterationsDone);
                        if(constraints)
                        {
                                *constraints = edgeConstraintsOut;
                        }
                }
                else
                {
                        UDEBUG("use input guess poses");
                        optimizedPoses = _graphOptimizer->optimize(fromId, poses, edgeConstraints, covariance, 0, error, iterationsDone);
                        if(constraints)
                        {
                                *constraints = edgeConstraints;
                        }
                }
 
                if(!poses.empty() && optimizedPoses.empty())
                {
                        UWARN("Optimization has failed (poses=%d, guess=%d, links=%d)...",
                                  (int)poses.size(), (int)guessPoses.size(), (int)edgeConstraints.size());
                }
        }
 
        UINFO("Optimization time %f s", timer.ticks());
 
        return optimizedPoses;
}
 
void Rtabmap::adjustLikelihood(std::map<int, float> & likelihood) const
{
        ULOGGER_DEBUG("likelihood.size()=%d", likelihood.size());
        UTimer timer;
        timer.start();
        if(likelihood.size()==0)
        {
                return;
        }
 
        // Use only non-null values (ignore virtual place)
        std::list<float> values;
        bool likelihoodNullValuesIgnored = true;
        for(std::map<int, float>::iterator iter = ++likelihood.begin(); iter!=likelihood.end(); ++iter)
        {
                if((iter->second >= 0 && !likelihoodNullValuesIgnored) ||
                   (iter->second > 0 && likelihoodNullValuesIgnored))
                {
                        values.push_back(iter->second);
                }
        }
        UDEBUG("values.size=%d", values.size());
 
        float mean = uMean(values);
        float stdDev = std::sqrt(uVariance(values, mean));
 
 
        //Adjust likelihood with mean and standard deviation (see Angeli phd)
        float epsilon = 0.0001;
        float max = 0.0f;
        int maxId = 0;
        for(std::map<int, float>::iterator iter=++likelihood.begin(); iter!= likelihood.end(); ++iter)
        {
                float value = iter->second;
                iter->second = 1.0f;
                if(value > mean+stdDev)
                {
                        if(_virtualPlaceLikelihoodRatio==0 && mean)
                        {
                                iter->second = (value-(stdDev-epsilon))/mean;
                        }
                        else if(_virtualPlaceLikelihoodRatio!=0 && stdDev)
                        {
                                iter->second = (value-mean)/stdDev;
                        }
                }
 
                if(value > max)
                {
                        max = value;
                        maxId = iter->first;
                }
        }
 
        if(_virtualPlaceLikelihoodRatio==0 && stdDev > epsilon && max)
        {
                likelihood.begin()->second = mean/stdDev + 1.0f;
        }
        else if(_virtualPlaceLikelihoodRatio!=0 && max > mean)
        {
                likelihood.begin()->second = stdDev/(max-mean) + 1.0f;
        }
        else
        {
                likelihood.begin()->second = 2.0f; //2 * std dev
        }
 
        double time = timer.ticks();
        UDEBUG("mean=%f, stdDev=%f, max=%f, maxId=%d, time=%fs", mean, stdDev, max, maxId, time);
}
 
void Rtabmap::dumpPrediction() const
{
        if(_memory && _bayesFilter)
        {
                if(this->getWorkingDir().empty())
                {
                        UERROR("Working directory not set.");
                        return;
                }
                std::list<int> signaturesToCompare;
                for(std::map<int, double>::const_iterator iter=_memory->getWorkingMem().begin();
                        iter!=_memory->getWorkingMem().end();
                        ++iter)
                {
                        if(iter->first > 0)
                        {
                                const Signature * s = _memory->getSignature(iter->first);
                                UASSERT(s!=0);
                                if(s->getWeight() != -1) // ignore intermediate nodes
                                {
                                        signaturesToCompare.push_back(iter->first);
                                }
                        }
                        else
                        {
                                // virtual signature should be added
                                signaturesToCompare.push_back(iter->first);
                        }
                }
                cv::Mat prediction = _bayesFilter->generatePrediction(_memory, uListToVector(signaturesToCompare));
 
                FILE* fout = 0;
                std::string fileName = this->getWorkingDir() + "/DumpPrediction.txt";
                #ifdef _MSC_VER
                        fopen_s(&fout, fileName.c_str(), "w");
                #else
                        fout = fopen(fileName.c_str(), "w");
                #endif
 
                if(fout)
                {
                        for(int i=0; i<prediction.rows; ++i)
                        {
                                for(int j=0; j<prediction.cols; ++j)
                                {
                                        fprintf(fout, "%f ",((float*)prediction.data)[j + i*prediction.cols]);
                                }
                                fprintf(fout, "\n");
                        }
                        fclose(fout);
                }
        }
        else
        {
                UWARN("Memory and/or the Bayes filter are not created");
        }
}
 
Signature Rtabmap::getSignatureCopy(int id, bool images, bool scan, bool userData, bool occupancyGrid, bool withWords, bool withGlobalDescriptors) const
{
        Signature s;
        if(_memory)
        {
                Transform odomPoseLocal;
                int weight = -1;
                int mapId = -1;
                std::string label;
                double stamp = 0;
                Transform groundTruth;
                std::vector<float> velocity;
                GPS gps;
                EnvSensors sensors;
                _memory->getNodeInfo(id, odomPoseLocal, mapId, weight, label, stamp, groundTruth, velocity, gps, sensors, true);
                SensorData data;
                data.setId(id);
                if(images || scan || userData || occupancyGrid)
                {
                        data = _memory->getNodeData(id, images, scan, userData, occupancyGrid);
                }
                if(!images && withWords)
                {
                        std::vector<CameraModel> models;
                        std::vector<StereoCameraModel> stereoModels;
                        _memory->getNodeCalibration(id, models, stereoModels);
                        data.setCameraModels(models);
                        data.setStereoCameraModels(stereoModels);
                }
 
                s=Signature(id,
                                mapId,
                                weight,
                                stamp,
                                label,
                                odomPoseLocal,
                                groundTruth,
                                data);
 
                std::multimap<int, Link> links = _memory->getLinks(id, true, true);
                for(std::multimap<int, Link>::iterator iter=links.begin(); iter!=links.end(); ++iter)
                {
                        if(iter->second.type() == Link::kLandmark)
                        {
                                s.addLandmark(iter->second);
                        }
                        else
                        {
                                s.addLink(iter->second);
                        }
                }
 
                if(withWords || withGlobalDescriptors)
                {
                        std::multimap<int, int> words;
                        std::vector<cv::KeyPoint> wordsKpts;
                        std::vector<cv::Point3f> words3;
                        cv::Mat wordsDescriptors;
                        std::vector<rtabmap::GlobalDescriptor> globalDescriptors;
                        _memory->getNodeWordsAndGlobalDescriptors(id, words, wordsKpts, words3, wordsDescriptors, globalDescriptors);
                        if(withWords)
                        {
                                s.setWords(words, wordsKpts, words3, wordsDescriptors);
                        }
                        if(withGlobalDescriptors)
                        {
                                s.sensorData().setGlobalDescriptors(globalDescriptors);
                        }
                }
                if(velocity.size()==6)
                {
                        s.setVelocity(velocity[0], velocity[1], velocity[2], velocity[3], velocity[4], velocity[5]);
                }
                s.sensorData().setGPS(gps);
                s.sensorData().setEnvSensors(sensors);
        }
        return s;
}
 
void Rtabmap::get3DMap(
                std::map<int, Signature> & signatures,
                std::map<int, Transform> & poses,
                std::multimap<int, Link> & constraints,
                bool optimized,
                bool global) const
{
        UDEBUG("");
        return getGraph(poses, constraints, optimized, global, &signatures, true, true, true, true);
}
 
void Rtabmap::getGraph(
                std::map<int, Transform> & poses,
                std::multimap<int, Link> & constraints,
                bool optimized,
                bool global,
                std::map<int, Signature> * signatures,
                bool withImages,
                bool withScan,
                bool withUserData,
                bool withGrid,
                bool withWords,
                bool withGlobalDescriptors) const
{
        if(_memory && _memory->getLastWorkingSignature())
        {
                if(_rgbdSlamMode)
                {
                        if(optimized)
                        {
                                poses = _optimizedPoses; // guess
                                cv::Mat covariance;
                                this->optimizeCurrentMap(_memory->getLastWorkingSignature()->id(), global, poses, covariance, &constraints);
                                if(!global && !_optimizedPoses.empty())
                                {
                                        // We send directly the already optimized poses if they are set
                                        UDEBUG("_optimizedPoses=%ld poses=%ld", _optimizedPoses.size(), poses.size());
                                        poses = _optimizedPoses;
                                }
                        }
                        else
                        {
                                std::map<int, int> ids = _memory->getNeighborsId(_memory->getLastWorkingSignature()->id(), 0, global?-1:0, true);
                                _memory->getMetricConstraints(uKeysSet(ids), poses, constraints, global);
                        }
                }
                else
                {
                        // no optimization on appearance-only mode
                        std::map<int, int> ids = _memory->getNeighborsId(_memory->getLastWorkingSignature()->id(), 0, global?-1:0, true);
                        _memory->getMetricConstraints(uKeysSet(ids), poses, constraints, global);
                }
 
                if(signatures)
                {
                        // Get data
                        std::set<int> ids = uKeysSet(_memory->getWorkingMem()); // WM
 
