internal/ceres/solver_impl_test.cc - ceres-solver - Git at Google

 // Ceres Solver - A fast non-linear least squares minimizer
 // Copyright 2010, 2011, 2012 Google Inc. All rights reserved.
 // http://code.google.com/p/ceres-solver/
 //
 // 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 Google Inc. 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 OWNER 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.
 //
 // Author: sameeragarwal@google.com (Sameer Agarwal)

 #include "gtest/gtest.h"
 #include "ceres/linear_solver.h"
 #include "ceres/parameter_block.h"
 #include "ceres/problem_impl.h"
 #include "ceres/program.h"
 #include "ceres/residual_block.h"
 #include "ceres/solver_impl.h"
 #include "ceres/sized_cost_function.h"

 namespace ceres {
 namespace internal {

 // Templated base class for the CostFunction signatures.
 template <int kNumResiduals, int N0, int N1, int N2>
 class MockCostFunctionBase : public
 SizedCostFunction<kNumResiduals, N0, N1, N2> {
  public:
   virtual bool Evaluate(double const* const* parameters,
                         double* residuals,
                         double** jacobians) const {
     // Do nothing. This is never called.
     return true;
   }
 };

 class UnaryCostFunction : public MockCostFunctionBase<2, 1, 0, 0> {};
 class BinaryCostFunction : public MockCostFunctionBase<2, 1, 1, 0> {};
 class TernaryCostFunction : public MockCostFunctionBase<2, 1, 1, 1> {};

 TEST(SolverImpl, RemoveFixedBlocksNothingConstant) {
   ProblemImpl problem;
   double x;
   double y;
   double z;

   problem.AddParameterBlock(&x, 1);
   problem.AddParameterBlock(&y, 1);
   problem.AddParameterBlock(&z, 1);
   problem.AddResidualBlock(new UnaryCostFunction(), NULL, &x);
   problem.AddResidualBlock(new BinaryCostFunction(), NULL, &x, &y);
   problem.AddResidualBlock(new TernaryCostFunction(), NULL, &x, &y, &z);

   string error;
   {
     int num_eliminate_blocks = 0;
     Program program(*problem.mutable_program());
     EXPECT_TRUE(SolverImpl::RemoveFixedBlocksFromProgram(&program,
                                                          &num_eliminate_blocks,
                                                          &error));
     EXPECT_EQ(program.NumParameterBlocks(), 3);
     EXPECT_EQ(program.NumResidualBlocks(), 3);
     EXPECT_EQ(num_eliminate_blocks, 0);
   }

   // Check that num_eliminate_blocks is preserved, when it contains
   // all blocks.
   {
     int num_eliminate_blocks = 3;
     Program program(problem.program());
     EXPECT_TRUE(SolverImpl::RemoveFixedBlocksFromProgram(&program,
                                                          &num_eliminate_blocks,
                                                          &error));
     EXPECT_EQ(program.NumParameterBlocks(), 3);
     EXPECT_EQ(program.NumResidualBlocks(), 3);
     EXPECT_EQ(num_eliminate_blocks, 3);
   }
 }

 TEST(SolverImpl, RemoveFixedBlocksAllParameterBlocksConstant) {
   ProblemImpl problem;
   double x;

   problem.AddParameterBlock(&x, 1);
   problem.AddResidualBlock(new UnaryCostFunction(), NULL, &x);
   problem.SetParameterBlockConstant(&x);

   int num_eliminate_blocks = 0;
   Program program(problem.program());
   string error;
   EXPECT_TRUE(SolverImpl::RemoveFixedBlocksFromProgram(&program,
                                                        &num_eliminate_blocks,
                                                        &error));
   EXPECT_EQ(program.NumParameterBlocks(), 0);
   EXPECT_EQ(program.NumResidualBlocks(), 0);
   EXPECT_EQ(num_eliminate_blocks, 0);
 }

 TEST(SolverImpl, RemoveFixedBlocksNoResidualBlocks) {
   ProblemImpl problem;
   double x;
   double y;
   double z;

   problem.AddParameterBlock(&x, 1);
   problem.AddParameterBlock(&y, 1);
   problem.AddParameterBlock(&z, 1);

   int num_eliminate_blocks = 0;
   Program program(problem.program());
   string error;
   EXPECT_TRUE(SolverImpl::RemoveFixedBlocksFromProgram(&program,
                                                        &num_eliminate_blocks,
                                                        &error));
   EXPECT_EQ(program.NumParameterBlocks(), 0);
   EXPECT_EQ(program.NumResidualBlocks(), 0);
   EXPECT_EQ(num_eliminate_blocks, 0);
 }

