// Ceres Solver - A fast non-linear least squares minimizer // Copyright 2023 Google Inc. All rights reserved. // http://ceres-solver.org/ // // 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) #ifndef CERES_INTERNAL_LINE_SEARCH_DIRECTION_H_ #define CERES_INTERNAL_LINE_SEARCH_DIRECTION_H_ #include <memory> #include "ceres/internal/eigen.h" #include "ceres/internal/export.h" #include "ceres/line_search_minimizer.h" #include "ceres/types.h" namespace ceres::internal { class CERES_NO_EXPORT LineSearchDirection { public: struct Options { int num_parameters{0}; LineSearchDirectionType type{LBFGS}; NonlinearConjugateGradientType nonlinear_conjugate_gradient_type{ FLETCHER_REEVES}; double function_tolerance{1e-12}; int max_lbfgs_rank{20}; bool use_approximate_eigenvalue_bfgs_scaling{true}; }; static std::unique_ptr<LineSearchDirection> Create(const Options& options); virtual ~LineSearchDirection(); virtual bool NextDirection(const LineSearchMinimizer::State& previous, const LineSearchMinimizer::State& current, Vector* search_direction) = 0; }; } // namespace ceres::internal #endif // CERES_INTERNAL_LINE_SEARCH_DIRECTION_H_