SHOGUN
v3.2.0
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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) 2011 Miguel Angel Bautista 00008 * Copyright (C) 2011 Berlin Institute of Technology and Max Planck Society 00009 */ 00010 00011 #include <shogun/lib/common.h> 00012 #include <shogun/io/SGIO.h> 00013 #include <shogun/distance/AttenuatedEuclideanDistance.h> 00014 #include <shogun/features/Features.h> 00015 00016 using namespace shogun; 00017 00018 CAttenuatedEuclideanDistance::CAttenuatedEuclideanDistance() : CRealDistance() 00019 { 00020 init(); 00021 } 00022 00023 CAttenuatedEuclideanDistance::CAttenuatedEuclideanDistance(CDenseFeatures<float64_t>* l, CDenseFeatures<float64_t>* r) 00024 : CRealDistance() 00025 { 00026 init(); 00027 init(l, r); 00028 } 00029 00030 CAttenuatedEuclideanDistance::~CAttenuatedEuclideanDistance() 00031 { 00032 cleanup(); 00033 } 00034 00035 bool CAttenuatedEuclideanDistance::init(CFeatures* l, CFeatures* r) 00036 { 00037 CRealDistance::init(l, r); 00038 return true; 00039 } 00040 00041 void CAttenuatedEuclideanDistance::cleanup() 00042 { 00043 } 00044 00045 float64_t CAttenuatedEuclideanDistance::compute(int32_t idx_a, int32_t idx_b) 00046 { 00047 int32_t alen, blen; 00048 bool afree, bfree; 00049 float64_t result=0; 00050 00051 float64_t* avec=((CDenseFeatures<float64_t>*) lhs)-> 00052 get_feature_vector(idx_a, alen, afree); 00053 float64_t* bvec=((CDenseFeatures<float64_t>*) rhs)-> 00054 get_feature_vector(idx_b, blen, bfree); 00055 ASSERT(alen==blen) 00056 00057 for (int32_t i=0; i<alen; i++) 00058 result+=(CMath::abs(avec[i])*CMath::abs(bvec[i]))*CMath::pow(avec[i] - bvec[i],2); 00059 00060 ((CDenseFeatures<float64_t>*) lhs)->free_feature_vector(avec, idx_a, afree); 00061 ((CDenseFeatures<float64_t>*) rhs)->free_feature_vector(bvec, idx_b, bfree); 00062 00063 if (disable_sqrt) 00064 return result; 00065 00066 return CMath::sqrt(result); 00067 } 00068 00069 void CAttenuatedEuclideanDistance::init() 00070 { 00071 disable_sqrt=false; 00072 00073 m_parameters->add(&disable_sqrt, "disable_sqrt", "If sqrt shall not be applied."); 00074 }