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LogLossMargin.cpp
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1 /*
2  * This program is free software; you can redistribute it and/or modify
3  * it under the terms of the GNU General Public License as published by
4  * the Free Software Foundation; either version 3 of the License, or
5  * (at your option) any later version.
6  *
7  * Written (W) 2011 Shashwat Lal Das
8  * Copyright (c) 2011 Berlin Institute of Technology and Max-Planck-Society.
9  */
10 
12 
13 using namespace shogun;
14 
16 {
17  float64_t z = prediction * label;
18  if (z >= 1)
19  return log(1+exp(1-z));
20  return 1-z + log(1+exp(z-1));
21 }
22 
24 {
25  float64_t z = prediction * label;
26  if (z < 1)
27  return -1 / (exp(z-1) + 1);
28  float64_t ez = exp(1-z);
29  return -ez / (ez + 1);
30 }
31 
33 {
34  float64_t z = prediction * label;
35  float64_t ez = exp(z-1);
36 
37  return ez / (ez + 1)*(ez + 1);
38 }
39 
41 {
43  return -1;
44 }
45 
47 {
49  return -1;
50 }

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