                        //remove virtual signature
                        ids.erase(Memory::kIdVirtual);
 
                        ids.insert(_memory->getStMem().begin(), _memory->getStMem().end()); // STM + WM
                        if(global)
                        {
                                ids = _memory->getAllSignatureIds(); // STM + WM + LTM, ignoreChildren=true
                        }
 
                        for(std::set<int>::iterator iter = ids.begin(); iter!=ids.end(); ++iter)
                        {
                                signatures->insert(std::make_pair(*iter, getSignatureCopy(*iter, withImages, withScan, withUserData, withGrid, withWords, withGlobalDescriptors)));
                        }
                }
        }
        else if(_memory && (_memory->getStMem().size() || _memory->getWorkingMem().size() > 1))
        {
                UERROR("Last working signature is null!?");
        }
        else if(_memory == 0)
        {
                UWARN("Memory not initialized...");
        }
}
 
std::map<int, Transform> Rtabmap::getNodesInRadius(const Transform & pose, float radius, int k, std::map<int, float> * distsSqr)
{
        std::map<int, float> nearestNodesTmp;
        std::map<int, float> * nearestNodesPtr = distsSqr == 0? &nearestNodesTmp : distsSqr;
        *nearestNodesPtr = graph::findNearestNodes(pose, _optimizedPoses, radius<=0?_localRadius:radius, 0, k);
        std::map<int, Transform> nearestPoses;
        for(std::map<int, float>::iterator iter=nearestNodesPtr->begin(); iter!=nearestNodesPtr->end(); ++iter)
        {
                nearestPoses.insert(*_optimizedPoses.find(iter->first));
        }
        return nearestPoses;
}
 
std::map<int, Transform> Rtabmap::getNodesInRadius(int nodeId, float radius, int k, std::map<int, float> * distsSqr)
{
        UDEBUG("nodeId=%d, radius=%f", nodeId, radius);
        std::map<int, float> nearestNodesTmp;
        std::map<int, float> * nearestNodesPtr = distsSqr == 0? &nearestNodesTmp : distsSqr;
        if(nodeId==0 && !_lastLocalizationPose.isNull() && !_lastLocalizationPose.isIdentity())
        {
                *nearestNodesPtr = graph::findNearestNodes(_lastLocalizationPose, _optimizedPoses, radius<=0?_localRadius:radius, 0, k);
        }
        else
        {
                if(nodeId==0 && !_optimizedPoses.empty())
                {
                        nodeId = _optimizedPoses.rbegin()->first;
                }
 
                if(_optimizedPoses.find(nodeId) != _optimizedPoses.end())
                {
                        *nearestNodesPtr = graph::findNearestNodes(nodeId, _optimizedPoses, radius<=0?_localRadius:radius, 0, k);
                }
        }
 
        std::map<int, Transform> nearestPoses;
        for(std::map<int, float>::iterator iter=nearestNodesPtr->begin(); iter!=nearestNodesPtr->end(); ++iter)
        {
                nearestPoses.insert(*_optimizedPoses.find(iter->first));
        }
 
        return nearestPoses;
}
 
int Rtabmap::detectMoreLoopClosures(
                float clusterRadiusMax,
                float clusterAngle,
                int iterations,
                bool intraSession,
                bool interSession,
                const ProgressState * processState,
                float clusterRadiusMin)
{
        UASSERT(iterations>0);
 
        if(_graphOptimizer->iterations() <= 0)
        {
                UERROR("Cannot detect more loop closures if graph optimization iterations = 0");
                return -1;
        }
        if(!_rgbdSlamMode)
        {
                UERROR("Detecting more loop closures can be done only in RGBD-SLAM mode.");
                return -1;
        }
        if(!intraSession && !interSession)
        {
                UERROR("Intra and/or inter session argument should be true.");
                return -1;
        }
 
        std::list<Link> loopClosuresAdded;
        std::multimap<int, int> checkedLoopClosures;
 
        std::map<int, Transform> posesToCheckLoopClosures;
        std::map<int, Transform> poses;
        std::multimap<int, Link> links;
        std::map<int, Signature> signatures; // some signatures may be in LTM, get them all
        this->getGraph(poses, links, true, true, &signatures);
 
        std::map<int, int> mapIds;
        UDEBUG("remove all invalid or intermediate nodes, fill mapIds");
        for(std::map<int, Transform>::iterator iter=poses.upper_bound(0); iter!=poses.end();++iter)
        {
                if(signatures.at(iter->first).getWeight() >= 0)
                {
                        posesToCheckLoopClosures.insert(*iter);
                        mapIds.insert(std::make_pair(iter->first, signatures.at(iter->first).mapId()));
                }
        }
 
        for(int n=0; n<iterations; ++n)
        {
                UINFO("Looking for more loop closures, clustering poses... (iteration=%d/%d, radius=%f m angle=%f rad)",
                                n+1, iterations, clusterRadiusMax, clusterAngle);
 
                std::multimap<int, int> clusters = graph::radiusPosesClustering(
                                posesToCheckLoopClosures,
                                clusterRadiusMax,
                                clusterAngle);
 
                UINFO("Looking for more loop closures, clustering poses... found %d clusters.", (int)clusters.size());
 
                int i=0;
                std::set<int> addedLinks;
                for(std::multimap<int, int>::iterator iter=clusters.begin(); iter!= clusters.end(); ++iter, ++i)
                {
                        if(processState && processState->isCanceled())
                        {
                                return -1;
                                break;
                        }
 
                        int from = iter->first;
                        int to = iter->second;
                        if(from > to)
                        {
                                from = iter->second;
                                to = iter->first;
                        }
 
                        int mapIdFrom = uValue(mapIds, from, 0);
                        int mapIdTo = uValue(mapIds, to, 0);
 
                        if((interSession && mapIdFrom != mapIdTo) ||
                           (intraSession && mapIdFrom == mapIdTo))
                        {
 
                                bool alreadyChecked = false;
                                for(std::multimap<int, int>::iterator jter = checkedLoopClosures.lower_bound(from);
                                        !alreadyChecked && jter!=checkedLoopClosures.end() && jter->first == from;
                                        ++jter)
                                {
                                        if(to == jter->second)
                                        {
                                                alreadyChecked = true;
                                        }
                                }
 
                                if(!alreadyChecked)
                                {
                                        // only add new links and one per cluster per iteration
                                        if(addedLinks.find(from) == addedLinks.end() &&
                                           addedLinks.find(to) == addedLinks.end() &&
                                           rtabmap::graph::findLink(links, from, to) == links.end())
                                        {
                                                // Reverify if in the bounds with the current optimized graph
                                                Transform delta = poses.at(from).inverse() * poses.at(to);
                                                if(delta.getNorm() < clusterRadiusMax &&
                                                   delta.getNorm() >= clusterRadiusMin)
                                                {
                                                        checkedLoopClosures.insert(std::make_pair(from, to));
 
                                                        UASSERT(signatures.find(from) != signatures.end());
                                                        UASSERT(signatures.find(to) != signatures.end());
 
                                                        Transform guess;
                                                        if(_proximityBySpace && uContains(poses, from) && uContains(poses, to))
                                                        {
                                                                guess = poses.at(from).inverse() * poses.at(to);
                                                        }
 
                                                        RegistrationInfo info;
                                                        // use signatures instead of IDs because some signatures may not be in WM
                                                        Transform t = _memory->computeTransform(signatures.at(from), signatures.at(to), guess, &info);
 
                                                        if(!t.isNull())
                                                        {
                                                                bool updateConstraints = true;
 
