73 lines
2.8 KiB
C
73 lines
2.8 KiB
C
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// Ceres Solver - A fast non-linear least squares minimizer
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// Copyright 2015 Google Inc. All rights reserved.
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// http://ceres-solver.org/
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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//
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// * Redistributions of source code must retain the above copyright notice,
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// this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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// * Neither the name of Google Inc. nor the names of its contributors may be
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// used to endorse or promote products derived from this software without
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// specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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// POSSIBILITY OF SUCH DAMAGE.
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//
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// Author: sameeragarwal@google.com (Sameer Agarwal)
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#ifndef CERES_INTERNAL_LINE_SEARCH_DIRECTION_H_
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#define CERES_INTERNAL_LINE_SEARCH_DIRECTION_H_
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#include "ceres/internal/eigen.h"
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#include "ceres/line_search_minimizer.h"
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#include "ceres/types.h"
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namespace ceres {
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namespace internal {
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class LineSearchDirection {
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public:
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struct Options {
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Options()
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: num_parameters(0),
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type(LBFGS),
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nonlinear_conjugate_gradient_type(FLETCHER_REEVES),
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function_tolerance(1e-12),
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max_lbfgs_rank(20),
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use_approximate_eigenvalue_bfgs_scaling(true) {
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}
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int num_parameters;
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LineSearchDirectionType type;
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NonlinearConjugateGradientType nonlinear_conjugate_gradient_type;
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double function_tolerance;
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int max_lbfgs_rank;
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bool use_approximate_eigenvalue_bfgs_scaling;
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};
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static LineSearchDirection* Create(const Options& options);
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virtual ~LineSearchDirection() {}
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virtual bool NextDirection(const LineSearchMinimizer::State& previous,
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const LineSearchMinimizer::State& current,
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Vector* search_direction) = 0;
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};
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} // namespace internal
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} // namespace ceres
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#endif // CERES_INTERNAL_LINE_SEARCH_DIRECTION_H_
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