Alexandria  2.19
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LearningRestraintFunc.h
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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 
19 /*
20  * @file LearningRestraintFunc.h
21  * @author nikoapos
22  */
23 
24 #ifndef SOM_LEARNINGRESTRAINTFUNC_H
25 #define SOM_LEARNINGRESTRAINTFUNC_H
26 
27 #include <cmath>
28 #include <functional>
29 
30 namespace Euclid {
31 namespace SOM {
32 namespace LearningRestraintFunc {
33 
35 
37  return [](std::size_t iteration, std::size_t total_iterations) -> double {
38  return 1.0 * (total_iterations - iteration) / total_iterations;
39  };
40 }
41 
42 Signature exponentialDecay(double initial_rate) {
43  return [initial_rate](std::size_t iteration, std::size_t total_iterations) -> double {
44  return initial_rate * std::exp(-1. * iteration / total_iterations);
45  };
46 }
47 
48 } // namespace LearningRestraintFunc
49 } // namespace SOM
50 } // namespace Euclid
51 
52 #endif /* SOM_LEARNINGRESTRAINTFUNC_H */
T exp(T...args)
Signature exponentialDecay(double initial_rate)