                                                                //optimize the graph to see if the new constraint is globally valid
 
                                                                int fromId = from;
                                                                int mapId = signatures.at(from).mapId();
                                                                // use first node of the map containing from
                                                                for(std::map<int, Signature>::iterator ster=signatures.begin(); ster!=signatures.end(); ++ster)
                                                                {
                                                                        if(ster->second.mapId() == mapId)
                                                                        {
                                                                                fromId = ster->first;
                                                                                break;
                                                                        }
                                                                }
                                                                std::multimap<int, Link> linksIn = links;
                                                                linksIn.insert(std::make_pair(from, Link(from, to, Link::kUserClosure, t, getInformation(info.covariance))));
                                                                const Link * maxLinearLink = 0;
                                                                const Link * maxAngularLink = 0;
                                                                float maxLinearError = 0.0f;
                                                                float maxAngularError = 0.0f;
                                                                float maxLinearErrorRatio = 0.0f;
                                                                float maxAngularErrorRatio = 0.0f;
                                                                std::map<int, Transform> optimizedPoses;
                                                                std::multimap<int, Link> links;
                                                                UASSERT(poses.find(fromId) != poses.end());
                                                                UASSERT_MSG(poses.find(from) != poses.end(), uFormat("id=%d poses=%d links=%d", from, (int)poses.size(), (int)links.size()).c_str());
                                                                UASSERT_MSG(poses.find(to) != poses.end(), uFormat("id=%d poses=%d links=%d", to, (int)poses.size(), (int)links.size()).c_str());
                                                                _graphOptimizer->getConnectedGraph(fromId, poses, linksIn, optimizedPoses, links);
                                                                UASSERT(optimizedPoses.find(fromId) != optimizedPoses.end());
                                                                UASSERT_MSG(optimizedPoses.find(from) != optimizedPoses.end(), uFormat("id=%d poses=%d links=%d", from, (int)optimizedPoses.size(), (int)links.size()).c_str());
                                                                UASSERT_MSG(optimizedPoses.find(to) != optimizedPoses.end(), uFormat("id=%d poses=%d links=%d", to, (int)optimizedPoses.size(), (int)links.size()).c_str());
                                                                UASSERT(graph::findLink(links, from, to) != links.end());
                                                                optimizedPoses = _graphOptimizer->optimize(fromId, optimizedPoses, links);
                                                                std::string msg;
                                                                if(optimizedPoses.size())
                                                                {
                                                                        graph::computeMaxGraphErrors(
                                                                                        optimizedPoses,
                                                                                        links,
                                                                                        maxLinearErrorRatio,
                                                                                        maxAngularErrorRatio,
                                                                                        maxLinearError,
                                                                                        maxAngularError,
                                                                                        &maxLinearLink,
                                                                                        &maxAngularLink);
                                                                        if(maxLinearLink)
                                                                        {
                                                                                UINFO("Max optimization linear error = %f m (link %d->%d)", maxLinearError, maxLinearLink->from(), maxLinearLink->to());
                                                                                if(_optimizationMaxError > 0.0f && maxLinearErrorRatio > _optimizationMaxError)
                                                                                {
                                                                                        msg = uFormat("Rejecting edge %d->%d because "
                                                                                                                "graph error is too large after optimization (%f m for edge %d->%d with ratio %f > std=%f m). "
                                                                                                                "\"%s\" is %f.",
                                                                                                                from,
                                                                                                                to,
                                                                                                                maxLinearError,
                                                                                                                maxLinearLink->from(),
                                                                                                                maxLinearLink->to(),
                                                                                                                maxLinearErrorRatio,
                                                                                                                sqrt(maxLinearLink->transVariance()),
                                                                                                                Parameters::kRGBDOptimizeMaxError().c_str(),
                                                                                                                _optimizationMaxError);
                                                                                }
                                                                                else if(_optimizationMaxError == 0.0f && maxLinearErrorRatio>100 && !_graphOptimizer->isRobust())
                                                                                {
                                                                                        UERROR("Huge optimization error detected!"
                                                                                                        "Linear error ratio of %f (edge %d->%d, type=%d, abs error=%f m, stddev=%f). You may consider "
                                                                                                        "enabling \"%s\" to reject those bad optimizations by setting it to a non null value!",
                                                                                                        maxLinearErrorRatio,
                                                                                                        maxLinearLink->from(),
                                                                                                        maxLinearLink->to(),
                                                                                                        maxLinearLink->type(),
                                                                                                        maxLinearError,
                                                                                                        sqrt(maxLinearLink->transVariance()),
                                                                                                        Parameters::kRGBDOptimizeMaxError().c_str());
                                                                                }
                                                                        }
                                                                        else if(maxAngularLink)
                                                                        {
                                                                                UINFO("Max optimization angular error = %f deg (link %d->%d)", maxAngularError*180.0f/M_PI, maxAngularLink->from(), maxAngularLink->to());
                                                                                if(_optimizationMaxError > 0.0f && maxAngularErrorRatio > _optimizationMaxError)
                                                                                {
                                                                                        msg = uFormat("Rejecting edge %d->%d because "
                                                                                                                "graph error is too large after optimization (%f deg for edge %d->%d with ratio %f > std=%f deg). "
                                                                                                                "\"%s\" is %f m.",
                                                                                                                from,
                                                                                                                to,
                                                                                                                maxAngularError*180.0f/M_PI,
                                                                                                                maxAngularLink->from(),
                                                                                                                maxAngularLink->to(),
                                                                                                                maxAngularErrorRatio,
                                                                                                                sqrt(maxAngularLink->rotVariance()),
                                                                                                                Parameters::kRGBDOptimizeMaxError().c_str(),
                                                                                                                _optimizationMaxError);
                                                                                }
                                                                                else if(_optimizationMaxError == 0.0f && maxAngularErrorRatio>100 && !_graphOptimizer->isRobust())
                                                                                {
                                                                                        UERROR("Huge optimization error detected!"
                                                                                                        "Angular error ratio of %f (edge %d->%d, type=%d, abs error=%f m, stddev=%f). You may consider "
                                                                                                        "enabling \"%s\" to reject those bad optimizations by setting it to a non null value!",
                                                                                                        maxAngularErrorRatio,
                                                                                                        maxAngularLink->from(),
                                                                                                        maxAngularLink->to(),
                                                                                                        maxAngularLink->type(),
                                                                                                        maxAngularError*180.0f/CV_PI,
                                                                                                        sqrt(maxAngularLink->rotVariance()),
                                                                                                        Parameters::kRGBDOptimizeMaxError().c_str());
                                                                                }
                                                                        }
                                                                }
                                                                else
                                                                {
                                                                        msg = uFormat("Rejecting edge %d->%d because graph optimization has failed!",
                                                                                                from,
                                                                                                to);
                                                                }
                                                                if(!msg.empty())
                                                                {
                                                                        UWARN("%s", msg.c_str());
                                                                        updateConstraints = false;
                                                                }
                                                                else
                                                                {
                                                                        poses = optimizedPoses;
                                                                }
 
                                                                if(updateConstraints)
                                                                {
                                                                        addedLinks.insert(from);
                                                                        addedLinks.insert(to);
                                                                        cv::Mat inf = getInformation(info.covariance);
                                                                        links.insert(std::make_pair(from, Link(from, to, Link::kUserClosure, t, inf)));
                                                                        loopClosuresAdded.push_back(Link(from, to, Link::kUserClosure, t, inf));
                                                                        std::string msg = uFormat("Iteration %d/%d: Added loop closure %d->%d! (%d/%d)", n+1, iterations, from, to, i+1, (int)clusters.size());
                                                                        UINFO(msg.c_str());
 
                                                                        if(processState)
                                                                        {
                                                                                UINFO(msg.c_str());
                                                                                if(!processState->callback(msg))
                                                                                {
                                                                                        return -1;
                                                                                }
                                                                        }
                                                                }
                                                        }
                                                }
                                        }
                                }
                        }
                }
 
                if(processState)
                {
                        std::string msg = uFormat("Iteration %d/%d: Detected %d total loop closures!", n+1, iterations, (int)addedLinks.size()/2);
                        UINFO(msg.c_str());
                        if(!processState->callback(msg))
                        {
                                return -1;
                        }
                }
                else
                {
                        UINFO("Iteration %d/%d: Detected %d total loop closures!", n+1, iterations, (int)addedLinks.size()/2);
                }
 
                if(addedLinks.size() == 0)
                {
                        break;
                }
 
                UINFO("Optimizing graph with new links (%d nodes, %d constraints)...",
                                (int)poses.size(), (int)links.size());
                int fromId = _optimizeFromGraphEnd?poses.rbegin()->first:poses.begin()->first;
                poses = _graphOptimizer->optimize(fromId, poses, links, 0);
                if(poses.size() == 0)
                {
                        UERROR("Optimization failed! Rejecting all loop closures...");
                        loopClosuresAdded.clear();
                        return -1;
                }
                UINFO("Optimizing graph with new links... done!");
        }
        UINFO("Total added %d loop closures.", (int)loopClosuresAdded.size());
 
        if(loopClosuresAdded.size())
        {
                for(std::list<Link>::iterator iter=loopClosuresAdded.begin(); iter!=loopClosuresAdded.end(); ++iter)
                {
                        _memory->addLink(*iter, true);
                }
                // Update optimized poses
                for(std::map<int, Transform>::iterator iter=_optimizedPoses.begin(); iter!=_optimizedPoses.end(); ++iter)
                {
                        std::map<int, Transform>::iterator jter = poses.find(iter->first);
                        if(jter != poses.end())
                        {
                                iter->second = jter->second;
                        }
                }
                std::map<int, Transform> tmp;
                // Update also the links if some have been added in WM
                _memory->getMetricConstraints(uKeysSet(_optimizedPoses), tmp, _constraints, false);
                // This will force rtabmap_ros to regenerate the global occupancy grid if there was one
                _memory->save2DMap(cv::Mat(), 0, 0, 0);
        }
        return (int)loopClosuresAdded.size();
}
 
bool Rtabmap::globalBundleAdjustment(
                int optimizerType,
                bool rematchFeatures,
                int iterations,
                float pixelVariance)
{
        if(!_optimizedPoses.empty() && !_constraints.empty())
        {
                int iterations = Parameters::defaultOptimizerIterations();
                float pixelVariance = Parameters::defaultg2oPixelVariance();
                ParametersMap params = _parameters;
                Parameters::parse(params, Parameters::kOptimizerIterations(), iterations);
                Parameters::parse(params, Parameters::kg2oPixelVariance(), pixelVariance);
                if(iterations > 0)
                {
                        uInsert(params, ParametersPair(Parameters::kOptimizerIterations(), uNumber2Str(iterations)));
                }
                if(pixelVariance > 0.0f)
                {
                        uInsert(params, ParametersPair(Parameters::kg2oPixelVariance(), uNumber2Str(pixelVariance)));
                }
 
                std::map<int, Signature> signatures;
                for(std::map<int, Transform>::iterator iter=_optimizedPoses.lower_bound(1); iter!=_optimizedPoses.end(); ++iter)
                {
                        if(_memory->getSignature(iter->first))
                        {
                                signatures.insert(std::make_pair(iter->first, *_memory->getSignature(iter->first)));
                        }
                }
 