 TEST(SolverImpl, RemoveFixedBlocksOneParameterBlockConstant) {
   ProblemImpl problem;
   double x;
   double y;
   double z;

   problem.AddParameterBlock(&x, 1);
   problem.AddParameterBlock(&y, 1);
   problem.AddParameterBlock(&z, 1);
   problem.AddResidualBlock(new UnaryCostFunction(), NULL, &x);
   problem.AddResidualBlock(new BinaryCostFunction(), NULL, &x, &y);
   problem.SetParameterBlockConstant(&x);

   int num_eliminate_blocks = 0;
   Program program(problem.program());
   string error;
   EXPECT_TRUE(SolverImpl::RemoveFixedBlocksFromProgram(&program,
                                                        &num_eliminate_blocks,
                                                        &error));
   EXPECT_EQ(program.NumParameterBlocks(), 1);
   EXPECT_EQ(program.NumResidualBlocks(), 1);
   EXPECT_EQ(num_eliminate_blocks, 0);
 }

 TEST(SolverImpl, RemoveFixedBlocksNumEliminateBlocks) {
   ProblemImpl problem;
   double x;
   double y;
   double z;

   problem.AddParameterBlock(&x, 1);
   problem.AddParameterBlock(&y, 1);
   problem.AddParameterBlock(&z, 1);
   problem.AddResidualBlock(new UnaryCostFunction(), NULL, &x);
   problem.AddResidualBlock(new TernaryCostFunction(), NULL, &x, &y, &z);
   problem.AddResidualBlock(new BinaryCostFunction(), NULL, &x, &y);
   problem.SetParameterBlockConstant(&x);

   int num_eliminate_blocks = 2;
   Program program(problem.program());
   string error;
   EXPECT_TRUE(SolverImpl::RemoveFixedBlocksFromProgram(&program,
                                                        &num_eliminate_blocks,
                                                        &error));
   EXPECT_EQ(program.NumParameterBlocks(), 2);
   EXPECT_EQ(program.NumResidualBlocks(), 2);
   EXPECT_EQ(num_eliminate_blocks, 1);
 }

 TEST(SolverImpl, ReorderResidualBlockNonSchurSolver) {
   ProblemImpl problem;
   double x;
   double y;
   double z;

   problem.AddParameterBlock(&x, 1);
   problem.AddParameterBlock(&y, 1);
   problem.AddParameterBlock(&z, 1);
   problem.AddResidualBlock(new UnaryCostFunction(), NULL, &x);
   problem.AddResidualBlock(new TernaryCostFunction(), NULL, &x, &y, &z);
   problem.AddResidualBlock(new BinaryCostFunction(), NULL, &x, &y);

   const vector<ResidualBlock*>& residual_blocks =
       problem.program().residual_blocks();
   vector<ResidualBlock*> current_residual_blocks(residual_blocks);

   Solver::Options options;
   options.linear_solver_type = SPARSE_NORMAL_CHOLESKY;
   string error;

   EXPECT_TRUE(SolverImpl::MaybeReorderResidualBlocks(options,
                                                      problem.mutable_program(),
                                                      &error));
   for (int i = 0; i < current_residual_blocks.size(); ++i) {
     EXPECT_EQ(current_residual_blocks[i], residual_blocks[i]);
   }
 }

 TEST(SolverImpl, ReorderResidualBlockNumEliminateBlockDeathTest) {
   ProblemImpl problem;
   double x;
   double y;
   double z;

   problem.AddParameterBlock(&x, 1);
   problem.AddParameterBlock(&y, 1);
   problem.AddParameterBlock(&z, 1);
   problem.AddResidualBlock(new UnaryCostFunction(), NULL, &x);
   problem.AddResidualBlock(new TernaryCostFunction(), NULL, &x, &y, &z);
   problem.AddResidualBlock(new BinaryCostFunction(), NULL, &x, &y);

   Solver::Options options;
   options.linear_solver_type = DENSE_SCHUR;
   options.num_eliminate_blocks = 0;
   string error;
   EXPECT_DEATH(
       SolverImpl::MaybeReorderResidualBlocks(
           options, problem.mutable_program(), &error),
       "Congratulations");
 }

