Alexandria  2.27.0
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 
22 namespace Euclid {
23 namespace SOM {
24 namespace 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 
32 Signature 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)