                Optimizer * optimizer = Optimizer::create((Optimizer::Type)optimizerType, params);
                std::map<int, Transform> poses = optimizer->optimizeBA(
                                _optimizeFromGraphEnd?_optimizedPoses.lower_bound(1)->first:_optimizedPoses.rbegin()->first,
                                _optimizedPoses,
                                _constraints,
                                signatures,
                                rematchFeatures);
                delete optimizer;
 
                if(poses.empty())
                {
                        UERROR("Optimization failed!");
                }
                else
                {
                        _optimizedPoses = poses;
                        // This will force rtabmap_ros to regenerate the global occupancy grid if there was one
                        _memory->save2DMap(cv::Mat(), 0, 0, 0);
                        return true;
                }
        }
        else
        {
                UERROR("Optimized poses (%ld) or constraints (%ld) are empty!", _optimizedPoses.size(), _constraints.size());
        }
        return false;
}
 
int Rtabmap::cleanupLocalGrids(
                const std::map<int, Transform> & poses,
                const cv::Mat & map,
                float xMin,
                float yMin,
                float cellSize,
                int cropRadius,
                bool filterScans)
{
        if(_memory)
        {
                return _memory->cleanupLocalGrids(
                                poses,
                                map,
                                xMin,
                                yMin,
                                cellSize,
                                cropRadius,
                                filterScans);
        }
        return -1;
}
 
int Rtabmap::refineLinks()
{
        if(!_rgbdSlamMode)
        {
                UERROR("Refining links can be done only in RGBD-SLAM mode.");
                return -1;
        }
 
        std::list<Link> linksRefined;
 
        std::map<int, Transform> poses;
        std::multimap<int, Link> links;
        std::map<int, Signature> signatures;
        this->getGraph(poses, links, false, true, &signatures);
 
        int i=0;
        for(std::multimap<int, Link>::iterator iter=links.lower_bound(1); iter!= links.end(); ++iter)
        {
                int from = iter->second.from();
                int to = iter->second.to();
 
                UASSERT(signatures.find(from) != signatures.end());
                UASSERT(signatures.find(to) != signatures.end());
 
                RegistrationInfo info;
                // use signatures instead of IDs because some signatures may not be in WM
                Transform t = _memory->computeTransform(signatures.at(from), signatures.at(to), iter->second.transform(), &info);
 
                if(!t.isNull())
                {
                        linksRefined.push_back(Link(from, to, iter->second.type(), t, info.covariance.inv()));
                        UINFO("Refined link %d->%d! (%d/%d)", from, to, ++i, (int)links.size());
                }
        }
        UINFO("Total refined %d links.", (int)linksRefined.size());
 
        if(linksRefined.size())
        {
                for(std::list<Link>::iterator iter=linksRefined.begin(); iter!=linksRefined.end(); ++iter)
                {
                        _memory->updateLink(*iter, true);
                }
        }
        return (int)linksRefined.size();
}
 
bool Rtabmap::addLink(const Link & link)
{
        const Transform & t = link.transform();
        if(!_rgbdSlamMode)
        {
                UERROR("Adding new link can be done only in RGBD-SLAM mode.");
                return false;
        }
        if(!_memory)
        {
                UERROR("Memory is not initialized.");
                return false;
        }
        if(t.isNull())
        {
                UERROR("Link's transform is null! (%d->%d type=%s)", link.from(), link.to(), link.typeName().c_str());
                return false;
        }
        if(_memory->isIncremental())
        {
                if(_memory->getSignature(link.from()) == 0)
                {
                        UERROR("Link's \"from id\" %d is not in working memory", link.from());
                        return false;
                }
                if(_memory->getSignature(link.to()) == 0)
                {
                        UERROR("Link's \"to id\" %d is not in working memory", link.to());
                        return false;
                }
 
                if(_optimizedPoses.find(link.from()) == _optimizedPoses.end() &&
                   _optimizedPoses.find(link.to()) == _optimizedPoses.end())
                {
                        UERROR("Neither nodes %d or %d are in the local graph (size=%d). One of the 2 nodes should be in the local graph.", (int)_optimizedPoses.size(), link.from(), link.to());
                        return false;
                }
 
                // add temporary the link
                if(!_memory->addLink(link))
                {
                        UERROR("Cannot add new link %d->%d to memory", link.from(), link.to());
                        return false;
                }
 
                // optimize with new link
                std::map<int, Transform> poses = _optimizedPoses;
                std::multimap<int, Link> links;
                cv::Mat covariance;
                optimizeCurrentMap(this->getLastLocationId(), false, poses, covariance, &links);
 
                if(poses.find(link.from()) == poses.end())
                {
                        UERROR("Link's \"from id\" %d is not in the graph (size=%d)", link.from(), (int)poses.size());
                        _memory->removeLink(link.from(), link.to());
                        return false;
                }
                if(poses.find(link.to()) == poses.end())
                {
                        UERROR("Link's \"to id\" %d is not in the graph (size=%d)", link.to(), (int)poses.size());
                        _memory->removeLink(link.from(), link.to());
                        return false;
                }
 
                std::string msg;
                if(poses.empty())
                {
                        msg = uFormat("Rejecting edge %d->%d because graph optimization has failed!", link.from(), link.to());
                }
                else
                {
                        float maxLinearError = 0.0f;
                        float maxLinearErrorRatio = 0.0f;
                        float maxAngularError = 0.0f;
                        float maxAngularErrorRatio = 0.0f;
                        const Link * maxLinearLink = 0;
                        const Link * maxAngularLink = 0;
 
                        graph::computeMaxGraphErrors(
                                        poses,
                                        links,
                                        maxLinearErrorRatio,
                                        maxAngularErrorRatio,
                                        maxLinearError,
                                        maxAngularError,
                                        &maxLinearLink,
                                        &maxAngularLink);
                        if(maxLinearLink)
                        {
                                UINFO("Max optimization linear error = %f m (link %d->%d)", maxLinearError, maxLinearLink->from(), maxLinearLink->to());
                                if(_optimizationMaxError > 0.0f && maxLinearErrorRatio > _optimizationMaxError)
                                {
                                        msg = uFormat("Rejecting edge %d->%d because "
                                                          "graph error is too large after optimization (%f m for edge %d->%d with ratio %f > std=%f m). "
                                                          "\"%s\" is %f.",
                                                          link.from(),
                                                          link.to(),
                                                          maxLinearError,
                                                          maxLinearLink->from(),
                                                          maxLinearLink->to(),
                                                          maxLinearErrorRatio,
                                                          sqrt(maxLinearLink->transVariance()),
                                                          Parameters::kRGBDOptimizeMaxError().c_str(),
                                                          _optimizationMaxError);
                                }
                                else if(_optimizationMaxError == 0.0f && maxLinearErrorRatio>100 && !_graphOptimizer->isRobust())
                                {
                                        UERROR("Huge optimization error detected!"
                                                        "Linear error ratio of %f (edge %d->%d, type=%d, abs error=%f m, stddev=%f). You may consider "
                                                        "enabling \"%s\" to reject those bad optimizations by setting it to a non null value!",
                                                        maxLinearErrorRatio,
                                                        maxLinearLink->from(),
                                                        maxLinearLink->to(),
                                                        maxLinearLink->type(),
                                                        maxLinearError,
                                                        sqrt(maxLinearLink->transVariance()),
                                                        Parameters::kRGBDOptimizeMaxError().c_str());
                                }
                        }
                        else if(maxAngularLink)
                        {
                                UINFO("Max optimization angular error = %f deg (link %d->%d)", maxAngularError*180.0f/M_PI, maxAngularLink->from(), maxAngularLink->to());
                                if(_optimizationMaxError > 0.0f && maxAngularErrorRatio > _optimizationMaxError)
                                {
                                        msg = uFormat("Rejecting edge %d->%d because "
                                                          "graph error is too large after optimization (%f deg for edge %d->%d with ratio %f > std=%f deg). "
                                                          "\"%s\" is %f m.",
                                                          link.from(),
                                                          link.to(),
                                                          maxAngularError*180.0f/M_PI,
                                                          maxAngularLink->from(),
                                                          maxAngularLink->to(),
                                                          maxAngularErrorRatio,
                                                          sqrt(maxAngularLink->rotVariance()),
                                                          Parameters::kRGBDOptimizeMaxError().c_str(),
                                                          _optimizationMaxError);
                                }
                                else if(_optimizationMaxError == 0.0f && maxAngularErrorRatio>100 && !_graphOptimizer->isRobust())
                                {
                                        UERROR("Huge optimization error detected!"
                                                        "Angular error ratio of %f (edge %d->%d, type=%d, abs error=%f m, stddev=%f). You may consider "
                                                        "enabling \"%s\" to reject those bad optimizations by setting it to a non null value!",
                                                        maxAngularErrorRatio,
                                                        maxAngularLink->from(),
                                                        maxAngularLink->to(),
                                                        maxAngularLink->type(),
                                                        maxAngularError*180.0f/CV_PI,
                                                        sqrt(maxAngularLink->rotVariance()),
                                                        Parameters::kRGBDOptimizeMaxError().c_str());
                                }
                        }
                }
                if(!msg.empty())
                {
                        UERROR("%s", msg.c_str());
                        _memory->removeLink(link.from(), link.to());
                        return false;
                }
 
