MeanSquaredLogError.cpp

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00001 /*
00002  * This program is free software; you can redistribute it and/or modify
00003  * it under the terms of the GNU General Public License as published by
00004  * the Free Software Foundation; either version 3 of the License, or
00005  * (at your option) any later version.
00006  *
00007  * Written (W) 2012 Heiko Strathmann
00008  * Copyright (C) 2012 Berlin Institute of Technology and Max-Planck-Society
00009  */
00010 
00011 #include <shogun/evaluation/MeanSquaredLogError.h>
00012 #include <shogun/labels/Labels.h>
00013 #include <shogun/labels/RegressionLabels.h>
00014 #include <shogun/mathematics/Math.h>
00015 
00016 using namespace shogun;
00017 
00018 float64_t CMeanSquaredLogError::evaluate(CLabels* predicted, CLabels* ground_truth)
00019 {
00020     ASSERT(predicted && ground_truth);
00021     ASSERT(predicted->get_num_labels()==ground_truth->get_num_labels());
00022     ASSERT(predicted->get_label_type()==LT_REGRESSION);
00023     ASSERT(ground_truth->get_label_type()==LT_REGRESSION);
00024 
00025     int32_t length=predicted->get_num_labels();
00026     float64_t msle=0.0;
00027     for (int32_t i=0; i<length; i++)
00028     {
00029         float64_t prediction=((CRegressionLabels*) predicted)->get_label(i);
00030         float64_t truth=((CRegressionLabels*) ground_truth)->get_label(i);
00031 
00032         if (prediction<=-1.0 || truth<=-1.0)
00033         {
00034             SG_WARNING("Negative label[%d] in %s is not allowed, ignoring!\n",
00035                     i, get_name());
00036             continue;
00037         }
00038 
00039         float64_t a=CMath::log(prediction+1);
00040         float64_t b=CMath::log(truth+1);
00041         msle+=CMath::sq(a-b);
00042     }
00043     msle /= length;
00044     return CMath::sqrt(msle);
00045 }
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