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// Ceres Solver - A fast non-linear least squares minimizer
// Copyright 2023 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
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// Author: sameeragarwal@google.com (Sameer Agarwal)
#ifndef CERES_INTERNAL_LINE_SEARCH_DIRECTION_H_
#define CERES_INTERNAL_LINE_SEARCH_DIRECTION_H_
#include <memory>
#include "ceres/internal/eigen.h"
#include "ceres/internal/export.h"
#include "ceres/line_search_minimizer.h"
#include "ceres/types.h"
namespace ceres::internal {
class CERES_NO_EXPORT LineSearchDirection {
public:
struct Options {
int num_parameters{0};
LineSearchDirectionType type{LBFGS};
NonlinearConjugateGradientType nonlinear_conjugate_gradient_type{
FLETCHER_REEVES};
double function_tolerance{1e-12};
int max_lbfgs_rank{20};
bool use_approximate_eigenvalue_bfgs_scaling{true};
};
static std::unique_ptr<LineSearchDirection> Create(const Options& options);
virtual ~LineSearchDirection();
virtual bool NextDirection(const LineSearchMinimizer::State& previous,
const LineSearchMinimizer::State& current,
Vector* search_direction) = 0;
};
} // namespace ceres::internal
#endif // CERES_INTERNAL_LINE_SEARCH_DIRECTION_H_