                // Update optimized poses
                for(std::map<int, Transform>::iterator iter=_optimizedPoses.begin(); iter!=_optimizedPoses.end(); ++iter)
                {
                        std::map<int, Transform>::iterator jter = poses.find(iter->first);
                        if(jter != poses.end())
                        {
                                iter->second = jter->second;
                        }
                }
                if(!_optimizeFromGraphEnd)
                {
                        _mapCorrection = _optimizedPoses.rbegin()->second * _memory->getSignature(_optimizedPoses.rbegin()->first)->getPose().inverse();
                }
 
                std::map<int, Transform> tmp;
                // Update also the links if some have been added in WM
                _memory->getMetricConstraints(uKeysSet(_optimizedPoses), tmp, _constraints, false);
                // This will force rtabmap_ros to regenerate the global occupancy grid if there was one
                _memory->save2DMap(cv::Mat(), 0, 0, 0);
 
                return true;
        }
        else // localization mode
        {
                int oldestId = link.from()>link.to()?link.to():link.from();
                int newestId = link.from()<link.to()?link.to():link.from();
 
                if(_memory->getSignature(oldestId) == 0)
                {
                        UERROR("Link's id %d is not in working memory", oldestId);
                        return false;
                }
                if(_optimizedPoses.find(oldestId) == _optimizedPoses.end())
                {
                        UERROR("Link's id %d is not in the optimized graph (_optimizedPoses=%d)", oldestId, (int)_optimizedPoses.size());
                        return false;
                }
                if(_optimizeFromGraphEnd)
                {
                        UERROR("Adding link with %s=true in localization mode is not supported.", Parameters::kRGBDOptimizeFromGraphEnd().c_str());
                        return false;
                }
                if(_odomCachePoses.find(newestId) == _odomCachePoses.end())
                {
                        if(!_odomCachePoses.empty())
                        {
                                UERROR("Link's id %d is not in the odometry cache (oldest=%d, newest=%d, %s=%d)",
                                                newestId,
                                                _odomCachePoses.begin()->first,
                                                _odomCachePoses.rbegin()->first,
                                                Parameters::kRGBDMaxOdomCacheSize().c_str(),
                                                _maxOdomCacheSize);
                        }
                        else
                        {
                                UERROR("Link's id %d is not in the odometry cache (%s=%d).",
                                                newestId,
                                                Parameters::kRGBDMaxOdomCacheSize().c_str(),
                                                _maxOdomCacheSize);
                        }
                        return false;
                }
 
                // Verify if the new localization is valid by checking if there is
                // not too much deformation using current odometry poses
                // This will also refine localization links
 
                std::map<int, Transform> poses = _odomCachePoses;
                std::multimap<int, Link> constraints = _odomCacheConstraints;
                constraints.insert(std::make_pair(link.from(), link));
                for(std::multimap<int, Link>::iterator iter=constraints.begin(); iter!=constraints.end(); ++iter)
                {
                        std::map<int, Transform>::iterator iterPose = _optimizedPoses.find(iter->second.to());
                        if(iterPose != _optimizedPoses.end() && poses.find(iterPose->first) == poses.end())
                        {
                                poses.insert(*iterPose);
                                // make the poses in the map fixed
                                constraints.insert(std::make_pair(iterPose->first, Link(iterPose->first, iterPose->first, Link::kPosePrior, iterPose->second, cv::Mat::eye(6,6, CV_64FC1)*999999)));
                        }
                }
 
                std::map<int, Transform> posesOut;
                std::multimap<int, Link> edgeConstraintsOut;
                bool priorsIgnored = _graphOptimizer->priorsIgnored();
                _graphOptimizer->setPriorsIgnored(false); //temporary set false to use priors above to fix nodes of the map
                _graphOptimizer->getConnectedGraph(newestId, poses, constraints, posesOut, edgeConstraintsOut);
                std::map<int, Transform> optPoses = _graphOptimizer->optimize(poses.begin()->first, posesOut, edgeConstraintsOut);
                _graphOptimizer->setPriorsIgnored(priorsIgnored); // set back
 
                bool rejectLocalization = false;
                if(optPoses.empty())
                {
                        UWARN("Optimization failed, rejecting localization!");
                        rejectLocalization = true;
                }
                else
                {
                        UINFO("Compute max graph errors...");
                        float maxLinearError = 0.0f;
                        float maxLinearErrorRatio = 0.0f;
                        float maxAngularError = 0.0f;
                        float maxAngularErrorRatio = 0.0f;
                        const Link * maxLinearLink = 0;
                        const Link * maxAngularLink = 0;
                        graph::computeMaxGraphErrors(
                                        optPoses,
                                        edgeConstraintsOut,
                                        maxLinearErrorRatio,
                                        maxAngularErrorRatio,
                                        maxLinearError,
                                        maxAngularError,
                                        &maxLinearLink,
                                        &maxAngularLink,
                                        _graphOptimizer->isSlam2d());
                        if(maxLinearLink == 0 && maxAngularLink==0)
                        {
                                UWARN("Could not compute graph errors! Wrong loop closures could be accepted!");
                        }
 
                        if(maxLinearLink)
                        {
                                UINFO("Max optimization linear error = %f m (link %d->%d, var=%f, ratio error/std=%f)", maxLinearError, maxLinearLink->from(), maxLinearLink->to(), maxLinearLink->transVariance(), maxLinearError/sqrt(maxLinearLink->transVariance()));
                                if(_optimizationMaxError > 0.0f && maxLinearErrorRatio > _optimizationMaxError)
                                {
                                        UWARN("Rejecting localization (%d <-> %d) in this "
                                                        "iteration because a wrong loop closure has been "
                                                        "detected after graph optimization, resulting in "
                                                        "a maximum graph error ratio of %f (edge %d->%d, type=%d, abs error=%f m, stddev=%f). The "
                                                        "maximum error ratio parameter \"%s\" is %f of std deviation.",
                                                        link.from(),
                                                        link.to(),
                                                        maxLinearErrorRatio,
                                                        maxLinearLink->from(),
                                                        maxLinearLink->to(),
                                                        maxLinearLink->type(),
                                                        maxLinearError,
                                                        sqrt(maxLinearLink->transVariance()),
                                                        Parameters::kRGBDOptimizeMaxError().c_str(),
                                                        _optimizationMaxError);
                                        rejectLocalization = true;
                                }
                                else if(_optimizationMaxError == 0.0f && maxLinearErrorRatio>100 && !_graphOptimizer->isRobust())
                                {
                                        UERROR("Huge optimization error detected!"
                                                        "Linear error ratio of %f (edge %d->%d, type=%d, abs error=%f m, stddev=%f). You may consider "
                                                        "enabling \"%s\" to reject those bad optimizations by setting it to a non null value!",
                                                        maxLinearErrorRatio,
                                                        maxLinearLink->from(),
                                                        maxLinearLink->to(),
                                                        maxLinearLink->type(),
                                                        maxLinearError,
                                                        sqrt(maxLinearLink->transVariance()),
                                                        Parameters::kRGBDOptimizeMaxError().c_str());
                                }
                        }
                        if(maxAngularLink)
                        {
                                UINFO("Max optimization angular error = %f deg (link %d->%d, var=%f, ratio error/std=%f)", maxAngularError*180.0f/CV_PI, maxAngularLink->from(), maxAngularLink->to(), maxAngularLink->rotVariance(), maxAngularError/sqrt(maxAngularLink->rotVariance()));
                                if(_optimizationMaxError > 0.0f && maxAngularErrorRatio > _optimizationMaxError)
                                {
                                        UWARN("Rejecting localization (%d <-> %d) in this "
                                                        "iteration because a wrong loop closure has been "
                                                        "detected after graph optimization, resulting in "
                                                        "a maximum graph error ratio of %f (edge %d->%d, type=%d, abs error=%f deg, stddev=%f). The "
                                                        "maximum error ratio parameter \"%s\" is %f of std deviation.",
                                                        link.from(),
                                                        link.to(),
                                                        maxAngularErrorRatio,
                                                        maxAngularLink->from(),
                                                        maxAngularLink->to(),
                                                        maxAngularLink->type(),
                                                        maxAngularError*180.0f/CV_PI,
                                                        sqrt(maxAngularLink->rotVariance()),
                                                        Parameters::kRGBDOptimizeMaxError().c_str(),
                                                        _optimizationMaxError);
                                        rejectLocalization = true;
                                }
                                else if(_optimizationMaxError == 0.0f && maxAngularErrorRatio>100 && !_graphOptimizer->isRobust())
                                {
                                        UERROR("Huge optimization error detected!"
                                                        "Angular error ratio of %f (edge %d->%d, type=%d, abs error=%f m, stddev=%f). You may consider "
                                                        "enabling \"%s\" to reject those bad optimizations by setting it to a non null value!",
                                                        maxAngularErrorRatio,
                                                        maxAngularLink->from(),
                                                        maxAngularLink->to(),
                                                        maxAngularLink->type(),
                                                        maxAngularError*180.0f/CV_PI,
                                                        sqrt(maxAngularLink->rotVariance()),
                                                        Parameters::kRGBDOptimizeMaxError().c_str());
                                }
                        }
                }
 
