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 38namespace ceres { 39namespace internal { 40 41class LineSearchDirection { 42 public: 43 struct Options { 44 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 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