Alexandria 2.31.0
SDC-CH common library for the Euclid project
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LearningRestraintFunc.cpp
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1/*
2 * Copyright (C) 2012-2021 Euclid Science Ground Segment
3 *
4 * This library is free software; you can redistribute it and/or modify it under
5 * the terms of the GNU Lesser General Public License as published by the Free
6 * Software Foundation; either version 3.0 of the License, or (at your option)
7 * any later version.
8 *
9 * This library is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
11 * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
12 * details.
13 *
14 * You should have received a copy of the GNU Lesser General Public License
15 * along with this library; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
20#include <cmath>
21
22namespace Euclid {
23namespace SOM {
24namespace LearningRestraintFunc {
25
27 return [](std::size_t iteration, std::size_t total_iterations) -> double {
28 return 1.0 * (total_iterations - iteration) / total_iterations;
29 };
30}
31
32Signature exponentialDecay(double initial_rate) {
33 return [initial_rate](std::size_t iteration, std::size_t total_iterations) -> double {
34 return initial_rate * std::exp(-1. * iteration / total_iterations);
35 };
36}
37
38} // namespace LearningRestraintFunc
39} // namespace SOM
40} // namespace Euclid
T exp(T... args)
ELEMENTS_API Signature exponentialDecay(double initial_rate)