                if(!rejectLocalization)
                {
                        Transform newOptPoseInv = optPoses.at(link.from()).inverse();
                        Transform newT = newOptPoseInv * optPoses.at(link.to());
                        Link linkTmp = link;
                        linkTmp.setTransform(newT);
                        if(oldestId == link.from())
                        {
                                _lastLocalizationPose = _optimizedPoses.at(link.from()) * linkTmp.transform();
                                _odomCacheConstraints.insert(std::make_pair(linkTmp.to(), linkTmp.inverse()));
                        }
                        else
                        {
                                _lastLocalizationPose = _optimizedPoses.at(link.to()) * linkTmp.transform().inverse();
                                _odomCacheConstraints.insert(std::make_pair(linkTmp.from(), linkTmp));
                        }
                        UINFO("Set _lastLocalizationPose=%s", _lastLocalizationPose.prettyPrint().c_str());
                        if(_graphOptimizer->isSlam2d())
                        {
                                // transform constraint to 2D
                                _lastLocalizationPose = _lastLocalizationPose.to3DoF();
                        }
                        Transform odomPose = _odomCachePoses.find(newestId)->second;
                        _mapCorrection = _lastLocalizationPose * odomPose.inverse();
                        _lastLocalizationNodeId = oldestId;
                        return true;
                }
        }
        return false;
}
 
cv::Mat Rtabmap::getInformation(const cv::Mat & covariance) const
{
        cv::Mat information = covariance.inv();
        if(_loopCovLimited)
        {
                const std::vector<double> & odomMaxInf = _memory->getOdomMaxInf();
                if(odomMaxInf.size() == 6)
                {
                        for(int i=0; i<6; ++i)
                        {
                                if(information.at<double>(i,i) > odomMaxInf[i])
                                {
                                        information.at<double>(i,i) = odomMaxInf[i];
                                }
                        }
                }
        }
        return information;
}
 
void Rtabmap::addNodesToRepublish(const std::vector<int> & ids)
{
        if(ids.empty())
        {
                _nodesToRepublish.clear();
        }
        else if(_maxRepublished > 0 && _publishLastSignatureData)
        {
                _nodesToRepublish.insert(ids.begin(), ids.end());
        }
        else if(_maxRepublished == 0)
        {
                UWARN("%s=0, so cannot republish the %d requested nodes.", Parameters::kRtabmapMaxRepublished().c_str(), (int)ids.size());
        }
        else //_publishLastSignatureData=false
        {
                UWARN("%s=false, so cannot republish the %d requested nodes.", Parameters::kRtabmapPublishLastSignature().c_str(), (int)ids.size());
        }
}
 
void Rtabmap::clearPath(int status)
{
        UINFO("status=%d", status);
        _pathStatus = status;
        _path.clear();
        _pathCurrentIndex=0;
        _pathGoalIndex = 0;
        _pathTransformToGoal.setIdentity();
        _pathUnreachableNodes.clear();
        _pathStuckCount = 0;
        _pathStuckDistance = 0.0f;
        if(_memory)
        {
                _memory->removeAllVirtualLinks();
        }
}
 
// return true if path is updated
bool Rtabmap::computePath(int targetNode, bool global)
{
        this->clearPath(0);
 
        if(targetNode>0)
        {
                UINFO("Planning a path to node %d (global=%d)", targetNode, global?1:0);
        }
        else
        {
                UINFO("Planning a path to landmark %d (global=%d)", -targetNode, global?1:0);
        }
 
        if(!_rgbdSlamMode)
        {
                UWARN("A path can only be computed in RGBD-SLAM mode");
                return false;
        }
 
        UTimer totalTimer;
        UTimer timer;
        Transform transformToLandmark = Transform::getIdentity();
 
        // No need to optimize the graph
        if(_memory)
        {
                int currentNode = 0;
                if(_memory->isIncremental())
                {
                        if(!_memory->getLastWorkingSignature())
                        {
                                UWARN("Working memory is empty... cannot compute a path");
                                return false;
                        }
                        currentNode = _memory->getLastWorkingSignature()->id();
                }
                else
                {
                        if(_lastLocalizationPose.isNull() || _optimizedPoses.empty())
                        {
                                UWARN("Last localization pose is null or optimized graph is empty... cannot compute a path");
                                return false;
                        }
                        if(_optimizedPoses.begin()->first < 0)
                        {
                                std::map<int, Transform> poses(_optimizedPoses.lower_bound(1), _optimizedPoses.end());
                                currentNode = graph::findNearestNode(poses, _lastLocalizationPose);
                        }
                        else
                        {
                                currentNode = graph::findNearestNode(_optimizedPoses, _lastLocalizationPose);
                        }
                }
                if(currentNode && targetNode)
                {
                        std::list<std::pair<int, Transform> > path = graph::computePath(
                                        currentNode,
                                        targetNode,
                                        _memory,
                                        global,
                                        false,
                                        _pathLinearVelocity,
                                        _pathAngularVelocity);
 
                        //transform in current referential
                        Transform t = uValue(_optimizedPoses, currentNode, Transform::getIdentity());
                        _path.resize(path.size());
                        int oi = 0;
                        for(std::list<std::pair<int, Transform> >::iterator iter=path.begin(); iter!=path.end();++iter)
                        {
                                if(iter->first > 0)
                                {
                                        // just keep nodes in the path
                                        _path[oi].first = iter->first;
                                        _path[oi++].second = t * iter->second;
                                }
                        }
                        _path.resize(oi);
                        if(!_path.empty() && !path.empty() && path.rbegin()->first < 0)
                        {
                                transformToLandmark = _path.back().second.inverse() * t * path.rbegin()->second;
                        }
                }
                else if(currentNode == 0)
                {
                        UWARN("We should be localized before planning.");
                }
        }
        UINFO("Total planning time = %fs (%d nodes, %f m long)", totalTimer.ticks(), (int)_path.size(), graph::computePathLength(_path));
 
        if(_path.size() == 0)
        {
                _path.clear();
                UWARN("Cannot compute a path!");
                return false;
        }
        else
        {
                UINFO("Path generated! Size=%d", (int)_path.size());
                if(ULogger::level() == ULogger::kInfo)
                {
                        std::stringstream stream;
                        for(unsigned int i=0; i<_path.size(); ++i)
                        {
                                stream << _path[i].first;
                                if(i+1 < _path.size())
                                {
                                        stream << " ";
                                }
                        }
                        UINFO("Path = [%s]", stream.str().c_str());
                }
                if(_goalsSavedInUserData)
                {
                        // set goal to latest signature
                        std::string goalStr = uFormat("GOAL:%d", targetNode);
 
                        // use label is exist
                        if(_memory->getSignature(targetNode))
                        {
                                if(!_memory->getSignature(targetNode)->getLabel().empty())
                                {
                                        goalStr = std::string("GOAL:")+_memory->getSignature(targetNode)->getLabel();
                                }
                        }
                        else if(global)
                        {
                                std::map<int, std::string> labels = _memory->getAllLabels();
                                std::map<int, std::string>::iterator iter = labels.find(targetNode);
                                if(iter != labels.end() && !iter->second.empty())
                                {
                                        goalStr = std::string("GOAL:")+labels.at(targetNode);
                                }
                        }
                        setUserData(0, cv::Mat(1, int(goalStr.size()+1), CV_8SC1, (void *)goalStr.c_str()).clone());
                }
                _pathTransformToGoal = transformToLandmark;
 
                updateGoalIndex();
                return _path.size() || _pathStatus > 0;
        }
 
        return false;
}
 
bool Rtabmap::computePath(const Transform & targetPose, float tolerance)
{
        this->clearPath(0);
 
        UINFO("Planning a path to pose %s ", targetPose.prettyPrint().c_str());
        if(tolerance < 0.0f)
        {
                tolerance = _localRadius;
        }
 
        std::list<std::pair<int, Transform> > pathPoses;
 
        if(!_rgbdSlamMode)
        {
                UWARN("This method can only be used in RGBD-SLAM mode");
                return false;
        }
 
