1 // Ceres Solver - A fast non-linear least squares minimizer 2 // Copyright 2012 Google Inc. All rights reserved. 3 // http://code.google.com/p/ceres-solver/ 4 // 5 // Redistribution and use in source and binary forms, with or without 6 // modification, are permitted provided that the following conditions are met: 7 // 8 // * Redistributions of source code must retain the above copyright notice, 9 // this list of conditions and the following disclaimer. 10 // * Redistributions in binary form must reproduce the above copyright notice, 11 // this list of conditions and the following disclaimer in the documentation 12 // and/or other materials provided with the distribution. 13 // * Neither the name of Google Inc. nor the names of its contributors may be 14 // used to endorse or promote products derived from this software without 15 // specific prior written permission. 16 // 17 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 18 // AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 // ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 21 // LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 22 // CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 23 // SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 24 // INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 25 // CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 26 // ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 27 // POSSIBILITY OF SUCH DAMAGE. 28 // 29 // Author: sameeragarwal@google.com (Sameer Agarwal) 30 31 #ifndef CERES_INTERNAL_LINE_SEARCH_DIRECTION_H_ 32 #define CERES_INTERNAL_LINE_SEARCH_DIRECTION_H_ 33 34 #include "ceres/internal/eigen.h" 35 #include "ceres/line_search_minimizer.h" 36 #include "ceres/types.h" 37 38 namespace ceres { 39 namespace internal { 40 41 class LineSearchDirection { 42 public: 43 struct Options { OptionsOptions44 Options() 45 : num_parameters(0), 46 type(LBFGS), 47 nonlinear_conjugate_gradient_type(FLETCHER_REEVES), 48 function_tolerance(1e-12), 49 max_lbfgs_rank(20), 50 use_approximate_eigenvalue_bfgs_scaling(true) { 51 } 52 53 int num_parameters; 54 LineSearchDirectionType type; 55 NonlinearConjugateGradientType nonlinear_conjugate_gradient_type; 56 double function_tolerance; 57 int max_lbfgs_rank; 58 bool use_approximate_eigenvalue_bfgs_scaling; 59 }; 60 61 static LineSearchDirection* Create(const Options& options); 62 ~LineSearchDirection()63 virtual ~LineSearchDirection() {} 64 virtual bool NextDirection(const LineSearchMinimizer::State& previous, 65 const LineSearchMinimizer::State& current, 66 Vector* search_direction) = 0; 67 }; 68 69 } // namespace internal 70 } // namespace ceres 71 72 #endif // CERES_INTERNAL_LINE_SEARCH_DIRECTION_H_ 73