| // Ceres Solver - A fast non-linear least squares minimizer |
| // Copyright 2015 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 "ceres/internal/eigen.h" |
| #include "ceres/line_search_minimizer.h" |
| #include "ceres/types.h" |
| |
| namespace ceres { |
| namespace internal { |
| |
| class LineSearchDirection { |
| public: |
| struct Options { |
| Options() |
| : num_parameters(0), |
| type(LBFGS), |
| nonlinear_conjugate_gradient_type(FLETCHER_REEVES), |
| function_tolerance(1e-12), |
| max_lbfgs_rank(20), |
| use_approximate_eigenvalue_bfgs_scaling(true) { |
| } |
| |
| int num_parameters; |
| LineSearchDirectionType type; |
| NonlinearConjugateGradientType nonlinear_conjugate_gradient_type; |
| double function_tolerance; |
| int max_lbfgs_rank; |
| bool use_approximate_eigenvalue_bfgs_scaling; |
| }; |
| |
| static LineSearchDirection* Create(const Options& options); |
| |
| virtual ~LineSearchDirection() {} |
| virtual bool NextDirection(const LineSearchMinimizer::State& previous, |
| const LineSearchMinimizer::State& current, |
| Vector* search_direction) = 0; |
| }; |
| |
| } // namespace internal |
| } // namespace ceres |
| |
| #endif // CERES_INTERNAL_LINE_SEARCH_DIRECTION_H_ |