        //Find the nearest node
        UTimer timer;
        std::map<int, Transform> nodes = _optimizedPoses;
        std::multimap<int, int> links;
        for(std::map<int, Transform>::iterator iter=nodes.upper_bound(0); iter!=nodes.end(); ++iter)
        {
                const Signature * s = _memory->getSignature(iter->first);
                UASSERT(s);
                for(std::map<int, Link>::const_iterator jter=s->getLinks().begin(); jter!=s->getLinks().end(); ++jter)
                {
                        // only add links for which poses are in "nodes"
                        if(jter->second.from() != jter->second.to() && uContains(nodes, jter->second.to()))
                        {
                                links.insert(std::make_pair(jter->second.from(), jter->second.to()));
                                //links.insert(std::make_pair(jter->second.to(), jter->second.from())); // <-> (commented: already added when iterating in nodes)
                        }
                }
        }
        UINFO("Time getting links = %fs", timer.ticks());
 
        int currentNode = 0;
        if(_memory->isIncremental())
        {
                if(!_memory->getLastWorkingSignature())
                {
                        UWARN("Working memory is empty... cannot compute a path");
                        return false;
                }
                currentNode = _memory->getLastWorkingSignature()->id();
        }
        else
        {
                if(_lastLocalizationPose.isNull() || _optimizedPoses.empty())
                {
                        UWARN("Last localization pose is null... cannot compute a path");
                        return false;
                }
                if(_optimizedPoses.begin()->first < 0)
                {
                        std::map<int, Transform> poses(_optimizedPoses.lower_bound(1), _optimizedPoses.end());
                        currentNode = graph::findNearestNode(poses, _lastLocalizationPose);
                }
                else
                {
                        currentNode = graph::findNearestNode(_optimizedPoses, _lastLocalizationPose);
                }
        }
 
        int nearestId;
        if(!_lastLocalizationPose.isNull() && _lastLocalizationPose.getDistance(targetPose) < tolerance)
        {
                // target can be reached from the current node
                nearestId = currentNode;
        }
        else
        {
                nearestId = rtabmap::graph::findNearestNode(nodes, targetPose);
        }
        UINFO("Nearest node found=%d ,%fs", nearestId, timer.ticks());
        if(nearestId > 0)
        {
                if(tolerance != 0.0f && targetPose.getDistance(nodes.at(nearestId)) > tolerance)
                {
                        UWARN("Cannot plan farther than %f m from the graph! (distance=%f m from node %d)",
                                        tolerance, targetPose.getDistance(nodes.at(nearestId)), nearestId);
                }
                else
                {
                        UINFO("Computing path from location %d to %d", currentNode, nearestId);
                        UTimer timer;
                        _path = uListToVector(rtabmap::graph::computePath(nodes, links, currentNode, nearestId));
                        UINFO("A* time = %fs", timer.ticks());
 
                        if(_path.size() == 0)
                        {
                                UWARN("Cannot compute a path!");
                        }
                        else
                        {
                                UINFO("Path generated! Size=%d", (int)_path.size());
                                if(ULogger::level() == ULogger::kInfo)
                                {
                                        std::stringstream stream;
                                        for(unsigned int i=0; i<_path.size(); ++i)
                                        {
                                                stream << _path[i].first;
                                                if(i+1 < _path.size())
                                                {
                                                        stream << " ";
                                                }
                                        }
                                        UINFO("Path = [%s]", stream.str().c_str());
                                }
 
                                UASSERT(uContains(nodes, _path.back().first));
                                _pathTransformToGoal = nodes.at(_path.back().first).inverse() * targetPose;
 
                                updateGoalIndex();
 
                                return true;
                        }
                }
        }
        else
        {
                UWARN("Nearest node not found in graph (size=%d) for pose %s", (int)nodes.size(), targetPose.prettyPrint().c_str());
        }
 
        return false;
}
 
std::vector<std::pair<int, Transform> > Rtabmap::getPathNextPoses() const
{
        std::vector<std::pair<int, Transform> > poses;
        if(_path.size())
        {
                UASSERT(_pathCurrentIndex < _path.size() && _pathGoalIndex < _path.size());
                poses.resize(_pathGoalIndex-_pathCurrentIndex+1);
                int oi=0;
                for(unsigned int i=_pathCurrentIndex; i<=_pathGoalIndex; ++i)
                {
                        std::map<int, Transform>::const_iterator iter = _optimizedPoses.find(_path[i].first);
                        if(iter != _optimizedPoses.end())
                        {
                                poses[oi++] = *iter;
                        }
                        else
                        {
                                break;
                        }
                }
                poses.resize(oi);
        }
        return poses;
}
 
std::vector<int> Rtabmap::getPathNextNodes() const
{
        std::vector<int> ids;
        if(_path.size())
        {
                UASSERT(_pathCurrentIndex < _path.size() && _pathGoalIndex < _path.size());
                ids.resize(_pathGoalIndex-_pathCurrentIndex+1);
                int oi = 0;
                for(unsigned int i=_pathCurrentIndex; i<=_pathGoalIndex; ++i)
                {
                        std::map<int, Transform>::const_iterator iter = _optimizedPoses.find(_path[i].first);
                        if(iter != _optimizedPoses.end())
                        {
                                ids[oi++] = iter->first;
                        }
                        else
                        {
                                break;
                        }
                }
                ids.resize(oi);
        }
        return ids;
}
 
int Rtabmap::getPathCurrentGoalId() const
{
        if(_path.size())
        {
                UASSERT(_pathGoalIndex <= _path.size());
                return _path[_pathGoalIndex].first;
        }
        return 0;
}
 
void Rtabmap::updateGoalIndex()
{
        if(!_rgbdSlamMode)
        {
                UWARN("This method can on be used in RGBD-SLAM mode!");
                return;
        }
 
        if( _memory && _path.size())
        {
                // remove all previous virtual links
                for(unsigned int i=0; i<_pathCurrentIndex && i<_path.size(); ++i)
                {
                        const Signature * s = _memory->getSignature(_path[i].first);
                        if(s)
                        {
                                _memory->removeVirtualLinks(s->id());
                        }
                }
 
                // for the current index, only keep the newest virtual link
                // This will make sure that the path is still connected even
                // if the new signature is removed (e.g., because of a small displacement)
                UASSERT(_pathCurrentIndex < _path.size());
                const Signature * currentIndexS = _memory->getSignature(_path[_pathCurrentIndex].first);
                UASSERT_MSG(currentIndexS != 0, uFormat("_path[%d].first=%d", _pathCurrentIndex, _path[_pathCurrentIndex].first).c_str());
                std::multimap<int, Link> links = currentIndexS->getLinks(); // make a copy
                bool latestVirtualLinkFound = false;
                for(std::multimap<int, Link>::reverse_iterator iter=links.rbegin(); iter!=links.rend(); ++iter)
                {
                        if(iter->second.type() == Link::kVirtualClosure)
                        {
                                if(latestVirtualLinkFound)
                                {
                                        _memory->removeLink(currentIndexS->id(), iter->first);
                                }
                                else
                                {
                                        latestVirtualLinkFound = true;
                                }
                        }
                }
 
                // Make sure the next signatures on the path are linked together
                float distanceSoFar = 0.0f;
                for(unsigned int i=_pathCurrentIndex+1;
                        i<_path.size();
                        ++i)
                {
                        if(i>0)
                        {
                                if(_localRadius > 0.0f)
                                {
                                        distanceSoFar += _path[i-1].second.getDistance(_path[i].second);
                                }
                                if(distanceSoFar <= _localRadius)
                                {
                                        if(_path[i].first != _path[i-1].first)
                                        {
                                                const Signature * s = _memory->getSignature(_path[i].first);
                                                if(s)
                                                {
                                                        if(!s->hasLink(_path[i-1].first) && _memory->getSignature(_path[i-1].first) != 0)
                                                        {
                                                                Transform virtualLoop = _path[i].second.inverse() * _path[i-1].second;
                                                                _memory->addLink(Link(_path[i].first, _path[i-1].first, Link::kVirtualClosure, virtualLoop, cv::Mat::eye(6,6,CV_64FC1)*0.01)); // on the optimized path
                                                                UINFO("Added Virtual link between %d and %d", _path[i-1].first, _path[i].first);
                                                        }
                                                }
                                        }
                                }
                                else
                                {
                                        break;
                                }
                        }
                }
 
                UDEBUG("current node = %d current goal = %d", _path[_pathCurrentIndex].first, _path[_pathGoalIndex].first);
                Transform currentPose;
                if(_memory->isIncremental())
                {
                        if(_memory->getLastWorkingSignature() == 0 ||
                           !uContains(_optimizedPoses, _memory->getLastWorkingSignature()->id()))
                        {
                                UERROR("Last node is null in memory or not in optimized poses. Aborting the plan...");
                                this->clearPath(-1);
                                return;
                        }
                        currentPose = _optimizedPoses.at(_memory->getLastWorkingSignature()->id());
                }
                else
                {
                        if(_lastLocalizationPose.isNull())
                        {
                                UERROR("Last localization pose is null. Aborting the plan...");
                                this->clearPath(-1);
                                return;
                        }
                        currentPose = _lastLocalizationPose;
                }
 
                int goalId = _path.back().first;
                if(uContains(_optimizedPoses, goalId))
                {
                        //use local position to know if the goal is reached
                        float d = currentPose.getDistance(_optimizedPoses.at(goalId)*_pathTransformToGoal);
                        if(d < _goalReachedRadius)
                        {
                                UINFO("Goal %d reached!", goalId);
                                this->clearPath(1);
                        }
                }
 
                if(_path.size())
                {
                        //Always check if the farthest node is accessible in local map (max to local space radius if set)
                        unsigned int goalIndex = _pathCurrentIndex;
                        float distanceFromCurrentNode = 0.0f;
                        bool sameGoalIndex = false;
                        for(unsigned int i=_pathCurrentIndex+1; i<_path.size(); ++i)
                        {
                                if(uContains(_optimizedPoses, _path[i].first))
                                {
                                        if(_localRadius > 0.0f)
                                        {
                                                distanceFromCurrentNode = _path[_pathCurrentIndex].second.getDistance(_path[i].second);
                                        }
 
