ConcurrentIncrementalFilter.h

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/* ----------------------------------------------------------------------------

 * GTSAM Copyright 2010, Georgia Tech Research Corporation,
 * Atlanta, Georgia 30332-0415
 * All Rights Reserved
 * Authors: Frank Dellaert, et al. (see THANKS for the full author list)

 * See LICENSE for the license information

 * -------------------------------------------------------------------------- */

// \callgraph
#pragma once

#include <gtsam_unstable/nonlinear/ConcurrentFilteringAndSmoothing.h>
#include <gtsam/nonlinear/ISAM2.h>

namespace gtsam {

class GTSAM_UNSTABLE_EXPORT ConcurrentIncrementalFilter : public virtual ConcurrentFilter {

public:

  typedef std::shared_ptr<ConcurrentIncrementalFilter> shared_ptr;
  typedef ConcurrentFilter Base; 

  struct Result {
    size_t iterations; 
    size_t nonlinearVariables; 
    size_t linearVariables; 
    size_t variablesReeliminated;
    size_t variablesRelinearized;

    FactorIndices newFactorsIndices;

    double error; 

    Result() : iterations(0), nonlinearVariables(0), linearVariables(0), error(0) {}

    size_t getIterations() const { return iterations; }
    size_t getNonlinearVariables() const { return nonlinearVariables; }
    size_t getLinearVariables() const { return linearVariables; }
    double getError() const { return error; }
  };

  ConcurrentIncrementalFilter(const ISAM2Params& parameters = ISAM2Params()) : isam2_(parameters) {}

  ~ConcurrentIncrementalFilter() override {}

  void print(const std::string& s = "Concurrent Incremental Filter:\n", const KeyFormatter& keyFormatter = DefaultKeyFormatter) const override;

  bool equals(const ConcurrentFilter& rhs, double tol = 1e-9) const override;

  const NonlinearFactorGraph& getFactors() const {
    return isam2_.getFactorsUnsafe();
  }

  const ISAM2& getISAM2() const {
    return isam2_;
  }

  const Values& getLinearizationPoint() const {
    return isam2_.getLinearizationPoint();
  }

  const VectorValues& getDelta() const {
    return isam2_.getDelta();
  }

  Values calculateEstimate() const {
    return isam2_.calculateEstimate();
  }

  template<class VALUE>
  VALUE calculateEstimate(Key key) const {
    return isam2_.calculateEstimate<VALUE>(key);
  }

  Result update(const NonlinearFactorGraph& newFactors = NonlinearFactorGraph(), const Values& newTheta = Values(),
      const std::optional<FastList<Key> >& keysToMove = {},
      const std::optional< FactorIndices >& removeFactorIndices = {});

  void presync() override;

  void getSummarizedFactors(NonlinearFactorGraph& filterSummarization, Values& filterSummarizationValues) override;

  void getSmootherFactors(NonlinearFactorGraph& smootherFactors, Values& smootherValues) override;

  void synchronize(const NonlinearFactorGraph& smootherSummarization, const Values& smootherSummarizationValues) override;

  void postsync() override;

protected:

  ISAM2 isam2_; 

  // ???
  NonlinearFactorGraph previousSmootherSummarization_; 
  FactorIndices currentSmootherSummarizationSlots_;  
  NonlinearFactorGraph smootherShortcut_; 

  // Storage for information to be sent to the smoother
  NonlinearFactorGraph smootherFactors_;  
  Values smootherValues_; 

private:

  static void RecursiveMarkAffectedKeys(const Key& key, const ISAM2Clique::shared_ptr& clique, std::set<Key>& additionalKeys);

  static FactorIndices FindAdjacentFactors(const ISAM2& isam2, const FastList<Key>& keys, const FactorIndices& factorsToIgnore);

  // TODO: Make this a static function
  void updateShortcut(const NonlinearFactorGraph& removedFactors);

  // TODO: Make this a static function
  NonlinearFactorGraph calculateFilterSummarization() const;

}; // ConcurrentBatchFilter

typedef ConcurrentIncrementalFilter::Result ConcurrentIncrementalFilterResult;

template<>
struct traits<ConcurrentIncrementalFilter> : public Testable<ConcurrentIncrementalFilter> {
};

} //\ namespace gtsam