CanberraMetric.cpp
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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/RealFeatures.h"
00017
00018 CCanberraMetric::CCanberraMetric()
00019 : CSimpleDistance<DREAL>()
00020 {
00021 }
00022
00023 CCanberraMetric::CCanberraMetric(CRealFeatures* l, CRealFeatures* r)
00024 : CSimpleDistance<DREAL>()
00025 {
00026 init(l, r);
00027 }
00028
00029 CCanberraMetric::~CCanberraMetric()
00030 {
00031 cleanup();
00032 }
00033
00034 bool CCanberraMetric::init(CFeatures* l, CFeatures* r)
00035 {
00036 bool result=CSimpleDistance<DREAL>::init(l,r);
00037
00038 return result;
00039 }
00040
00041 void CCanberraMetric::cleanup()
00042 {
00043 }
00044
00045 bool CCanberraMetric::load_init(FILE* src)
00046 {
00047 return false;
00048 }
00049
00050 bool CCanberraMetric::save_init(FILE* dest)
00051 {
00052 return false;
00053 }
00054
00055 DREAL CCanberraMetric::compute(INT idx_a, INT idx_b)
00056 {
00057
00058 INT alen, blen;
00059 bool afree, bfree;
00060
00061 double* avec=((CRealFeatures*) lhs)->get_feature_vector(idx_a, alen, afree);
00062 double* bvec=((CRealFeatures*) rhs)->get_feature_vector(idx_b, blen, bfree);
00063
00064 ASSERT(alen==blen);
00065
00066 DREAL absTmp = 0;
00067 DREAL result=0;
00068 {
00069 for (INT i=0; i<alen; i++)
00070 {
00071 absTmp=fabs(avec[i])+fabs(bvec[i]);
00072 if(absTmp!=0)
00073 result+=fabs(avec[i]-fabs(bvec[i]))/absTmp;
00074 }
00075
00076 }
00077
00078 ((CRealFeatures*) lhs)->free_feature_vector(avec, idx_a, afree);
00079 ((CRealFeatures*) rhs)->free_feature_vector(bvec, idx_b, bfree);
00080
00081 return result;
00082 }