                                        if((goalIndex == _pathCurrentIndex && i == _path.size()-1) ||
                                           _pathUnreachableNodes.find(i) == _pathUnreachableNodes.end())
                                        {
                                                if(distanceFromCurrentNode <= _localRadius)
                                                {
                                                        goalIndex = i;
                                                }
                                                else
                                                {
                                                        break;
                                                }
                                        }
                                }
                                else
                                {
                                        break;
                                }
                        }
                        UASSERT(_pathGoalIndex < _path.size() && goalIndex < _path.size());
                        if(_pathGoalIndex != goalIndex)
                        {
                                UINFO("Updated current goal from %d to %d (%d/%d)",
                                                (int)_path[_pathGoalIndex].first, _path[goalIndex].first, (int)goalIndex+1, (int)_path.size());
                                _pathGoalIndex = goalIndex;
                        }
                        else
                        {
                                sameGoalIndex = true;
                        }
 
                        // update nearest pose in the path
                        unsigned int nearestNodeIndex = 0;
                        float distance = -1.0f;
                        bool sameCurrentIndex = false;
                        UASSERT(_pathGoalIndex < _path.size());
                        for(unsigned int i=_pathCurrentIndex; i<=_pathGoalIndex; ++i)
                        {
                                std::map<int, Transform>::iterator iter = _optimizedPoses.find(_path[i].first);
                                if(iter != _optimizedPoses.end())
                                {
                                        float d = currentPose.getDistanceSquared(iter->second);
                                        if(distance == -1.0f || distance > d)
                                        {
                                                distance = d;
                                                nearestNodeIndex = i;
                                        }
                                }
                        }
                        if(distance < 0)
                        {
                                UERROR("The nearest pose on the path not found! Aborting the plan...");
                                this->clearPath(-1);
                        }
                        else
                        {
                                UDEBUG("Nearest node = %d", _path[nearestNodeIndex].first);
                        }
                        if(distance >= 0 && nearestNodeIndex != _pathCurrentIndex)
                        {
                                _pathCurrentIndex = nearestNodeIndex;
                                _pathUnreachableNodes.erase(nearestNodeIndex); // if we are on it, it is reachable
                        }
                        else
                        {
                                sameCurrentIndex = true;
                        }
 
                        bool isStuck = false;
                        if(sameGoalIndex && sameCurrentIndex && _pathStuckIterations>0)
                        {
                                float distanceToCurrentGoal = 0.0f;
                                std::map<int, Transform>::iterator iter = _optimizedPoses.find(_path[_pathGoalIndex].first);
                                if(iter != _optimizedPoses.end())
                                {
                                        if(_pathGoalIndex == _pathCurrentIndex &&
                                                _pathGoalIndex == _path.size()-1)
                                        {
                                                distanceToCurrentGoal = currentPose.getDistanceSquared(iter->second*_pathTransformToGoal);
                                        }
                                        else
                                        {
                                                distanceToCurrentGoal = currentPose.getDistanceSquared(iter->second);
                                        }
                                }
 
                                if(distanceToCurrentGoal > 0.0f)
                                {
                                        if(distanceToCurrentGoal >= _pathStuckDistance)
                                        {
                                                // we are not approaching the goal
                                                isStuck = true;
                                                if(_pathStuckDistance == 0.0f)
                                                {
                                                        _pathStuckDistance = distanceToCurrentGoal;
                                                }
                                        }
                                }
                                else
                                {
                                        // no nodes available, cannot plan
                                        isStuck = true;
                                }
                        }
 
                        if(isStuck && ++_pathStuckCount > _pathStuckIterations)
                        {
                                UWARN("Current goal %d not reached since %d iterations (\"RGBD/PlanStuckIterations\"=%d), mark that node as unreachable.",
                                                _path[_pathGoalIndex].first,
                                                _pathStuckCount,
                                                _pathStuckIterations);
                                _pathStuckCount = 0;
                                _pathStuckDistance = 0.0;
                                _pathUnreachableNodes.insert(_pathGoalIndex);
                                // select previous reachable one
                                while(_pathUnreachableNodes.find(_pathGoalIndex) != _pathUnreachableNodes.end())
                                {
                                        if(_pathGoalIndex == 0 || --_pathGoalIndex <= _pathCurrentIndex)
                                        {
                                                // plan failed!
                                                UERROR("No upcoming nodes on the path are reachable! Aborting the plan...");
                                                this->clearPath(-1);
                                                return;
                                        }
                                }
                        }
                        else if(!isStuck)
                        {
                                _pathStuckCount = 0;
                                _pathStuckDistance = 0.0;
                        }
                }
        }
}
 
void Rtabmap::createGlobalScanMap()
{
        UDEBUG("Creating global scan map (if scans are available)");
        _globalScanMap.clear();
        _globalScanMapPoses.clear();
        std::vector<int> scanIndices;
        std::map<int, Transform> scanViewpoints;
        for(std::map<int, Transform>::iterator iter=_optimizedPoses.begin(); iter!=_optimizedPoses.end(); ++iter)
        {
                SensorData data = _memory->getNodeData(iter->first, false, true, false, false);
                if(!data.laserScanCompressed().empty())
                {
                        LaserScan scan;
                        data.uncompressDataConst(0, 0, &scan, 0, 0, 0, 0);
                        if(!scan.empty())
                        {
                                UDEBUG("Adding scan %d (format=%s, points=%d)", iter->first, scan.formatName().c_str(), scan.size());
                                scan = util3d::transformLaserScan(scan, iter->second*scan.localTransform());
                                if(_globalScanMap.empty() || _globalScanMap.format() == scan.format())
                                {
                                        _globalScanMap += scan;
                                        _globalScanMapPoses.insert(*iter);
                                        scanViewpoints.insert(std::make_pair(iter->first, iter->second * scan.localTransform()));
                                        scanIndices.resize(_globalScanMap.size(), iter->first);
                                }
                                else
                                {
                                        UWARN("Incompatible scan formats (%s vs %s), cannot create global scan map.",
                                                        _globalScanMap.formatName().c_str(),
                                                        scan.formatName().c_str());
                                        _globalScanMap.clear();
                                        _globalScanMapPoses.clear();
                                        break;
                                }
                        }
                        else
                        {
                                UDEBUG("Ignored %d (scan is empty), pose still added.", iter->first);
                                _globalScanMapPoses.insert(*iter);
                        }
                }
                else
                {
                        UDEBUG("Ignored %d (no scan), pose still added.", iter->first);
                        _globalScanMapPoses.insert(*iter);
                }
        }
        if(_globalScanMap.size() > 3)
        {
                float voxelSize = 0.0f;
                int normalK = 0;
                float normalRadius = 0.0f;
                Parameters::parse(_parameters, Parameters::kMemLaserScanVoxelSize(), voxelSize);
                Parameters::parse(_parameters, Parameters::kMemLaserScanNormalK(), normalK);
                Parameters::parse(_parameters, Parameters::kMemLaserScanNormalRadius(), normalRadius);
 
                if(voxelSize > 0.0f)
                {
                        LaserScan voxelScan = util3d::commonFiltering(_globalScanMap, 1, 0, 0, voxelSize, normalK, normalRadius);
                        if(voxelScan.hasNormals())
                        {
                                // adjust with point of views
                                util3d::adjustNormalsToViewPoints(
                                                scanViewpoints,
                                                _globalScanMap,
                                                scanIndices,
                                                voxelScan);
                        }
                        _globalScanMap = voxelScan;
                }
 
                UINFO("Global scan map has been assembled (size=%d points, %d poses) "
                                "for proximity detection (only in localization mode %s=false and with %s=true)",
                                (int)_globalScanMap.size(),
                                (int)_globalScanMapPoses.size(),
                                Parameters::kMemIncrementalMemory().c_str(),
                                Parameters::kRGBDProximityGlobalScanMap().c_str());
 
                //for debugging...
                if(!_globalScanMap.empty() && ULogger::level() == ULogger::kDebug)
                {
                        if(!_wDir.empty())
                        {
                                UWARN("Saving %s/rtabmap_global_scan_map.pcd (only saved when logger level is debug)", _wDir.c_str());
                                pcl::PCLPointCloud2::Ptr cloud2 = util3d::laserScanToPointCloud2(_globalScanMap);
                                pcl::io::savePCDFile(_wDir+"/rtabmap_global_scan_map.pcd", *cloud2);
                        }
                        else
                        {
                                UWARN("%s is enabled and logger is debug, but %s is not set, cannot save global scan map for debugging.",
                                                Parameters::kRGBDProximityGlobalScanMap().c_str(), Parameters::kRtabmapWorkingDirectory().c_str());
                        }
                }
        }
        if(!_globalScanMap.empty() && _globalScanMap.size()<100)
        {
                UWARN("Ignoring global scan map because it is too small (%d points).", (int)_globalScanMap.size());
                _globalScanMap.clear();
                _globalScanMapPoses.clear();
        }
}
 
} // namespace rtabmap