testCustomChartExpression.cpp
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1 /* ----------------------------------------------------------------------------
2 
3  * GTSAM Copyright 2010, Georgia Tech Research Corporation,
4  * Atlanta, Georgia 30332-0415
5  * All Rights Reserved
6  * Authors: Frank Dellaert, et al. (see THANKS for the full author list)
7 
8  * See LICENSE for the license information
9 
10  * -------------------------------1------------------------------------------- */
11 
20 #include <gtsam_unstable/nonlinear/expressionTesting.h>
22 #include <type_traits>
23 
24 
25 using namespace gtsam;
26 
27 // A simple prototype custom chart that does two things:
28 // 1. it reduces the dimension of the variable being estimated
29 // 2. it scales the input to retract.
30 //
31 // The Jacobian of this chart is:
32 // [ 2 0 ]
33 // [ 0 3 ]
34 // [ 0 0 ]
36  typedef Eigen::Vector3d type;
37  typedef Eigen::Vector2d vector;
38  static vector local(const type& origin, const type& other) {
39  return (other - origin).head<2>();
40  }
41  static type retract(const type& origin, const vector& d) {
42  return origin + Eigen::Vector3d(2.0 * d[0], 3.0 * d[1], 0.0);
43  }
44  static int getDimension(const type& origin) {
45  return 2;
46  }
47 };
48 
49 namespace gtsam {
50 namespace traits {
51 template<> struct is_chart<ProjectionChart> : public std::true_type {};
52 template<> struct dimension<ProjectionChart> : public std::integral_constant<int, 2> {};
53 } // namespace traits
54 } // namespace gtsam
55 
56 TEST(ExpressionCustomChart, projection) {
57  // Create expression
59 
60  Eigen::Vector3d pval(1.0, 2.0, 3.0);
61  Values standard;
62  standard.insert(1, pval);
63 
64  Values custom;
65  custom.insert(1, pval, ProjectionChart());
66 
67  Eigen::Vector3d pstandard = point.value(standard);
68  Eigen::Vector3d pcustom = point.value(custom);
69 
70  // The values should be the same.
71  EXPECT(assert_equal(Matrix(pstandard), Matrix(pcustom), 1e-10));
72 
73 
74  EXPECT_LONGS_EQUAL(3, standard.at(1).dim());
75  VectorValues vstandard = standard.zeroVectors();
76  EXPECT_LONGS_EQUAL(3, vstandard.at(1).size());
77 
78 
79  EXPECT_LONGS_EQUAL(2, custom.at(1).dim());
80  VectorValues vcustom = custom.zeroVectors();
81  EXPECT_LONGS_EQUAL(2, vcustom.at(1).size());
82 
84 
85  std::shared_ptr<GaussianFactor> gfstandard = f.linearize(standard);
86  std::shared_ptr<JacobianFactor> jfstandard = //
87  std::dynamic_pointer_cast<JacobianFactor>(gfstandard);
88 
89  typedef std::pair<Eigen::MatrixXd, Eigen::VectorXd> Jacobian;
90  Jacobian Jstandard = jfstandard->jacobianUnweighted();
91  EXPECT(assert_equal(Eigen::Matrix3d::Identity(), Jstandard.first, 1e-10));
92 
93  std::shared_ptr<GaussianFactor> gfcustom = f.linearize(custom);
94  std::shared_ptr<JacobianFactor> jfcustom = //
95  std::dynamic_pointer_cast<JacobianFactor>(gfcustom);
96 
97  Eigen::MatrixXd expectedJacobian = Eigen::MatrixXd::Zero(3,2);
98  expectedJacobian(0,0) = 2.0;
99  expectedJacobian(1,1) = 3.0;
100  Jacobian Jcustom = jfcustom->jacobianUnweighted();
101  EXPECT(assert_equal(expectedJacobian, Jcustom.first, 1e-10));
102 
103  // Amazingly, the finite differences get the expected Jacobian right.
104  const double fd_step = 1e-5;
105  const double tolerance = 1e-5;
106  EXPECT_CORRECT_EXPRESSION_JACOBIANS(point, custom, fd_step, tolerance);
107 }
108 
109 /* ************************************************************************* */
110 int main() {
111  TestResult tr;
112  return TestRegistry::runAllTests(tr);
113 }
114 /* ************************************************************************* */
115 
TestRegistry::runAllTests
static int runAllTests(TestResult &result)
Definition: TestRegistry.cpp:27
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Definition: igam.h:11
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#define EXPECT_LONGS_EQUAL(expected, actual)
Definition: Test.h:154
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Definition: Test.h:150
TestHarness.h
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Vector & at(Key j)
Definition: VectorValues.h:142
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Definition: testCustomChartExpression.cpp:37
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Definition: base/Matrix.h:39
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Definition: Expression.h:47
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Definition: testCustomChartExpression.cpp:44
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Definition: test_ProjectionFactorRollingShutter.py:25
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Definition: testCustomChartExpression.cpp:36
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Definition: testCustomChartExpression.cpp:110
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Definition: testCustomChartExpression.cpp:41
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Definition: expressionTesting.h:48
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Definition: testCustomChartExpression.cpp:38
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