 TEST(SolverImpl, ReorderResidualBlockNormalFunction) {
   ProblemImpl problem;
   double x;
   double y;
   double z;

   problem.AddParameterBlock(&x, 1);
   problem.AddParameterBlock(&y, 1);
   problem.AddParameterBlock(&z, 1);

   problem.AddResidualBlock(new UnaryCostFunction(), NULL, &x);
   problem.AddResidualBlock(new BinaryCostFunction(), NULL, &z, &x);
   problem.AddResidualBlock(new BinaryCostFunction(), NULL, &z, &y);
   problem.AddResidualBlock(new UnaryCostFunction(), NULL, &z);
   problem.AddResidualBlock(new BinaryCostFunction(), NULL, &x, &y);
   problem.AddResidualBlock(new UnaryCostFunction(), NULL, &y);

   Solver::Options options;
   options.linear_solver_type = DENSE_SCHUR;
   options.num_eliminate_blocks = 2;

   const vector<ResidualBlock*>& residual_blocks =
       problem.program().residual_blocks();

   vector<ResidualBlock*> expected_residual_blocks;

   // This is a bit fragile, but it serves the purpose. We know the
   // bucketing algorithm that the reordering function uses, so we
   // expect the order for residual blocks for each e_block to be
   // filled in reverse.
   expected_residual_blocks.push_back(residual_blocks[4]);
   expected_residual_blocks.push_back(residual_blocks[1]);
   expected_residual_blocks.push_back(residual_blocks[0]);
   expected_residual_blocks.push_back(residual_blocks[5]);
   expected_residual_blocks.push_back(residual_blocks[2]);
   expected_residual_blocks.push_back(residual_blocks[3]);

   Program* program = problem.mutable_program();
   program->SetParameterOffsetsAndIndex();

   string error;
   EXPECT_TRUE(SolverImpl::MaybeReorderResidualBlocks(options,
                                                      problem.mutable_program(),
                                                      &error));
   for (int i = 0; i < expected_residual_blocks.size(); ++i) {
     EXPECT_EQ(residual_blocks[i], expected_residual_blocks[i]);
   }
 }

 TEST(SolverImpl, ApplyUserOrderingOrderingTooSmall) {
   ProblemImpl problem;
   double x;
   double y;
   double z;

   problem.AddParameterBlock(&x, 1);
   problem.AddParameterBlock(&y, 1);
   problem.AddParameterBlock(&z, 1);

   vector<double*> ordering;
   ordering.push_back(&x);
   ordering.push_back(&z);

   Program program(problem.program());
   string error;
   EXPECT_FALSE(SolverImpl::ApplyUserOrdering(problem,
                                              ordering,
                                              &program,
                                              &error));
 }

 TEST(SolverImpl, ApplyUserOrderingHasDuplicates) {
   ProblemImpl problem;
   double x;
   double y;
   double z;

   problem.AddParameterBlock(&x, 1);
   problem.AddParameterBlock(&y, 1);
   problem.AddParameterBlock(&z, 1);

   vector<double*> ordering;
   ordering.push_back(&x);
   ordering.push_back(&z);
   ordering.push_back(&z);

   Program program(problem.program());
   string error;
   EXPECT_FALSE(SolverImpl::ApplyUserOrdering(problem,
                                              ordering,
                                              &program,
                                              &error));
 }


 TEST(SolverImpl, ApplyUserOrderingNormal) {
   ProblemImpl problem;
   double x;
   double y;
   double z;

   problem.AddParameterBlock(&x, 1);
   problem.AddParameterBlock(&y, 1);
   problem.AddParameterBlock(&z, 1);

   vector<double*> ordering;
   ordering.push_back(&x);
   ordering.push_back(&z);
   ordering.push_back(&y);

   Program* program = problem.mutable_program();
   string error;

   EXPECT_TRUE(SolverImpl::ApplyUserOrdering(problem,
                                             ordering,
                                             program,
                                             &error));
   const vector<ParameterBlock*>& parameter_blocks = program->parameter_blocks();

   EXPECT_EQ(parameter_blocks.size(), 3);
   EXPECT_EQ(parameter_blocks[0]->user_state(), &x);
   EXPECT_EQ(parameter_blocks[1]->user_state(), &z);
   EXPECT_EQ(parameter_blocks[2]->user_state(), &y);
 }

 #ifdef CERES_NO_SUITESPARSE
 TEST(SolverImpl, CreateLinearSolverNoSuiteSparse) {
   Solver::Options options;
   options.linear_solver_type = SPARSE_NORMAL_CHOLESKY;
   string error;
   EXPECT_FALSE(SolverImpl::CreateLinearSolver(&options, &error));
 }
 #endif  // CERES_NO_SUITESPARSE

