145 lines
4.7 KiB
C++
145 lines
4.7 KiB
C++
/* ----------------------------------------------------------------------------
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* GTSAM Copyright 2010, Georgia Tech Research Corporation,
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* Atlanta, Georgia 30332-0415
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* All Rights Reserved
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* Authors: Frank Dellaert, et al. (see THANKS for the full author list)
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* See LICENSE for the license information
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* -------------------------------------------------------------------------- */
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/**
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* @file testIterative.cpp
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* @brief Unit tests for iterative methods
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* @author Frank Dellaert
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**/
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#include <tests/smallExample.h>
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#include <gtsam/slam/PriorFactor.h>
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#include <gtsam/slam/BetweenFactor.h>
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#include <gtsam/nonlinear/NonlinearEquality.h>
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#include <gtsam/inference/Symbol.h>
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#include <gtsam/linear/iterative.h>
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#include <gtsam/geometry/Pose2.h>
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#include <CppUnitLite/TestHarness.h>
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using namespace std;
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using namespace gtsam;
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using namespace example;
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using symbol_shorthand::X; // to create pose keys
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using symbol_shorthand::L; // to create landmark keys
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static ConjugateGradientParameters parameters;
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// add following below to add printing:
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// parameters.verbosity_ = ConjugateGradientParameters::COMPLEXITY;
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/* ************************************************************************* */
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TEST( Iterative, steepestDescent )
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{
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// Create factor graph
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GaussianFactorGraph fg = createGaussianFactorGraph();
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// eliminate and solve
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VectorValues expected = fg.optimize();
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// Do gradient descent
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VectorValues zero = VectorValues::Zero(expected); // TODO, how do we do this normally?
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VectorValues actual = steepestDescent(fg, zero, parameters);
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CHECK(assert_equal(expected,actual,1e-2));
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}
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/* ************************************************************************* */
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TEST( Iterative, conjugateGradientDescent )
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{
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// Create factor graph
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GaussianFactorGraph fg = createGaussianFactorGraph();
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// eliminate and solve
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VectorValues expected = fg.optimize();
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// get matrices
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Matrix A;
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Vector b;
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Vector x0 = gtsam::zero(6);
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boost::tie(A, b) = fg.jacobian();
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Vector expectedX = (Vector(6) << -0.1, 0.1, -0.1, -0.1, 0.1, -0.2);
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// Do conjugate gradient descent, System version
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System Ab(A, b);
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Vector actualX = conjugateGradientDescent(Ab, x0, parameters);
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CHECK(assert_equal(expectedX,actualX,1e-9));
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// Do conjugate gradient descent, Matrix version
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Vector actualX2 = conjugateGradientDescent(A, b, x0, parameters);
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CHECK(assert_equal(expectedX,actualX2,1e-9));
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// Do conjugate gradient descent on factor graph
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VectorValues zero = VectorValues::Zero(expected);
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VectorValues actual = conjugateGradientDescent(fg, zero, parameters);
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CHECK(assert_equal(expected,actual,1e-2));
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}
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/* ************************************************************************* */
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TEST( Iterative, conjugateGradientDescent_hard_constraint )
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{
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Values config;
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Pose2 pose1 = Pose2(0.,0.,0.);
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config.insert(X(1), pose1);
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config.insert(X(2), Pose2(1.5,0.,0.));
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NonlinearFactorGraph graph;
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graph += NonlinearEquality<Pose2>(X(1), pose1);
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graph += BetweenFactor<Pose2>(X(1),X(2), Pose2(1.,0.,0.), noiseModel::Isotropic::Sigma(3, 1));
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boost::shared_ptr<GaussianFactorGraph> fg = graph.linearize(config);
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VectorValues zeros = config.zeroVectors();
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ConjugateGradientParameters parameters;
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parameters.setEpsilon_abs(1e-3);
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parameters.setEpsilon_rel(1e-5);
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parameters.setMaxIterations(100);
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VectorValues actual = conjugateGradientDescent(*fg, zeros, parameters);
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VectorValues expected;
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expected.insert(X(1), zero(3));
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expected.insert(X(2), (Vector(3) << -0.5,0.,0.));
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CHECK(assert_equal(expected, actual));
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}
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/* ************************************************************************* */
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TEST( Iterative, conjugateGradientDescent_soft_constraint )
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{
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Values config;
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config.insert(X(1), Pose2(0.,0.,0.));
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config.insert(X(2), Pose2(1.5,0.,0.));
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NonlinearFactorGraph graph;
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graph += PriorFactor<Pose2>(X(1), Pose2(0.,0.,0.), noiseModel::Isotropic::Sigma(3, 1e-10));
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graph += BetweenFactor<Pose2>(X(1),X(2), Pose2(1.,0.,0.), noiseModel::Isotropic::Sigma(3, 1));
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boost::shared_ptr<GaussianFactorGraph> fg = graph.linearize(config);
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VectorValues zeros = config.zeroVectors();
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ConjugateGradientParameters parameters;
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parameters.setEpsilon_abs(1e-3);
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parameters.setEpsilon_rel(1e-5);
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parameters.setMaxIterations(100);
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VectorValues actual = conjugateGradientDescent(*fg, zeros, parameters);
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VectorValues expected;
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expected.insert(X(1), zero(3));
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expected.insert(X(2), (Vector(3) << -0.5,0.,0.));
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CHECK(assert_equal(expected, actual));
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}
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/* ************************************************************************* */
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int main() {
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TestResult tr;
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return TestRegistry::runAllTests(tr);
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}
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/* ************************************************************************* */
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