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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 #ifndef CERES_NO_LINE_SEARCH_MINIMIZER
35 
36 #include "ceres/internal/eigen.h"
37 #include "ceres/line_search_minimizer.h"
38 #include "ceres/types.h"
39 
40 namespace ceres {
41 namespace internal {
42 
43 class LineSearchDirection {
44  public:
45   struct Options {
OptionsOptions46     Options()
47         : num_parameters(0),
48           type(LBFGS),
49           nonlinear_conjugate_gradient_type(FLETCHER_REEVES),
50           function_tolerance(1e-12),
51           max_lbfgs_rank(20),
52           use_approximate_eigenvalue_bfgs_scaling(true) {
53     }
54 
55     int num_parameters;
56     LineSearchDirectionType type;
57     NonlinearConjugateGradientType nonlinear_conjugate_gradient_type;
58     double function_tolerance;
59     int max_lbfgs_rank;
60     bool use_approximate_eigenvalue_bfgs_scaling;
61   };
62 
63   static LineSearchDirection* Create(const Options& options);
64 
~LineSearchDirection()65   virtual ~LineSearchDirection() {}
66   virtual bool NextDirection(const LineSearchMinimizer::State& previous,
67                              const LineSearchMinimizer::State& current,
68                              Vector* search_direction) = 0;
69 };
70 
71 }  // namespace internal
72 }  // namespace ceres
73 
74 #endif  // CERES_NO_LINE_SEARCH_MINIMIZER
75 #endif  // CERES_INTERNAL_LINE_SEARCH_DIRECTION_H_
76