 TEST(SolverImpl, CreateLinearSolverNegativeMaxNumIterations) {
   Solver::Options options;
   options.linear_solver_type = DENSE_QR;
   options.linear_solver_max_num_iterations = -1;
   string error;
   EXPECT_EQ(SolverImpl::CreateLinearSolver(&options, &error),
             static_cast<LinearSolver*>(NULL));
 }

 TEST(SolverImpl, CreateLinearSolverNegativeMinNumIterations) {
   Solver::Options options;
   options.linear_solver_type = DENSE_QR;
   options.linear_solver_min_num_iterations = -1;
   string error;
   EXPECT_EQ(SolverImpl::CreateLinearSolver(&options, &error),
             static_cast<LinearSolver*>(NULL));
 }

 TEST(SolverImpl, CreateLinearSolverMaxLessThanMinIterations) {
   Solver::Options options;
   options.linear_solver_type = DENSE_QR;
   options.linear_solver_min_num_iterations = 10;
   options.linear_solver_max_num_iterations = 5;
   string error;
   EXPECT_EQ(SolverImpl::CreateLinearSolver(&options, &error),
             static_cast<LinearSolver*>(NULL));
 }

 TEST(SolverImpl, CreateLinearSolverZeroNumEliminateBlocks) {
   Solver::Options options;
   options.num_eliminate_blocks = 0;
   options.linear_solver_type = DENSE_SCHUR;
   string error;
   scoped_ptr<LinearSolver> solver(
       SolverImpl::CreateLinearSolver(&options, &error));
   EXPECT_TRUE(solver != NULL);
 #ifndef CERES_NO_SUITESPARSE
   EXPECT_EQ(options.linear_solver_type, SPARSE_NORMAL_CHOLESKY);
 #else
   EXPECT_EQ(options.linear_solver_type, DENSE_QR);
 #endif  // CERES_NO_SUITESPARSE
 }

 TEST(SolverImpl, CreateLinearSolverDenseSchurMultipleThreads) {
   Solver::Options options;
   options.num_eliminate_blocks = 1;
   options.linear_solver_type = DENSE_SCHUR;
   options.num_linear_solver_threads = 2;
   string error;
   scoped_ptr<LinearSolver> solver(
       SolverImpl::CreateLinearSolver(&options, &error));
   EXPECT_TRUE(solver != NULL);
   EXPECT_EQ(options.linear_solver_type, DENSE_SCHUR);
   EXPECT_EQ(options.num_linear_solver_threads, 1);
 }

 TEST(SolverImpl, CreateLinearSolverNormalOperation) {
   Solver::Options options;
   scoped_ptr<LinearSolver> solver;
   options.linear_solver_type = DENSE_QR;
   string error;
   solver.reset(SolverImpl::CreateLinearSolver(&options, &error));
   EXPECT_EQ(options.linear_solver_type, DENSE_QR);
   EXPECT_TRUE(solver.get() != NULL);

 #ifndef CERES_NO_SUITESPARSE
   options.linear_solver_type = SPARSE_NORMAL_CHOLESKY;
   solver.reset(SolverImpl::CreateLinearSolver(&options, &error));
   EXPECT_EQ(options.linear_solver_type, SPARSE_NORMAL_CHOLESKY);
   EXPECT_TRUE(solver.get() != NULL);
 #endif  // CERES_NO_SUITESPARSE

   options.linear_solver_type = DENSE_SCHUR;
   options.num_eliminate_blocks = 2;
   solver.reset(SolverImpl::CreateLinearSolver(&options, &error));
   EXPECT_EQ(options.linear_solver_type, DENSE_SCHUR);
   EXPECT_TRUE(solver.get() != NULL);

   options.linear_solver_type = SPARSE_SCHUR;
   options.num_eliminate_blocks = 2;
 #ifndef CERES_NO_SUITESPARSE
   solver.reset(SolverImpl::CreateLinearSolver(&options, &error));
   EXPECT_TRUE(solver.get() != NULL);
   EXPECT_EQ(options.linear_solver_type, SPARSE_SCHUR);
 #else   // CERES_NO_SUITESPARSE
   EXPECT_TRUE(SolverImpl::CreateLinearSolver(&options, &error) == NULL);
 #endif  // CERES_NO_SUITESPARSE

   options.linear_solver_type = ITERATIVE_SCHUR;
   options.num_eliminate_blocks = 2;
   solver.reset(SolverImpl::CreateLinearSolver(&options, &error));
   EXPECT_EQ(options.linear_solver_type, ITERATIVE_SCHUR);
   EXPECT_TRUE(solver.get() != NULL);
 }

