Distribution.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) 1999-2009 Soeren Sonnenburg
00008  * Copyright (C) 1999-2009 Fraunhofer Institute FIRST and Max-Planck-Society
00009  */
00010 
00011 #include <shogun/distributions/Distribution.h>
00012 #include <shogun/mathematics/Math.h>
00013 
00014 using namespace shogun;
00015 
00016 CDistribution::CDistribution()
00017 : CSGObject(), features(NULL), pseudo_count(1e-10)
00018 {
00019 }
00020 
00021 
00022 CDistribution::~CDistribution()
00023 {
00024 }
00025 
00026 float64_t CDistribution::get_log_likelihood_sample()
00027 {
00028     ASSERT(features);
00029 
00030     float64_t sum=0;
00031     for (int32_t i=0; i<features->get_num_vectors(); i++)
00032         sum+=get_log_likelihood_example(i);
00033 
00034     return sum/features->get_num_vectors();
00035 }
00036 
00037 SGVector<float64_t> CDistribution::get_log_likelihood()
00038 {
00039     ASSERT(features);
00040 
00041     int32_t num=features->get_num_vectors();
00042     float64_t* vec=SG_MALLOC(float64_t, num);
00043 
00044     for (int32_t i=0; i<num; i++)
00045         vec[i]=get_log_likelihood_example(i);
00046 
00047     return SGVector<float64_t>(vec,num);
00048 }
00049 
00050 int32_t CDistribution::get_num_relevant_model_parameters()
00051 {
00052     int32_t total_num=get_num_model_parameters();
00053     int32_t num=0;
00054 
00055     for (int32_t i=0; i<total_num; i++)
00056     {
00057         if (get_log_model_parameter(i)>CMath::ALMOST_NEG_INFTY)
00058             num++;
00059     }
00060     return num;
00061 }
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