SHOGUN  3.2.1
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MeanSquaredLogError.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) 2012 Heiko Strathmann
8  * Copyright (C) 2012 Berlin Institute of Technology and Max-Planck-Society
9  */
10 
12 #include <shogun/labels/Labels.h>
15 
16 using namespace shogun;
17 
19 {
20  ASSERT(predicted && ground_truth)
21  ASSERT(predicted->get_num_labels()==ground_truth->get_num_labels())
22  ASSERT(predicted->get_label_type()==LT_REGRESSION)
23  ASSERT(ground_truth->get_label_type()==LT_REGRESSION)
24 
25  int32_t length=predicted->get_num_labels();
26  float64_t msle=0.0;
27  for (int32_t i=0; i<length; i++)
28  {
29  float64_t prediction=((CRegressionLabels*) predicted)->get_label(i);
30  float64_t truth=((CRegressionLabels*) ground_truth)->get_label(i);
31 
32  if (prediction<=-1.0 || truth<=-1.0)
33  {
34  SG_WARNING("Negative label[%d] in %s is not allowed, ignoring!\n",
35  i, get_name());
36  continue;
37  }
38 
39  float64_t a=CMath::log(prediction+1);
40  float64_t b=CMath::log(truth+1);
41  msle+=CMath::sq(a-b);
42  }
43  msle /= length;
44  return CMath::sqrt(msle);
45 }

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