 }  // namespace internal
 }  // namespace ceres
	// Ceres Solver - A fast non-linear least squares minimizer
	// Copyright 2010, 2011, 2012 Google Inc. All rights reserved.
	// http://code.google.com/p/ceres-solver/
	//
	// 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 Google Inc. 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 OWNER 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.
	//
	// Author: sameeragarwal@google.com (Sameer Agarwal)

	#include "gtest/gtest.h"
	#include "ceres/linear_solver.h"
	#include "ceres/parameter_block.h"
	#include "ceres/problem_impl.h"
	#include "ceres/program.h"
	#include "ceres/residual_block.h"
	#include "ceres/solver_impl.h"
	#include "ceres/sized_cost_function.h"

	namespace ceres {
	namespace internal {

	// Templated base class for the CostFunction signatures.
	template <int kNumResiduals, int N0, int N1, int N2>
	class MockCostFunctionBase : public
	SizedCostFunction<kNumResiduals, N0, N1, N2> {
	public:
	virtual bool Evaluate(double const* const* parameters,
	double* residuals,
	double** jacobians) const {
	// Do nothing. This is never called.
	return true;
	}
	};

	class UnaryCostFunction : public MockCostFunctionBase<2, 1, 0, 0> {};
	class BinaryCostFunction : public MockCostFunctionBase<2, 1, 1, 0> {};
	class TernaryCostFunction : public MockCostFunctionBase<2, 1, 1, 1> {};

	TEST(SolverImpl, RemoveFixedBlocksNothingConstant) {
	ProblemImpl problem;
	double x;
	double y;
	double z;

	problem.AddParameterBlock(&x, 1);
	problem.AddParameterBlock(&y, 1);
	problem.AddParameterBlock(&z, 1);
	problem.AddResidualBlock(new UnaryCostFunction(), NULL, &x);
	problem.AddResidualBlock(new BinaryCostFunction(), NULL, &x, &y);
	problem.AddResidualBlock(new TernaryCostFunction(), NULL, &x, &y, &z);

	string error;
	{
	int num_eliminate_blocks = 0;
	Program program(*problem.mutable_program());
	EXPECT_TRUE(SolverImpl::RemoveFixedBlocksFromProgram(&program,
	&num_eliminate_blocks,
	&error));
	EXPECT_EQ(program.NumParameterBlocks(), 3);
	EXPECT_EQ(program.NumResidualBlocks(), 3);
	EXPECT_EQ(num_eliminate_blocks, 0);
	}

	// Check that num_eliminate_blocks is preserved, when it contains
	// all blocks.
	{
	int num_eliminate_blocks = 3;
	Program program(problem.program());
	EXPECT_TRUE(SolverImpl::RemoveFixedBlocksFromProgram(&program,
	&num_eliminate_blocks,
	&error));
	EXPECT_EQ(program.NumParameterBlocks(), 3);
	EXPECT_EQ(program.NumResidualBlocks(), 3);
	EXPECT_EQ(num_eliminate_blocks, 3);
	}
	}

	TEST(SolverImpl, RemoveFixedBlocksAllParameterBlocksConstant) {
	ProblemImpl problem;
	double x;

	problem.AddParameterBlock(&x, 1);
	problem.AddResidualBlock(new UnaryCostFunction(), NULL, &x);
	problem.SetParameterBlockConstant(&x);

	int num_eliminate_blocks = 0;
	Program program(problem.program());
	string error;
	EXPECT_TRUE(SolverImpl::RemoveFixedBlocksFromProgram(&program,
	&num_eliminate_blocks,
	&error));
	EXPECT_EQ(program.NumParameterBlocks(), 0);
	EXPECT_EQ(program.NumResidualBlocks(), 0);
	EXPECT_EQ(num_eliminate_blocks, 0);
	}

	TEST(SolverImpl, RemoveFixedBlocksNoResidualBlocks) {
	ProblemImpl problem;
	double x;
	double y;
	double z;

	problem.AddParameterBlock(&x, 1);
	problem.AddParameterBlock(&y, 1);
	problem.AddParameterBlock(&z, 1);

	int num_eliminate_blocks = 0;
	Program program(problem.program());
	string error;
	EXPECT_TRUE(SolverImpl::RemoveFixedBlocksFromProgram(&program,
	&num_eliminate_blocks,
	&error));
	EXPECT_EQ(program.NumParameterBlocks(), 0);
	EXPECT_EQ(program.NumResidualBlocks(), 0);
	EXPECT_EQ(num_eliminate_blocks, 0);
	}

