/usr/include/ceres/numeric_diff_options.h is in libceres-dev 1.11.0~dfsg0-2.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 | // Ceres Solver - A fast non-linear least squares minimizer
// Copyright 2015 Google Inc. All rights reserved.
// http://ceres-solver.org/
//
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// modification, are permitted provided that the following conditions are met:
//
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// Author: tbennun@gmail.com (Tal Ben-Nun)
//
#ifndef CERES_PUBLIC_NUMERIC_DIFF_OPTIONS_H_
#define CERES_PUBLIC_NUMERIC_DIFF_OPTIONS_H_
namespace ceres {
// Options pertaining to numeric differentiation (e.g., convergence criteria,
// step sizes).
struct CERES_EXPORT NumericDiffOptions {
NumericDiffOptions() {
relative_step_size = 1e-6;
ridders_relative_initial_step_size = 1e-2;
max_num_ridders_extrapolations = 10;
ridders_epsilon = 1e-12;
ridders_step_shrink_factor = 2.0;
}
// Numeric differentiation step size (multiplied by parameter block's
// order of magnitude). If parameters are close to zero, the step size
// is set to sqrt(machine_epsilon).
double relative_step_size;
// Initial step size for Ridders adaptive numeric differentiation (multiplied
// by parameter block's order of magnitude).
// If parameters are close to zero, Ridders' method sets the step size
// directly to this value. This parameter is separate from
// "relative_step_size" in order to set a different default value.
//
// Note: For Ridders' method to converge, the step size should be initialized
// to a value that is large enough to produce a significant change in the
// function. As the derivative is estimated, the step size decreases.
double ridders_relative_initial_step_size;
// Maximal number of adaptive extrapolations (sampling) in Ridders' method.
int max_num_ridders_extrapolations;
// Convergence criterion on extrapolation error for Ridders adaptive
// differentiation. The available error estimation methods are defined in
// NumericDiffErrorType and set in the "ridders_error_method" field.
double ridders_epsilon;
// The factor in which to shrink the step size with each extrapolation in
// Ridders' method.
double ridders_step_shrink_factor;
};
} // namespace ceres
#endif // CERES_PUBLIC_NUMERIC_DIFF_OPTIONS_H_
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