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// 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_
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