	TEST(SolverImpl, RemoveFixedBlocksOneParameterBlockConstant) {
	ProblemImpl problem;
	double x;
	double y;
	double z;

	problem.AddParameterBlock(&x, 1);
	problem.AddParameterBlock(&y, 1);
	problem.AddParameterBlock(&z, 1);
	problem.AddResidualBlock(new UnaryCostFunction(), NULL, &x);
	problem.AddResidualBlock(new BinaryCostFunction(), NULL, &x, &y);
	problem.SetParameterBlockConstant(&x);

	int num_eliminate_blocks = 0;
	Program program(problem.program());
	string error;
	EXPECT_TRUE(SolverImpl::RemoveFixedBlocksFromProgram(&program,
	&num_eliminate_blocks,
	&error));
	EXPECT_EQ(program.NumParameterBlocks(), 1);
	EXPECT_EQ(program.NumResidualBlocks(), 1);
	EXPECT_EQ(num_eliminate_blocks, 0);
	}

	TEST(SolverImpl, RemoveFixedBlocksNumEliminateBlocks) {
	ProblemImpl problem;
	double x;
	double y;
	double z;

	problem.AddParameterBlock(&x, 1);
	problem.AddParameterBlock(&y, 1);
	problem.AddParameterBlock(&z, 1);
	problem.AddResidualBlock(new UnaryCostFunction(), NULL, &x);
	problem.AddResidualBlock(new TernaryCostFunction(), NULL, &x, &y, &z);
	problem.AddResidualBlock(new BinaryCostFunction(), NULL, &x, &y);
	problem.SetParameterBlockConstant(&x);

	int num_eliminate_blocks = 2;
	Program program(problem.program());
	string error;
	EXPECT_TRUE(SolverImpl::RemoveFixedBlocksFromProgram(&program,
	&num_eliminate_blocks,
	&error));
	EXPECT_EQ(program.NumParameterBlocks(), 2);
	EXPECT_EQ(program.NumResidualBlocks(), 2);
	EXPECT_EQ(num_eliminate_blocks, 1);
	}

	TEST(SolverImpl, ReorderResidualBlockNonSchurSolver) {
	ProblemImpl problem;
	double x;
	double y;
	double z;

	problem.AddParameterBlock(&x, 1);
	problem.AddParameterBlock(&y, 1);
	problem.AddParameterBlock(&z, 1);
	problem.AddResidualBlock(new UnaryCostFunction(), NULL, &x);
	problem.AddResidualBlock(new TernaryCostFunction(), NULL, &x, &y, &z);
	problem.AddResidualBlock(new BinaryCostFunction(), NULL, &x, &y);

	const vector<ResidualBlock*>& residual_blocks =
	problem.program().residual_blocks();
	vector<ResidualBlock*> current_residual_blocks(residual_blocks);

	Solver::Options options;
	options.linear_solver_type = SPARSE_NORMAL_CHOLESKY;
	string error;

	EXPECT_TRUE(SolverImpl::MaybeReorderResidualBlocks(options,
	problem.mutable_program(),
	&error));
	for (int i = 0; i < current_residual_blocks.size(); ++i) {
	EXPECT_EQ(current_residual_blocks[i], residual_blocks[i]);
	}
	}

	TEST(SolverImpl, ReorderResidualBlockNumEliminateBlockDeathTest) {
	ProblemImpl problem;
	double x;
	double y;
	double z;

	problem.AddParameterBlock(&x, 1);
	problem.AddParameterBlock(&y, 1);
	problem.AddParameterBlock(&z, 1);
	problem.AddResidualBlock(new UnaryCostFunction(), NULL, &x);
	problem.AddResidualBlock(new TernaryCostFunction(), NULL, &x, &y, &z);
	problem.AddResidualBlock(new BinaryCostFunction(), NULL, &x, &y);

	Solver::Options options;
	options.linear_solver_type = DENSE_SCHUR;
	options.num_eliminate_blocks = 0;
	string error;
	EXPECT_DEATH(
	SolverImpl::MaybeReorderResidualBlocks(
	options, problem.mutable_program(), &error),
	"Congratulations");
	}

