SHOGUN v0.9.0
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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) 2006-2009 Christian Gehl 00008 * Copyright (C) 2006-2009 Fraunhofer Institute FIRST 00009 */ 00010 00011 #include "lib/config.h" 00012 #include "lib/common.h" 00013 #include "lib/io.h" 00014 #include "distance/CanberraMetric.h" 00015 #include "features/Features.h" 00016 #include "features/SimpleFeatures.h" 00017 00018 using namespace shogun; 00019 00020 CCanberraMetric::CCanberraMetric() 00021 : CSimpleDistance<float64_t>() 00022 { 00023 } 00024 00025 CCanberraMetric::CCanberraMetric(CSimpleFeatures<float64_t>* l, CSimpleFeatures<float64_t>* r) 00026 : CSimpleDistance<float64_t>() 00027 { 00028 init(l, r); 00029 } 00030 00031 CCanberraMetric::~CCanberraMetric() 00032 { 00033 cleanup(); 00034 } 00035 00036 bool CCanberraMetric::init(CFeatures* l, CFeatures* r) 00037 { 00038 bool result=CSimpleDistance<float64_t>::init(l,r); 00039 00040 return result; 00041 } 00042 00043 void CCanberraMetric::cleanup() 00044 { 00045 } 00046 00047 float64_t CCanberraMetric::compute(int32_t idx_a, int32_t idx_b) 00048 { 00049 00050 int32_t alen, blen; 00051 bool afree, bfree; 00052 00053 float64_t* avec= 00054 ((CSimpleFeatures<float64_t>*) lhs)->get_feature_vector(idx_a, alen, afree); 00055 float64_t* bvec= 00056 ((CSimpleFeatures<float64_t>*) rhs)->get_feature_vector(idx_b, blen, bfree); 00057 00058 ASSERT(alen==blen); 00059 00060 float64_t absTmp = 0; 00061 float64_t result=0; 00062 { 00063 for (int32_t i=0; i<alen; i++) 00064 { 00065 absTmp=fabs(avec[i])+fabs(bvec[i]); 00066 if(absTmp!=0) 00067 result+=fabs(avec[i]-fabs(bvec[i]))/absTmp; 00068 } 00069 00070 } 00071 00072 ((CSimpleFeatures<float64_t>*) lhs)->free_feature_vector(avec, idx_a, afree); 00073 ((CSimpleFeatures<float64_t>*) rhs)->free_feature_vector(bvec, idx_b, bfree); 00074 00075 return result; 00076 }