	TEST(SolverImpl, ReorderResidualBlockNormalFunction) {
	ProblemImpl problem;
	double x;
	double y;
	double z;

	problem.AddParameterBlock(&x, 1);
	problem.AddParameterBlock(&y, 1);
	problem.AddParameterBlock(&z, 1);

	problem.AddResidualBlock(new UnaryCostFunction(), NULL, &x);
	problem.AddResidualBlock(new BinaryCostFunction(), NULL, &z, &x);
	problem.AddResidualBlock(new BinaryCostFunction(), NULL, &z, &y);
	problem.AddResidualBlock(new UnaryCostFunction(), NULL, &z);
	problem.AddResidualBlock(new BinaryCostFunction(), NULL, &x, &y);
	problem.AddResidualBlock(new UnaryCostFunction(), NULL, &y);

	Solver::Options options;
	options.linear_solver_type = DENSE_SCHUR;
	options.num_eliminate_blocks = 2;

	const vector<ResidualBlock*>& residual_blocks =
	problem.program().residual_blocks();

	vector<ResidualBlock*> expected_residual_blocks;

	// This is a bit fragile, but it serves the purpose. We know the
	// bucketing algorithm that the reordering function uses, so we
	// expect the order for residual blocks for each e_block to be
	// filled in reverse.
	expected_residual_blocks.push_back(residual_blocks[4]);
	expected_residual_blocks.push_back(residual_blocks[1]);
	expected_residual_blocks.push_back(residual_blocks[0]);
	expected_residual_blocks.push_back(residual_blocks[5]);
	expected_residual_blocks.push_back(residual_blocks[2]);
	expected_residual_blocks.push_back(residual_blocks[3]);

	Program* program = problem.mutable_program();
	program->SetParameterOffsetsAndIndex();

	string error;
	EXPECT_TRUE(SolverImpl::MaybeReorderResidualBlocks(options,
	problem.mutable_program(),
	&error));
	for (int i = 0; i < expected_residual_blocks.size(); ++i) {
	EXPECT_EQ(residual_blocks[i], expected_residual_blocks[i]);
	}
	}

	TEST(SolverImpl, ApplyUserOrderingOrderingTooSmall) {
	ProblemImpl problem;
	double x;
	double y;
	double z;

	problem.AddParameterBlock(&x, 1);
	problem.AddParameterBlock(&y, 1);
	problem.AddParameterBlock(&z, 1);

	vector<double*> ordering;
	ordering.push_back(&x);
	ordering.push_back(&z);

	Program program(problem.program());
	string error;
	EXPECT_FALSE(SolverImpl::ApplyUserOrdering(problem,
	ordering,
	&program,
	&error));
	}

	TEST(SolverImpl, ApplyUserOrderingHasDuplicates) {
	ProblemImpl problem;
	double x;
	double y;
	double z;

	problem.AddParameterBlock(&x, 1);
	problem.AddParameterBlock(&y, 1);
	problem.AddParameterBlock(&z, 1);

	vector<double*> ordering;
	ordering.push_back(&x);
	ordering.push_back(&z);
	ordering.push_back(&z);

	Program program(problem.program());
	string error;
	EXPECT_FALSE(SolverImpl::ApplyUserOrdering(problem,
	ordering,
	&program,
	&error));
	}


	TEST(SolverImpl, ApplyUserOrderingNormal) {
	ProblemImpl problem;
	double x;
	double y;
	double z;

	problem.AddParameterBlock(&x, 1);
	problem.AddParameterBlock(&y, 1);
	problem.AddParameterBlock(&z, 1);

	vector<double*> ordering;
	ordering.push_back(&x);
	ordering.push_back(&z);
	ordering.push_back(&y);

	Program* program = problem.mutable_program();
	string error;

	EXPECT_TRUE(SolverImpl::ApplyUserOrdering(problem,
	ordering,
	program,
	&error));
	const vector<ParameterBlock*>& parameter_blocks = program->parameter_blocks();

	EXPECT_EQ(parameter_blocks.size(), 3);
	EXPECT_EQ(parameter_blocks[0]->user_state(), &x);
	EXPECT_EQ(parameter_blocks[1]->user_state(), &z);
	EXPECT_EQ(parameter_blocks[2]->user_state(), &y);
	}

	#ifdef CERES_NO_SUITESPARSE
	TEST(SolverImpl, CreateLinearSolverNoSuiteSparse) {
	Solver::Options options;
	options.linear_solver_type = SPARSE_NORMAL_CHOLESKY;
	string error;
	EXPECT_FALSE(SolverImpl::CreateLinearSolver(&options, &error));
	}
	#endif // CERES_NO_SUITESPARSE

	TEST(SolverImpl, CreateLinearSolverNegativeMaxNumIterations) {
	Solver::Options options;
	options.linear_solver_type = DENSE_QR;
	options.linear_solver_max_num_iterations = -1;
	string error;
	EXPECT_EQ(SolverImpl::CreateLinearSolver(&options, &error),
	static_cast<LinearSolver*>(NULL));
	}

	TEST(SolverImpl, CreateLinearSolverNegativeMinNumIterations) {
	Solver::Options options;
	options.linear_solver_type = DENSE_QR;
	options.linear_solver_min_num_iterations = -1;
	string error;
	EXPECT_EQ(SolverImpl::CreateLinearSolver(&options, &error),
	static_cast<LinearSolver*>(NULL));
	}

	TEST(SolverImpl, CreateLinearSolverMaxLessThanMinIterations) {
	Solver::Options options;
	options.linear_solver_type = DENSE_QR;
	options.linear_solver_min_num_iterations = 10;
	options.linear_solver_max_num_iterations = 5;
	string error;
	EXPECT_EQ(SolverImpl::CreateLinearSolver(&options, &error),
	static_cast<LinearSolver*>(NULL));
	}

	TEST(SolverImpl, CreateLinearSolverZeroNumEliminateBlocks) {
	Solver::Options options;
	options.num_eliminate_blocks = 0;
	options.linear_solver_type = DENSE_SCHUR;
	string error;
	scoped_ptr<LinearSolver> solver(
	SolverImpl::CreateLinearSolver(&options, &error));
	EXPECT_TRUE(solver != NULL);
	#ifndef CERES_NO_SUITESPARSE
	EXPECT_EQ(options.linear_solver_type, SPARSE_NORMAL_CHOLESKY);
	#else
	EXPECT_EQ(options.linear_solver_type, DENSE_QR);
	#endif // CERES_NO_SUITESPARSE
	}

	TEST(SolverImpl, CreateLinearSolverDenseSchurMultipleThreads) {
	Solver::Options options;
	options.num_eliminate_blocks = 1;
	options.linear_solver_type = DENSE_SCHUR;
	options.num_linear_solver_threads = 2;
	string error;
	scoped_ptr<LinearSolver> solver(
	SolverImpl::CreateLinearSolver(&options, &error));
	EXPECT_TRUE(solver != NULL);
	EXPECT_EQ(options.linear_solver_type, DENSE_SCHUR);
	EXPECT_EQ(options.num_linear_solver_threads, 1);
	}

	TEST(SolverImpl, CreateLinearSolverNormalOperation) {
	Solver::Options options;
	scoped_ptr<LinearSolver> solver;
	options.linear_solver_type = DENSE_QR;
	string error;
	solver.reset(SolverImpl::CreateLinearSolver(&options, &error));
	EXPECT_EQ(options.linear_solver_type, DENSE_QR);
	EXPECT_TRUE(solver.get() != NULL);

	#ifndef CERES_NO_SUITESPARSE
	options.linear_solver_type = SPARSE_NORMAL_CHOLESKY;
	solver.reset(SolverImpl::CreateLinearSolver(&options, &error));
	EXPECT_EQ(options.linear_solver_type, SPARSE_NORMAL_CHOLESKY);
	EXPECT_TRUE(solver.get() != NULL);
	#endif // CERES_NO_SUITESPARSE

	options.linear_solver_type = DENSE_SCHUR;
	options.num_eliminate_blocks = 2;
	solver.reset(SolverImpl::CreateLinearSolver(&options, &error));
	EXPECT_EQ(options.linear_solver_type, DENSE_SCHUR);
	EXPECT_TRUE(solver.get() != NULL);

	options.linear_solver_type = SPARSE_SCHUR;
	options.num_eliminate_blocks = 2;
	#ifndef CERES_NO_SUITESPARSE
	solver.reset(SolverImpl::CreateLinearSolver(&options, &error));
	EXPECT_TRUE(solver.get() != NULL);
	EXPECT_EQ(options.linear_solver_type, SPARSE_SCHUR);
	#else // CERES_NO_SUITESPARSE
	EXPECT_TRUE(SolverImpl::CreateLinearSolver(&options, &error) == NULL);
	#endif // CERES_NO_SUITESPARSE

	options.linear_solver_type = ITERATIVE_SCHUR;
	options.num_eliminate_blocks = 2;
	solver.reset(SolverImpl::CreateLinearSolver(&options, &error));
	EXPECT_EQ(options.linear_solver_type, ITERATIVE_SCHUR);
	EXPECT_TRUE(solver.get() != NULL);
	}

	} // namespace internal
	} // namespace ceres