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00011 #include <shogun/lib/config.h>
00012 #include <shogun/lib/common.h>
00013 #include <shogun/io/SGIO.h>
00014 #include <shogun/distance/CanberraMetric.h>
00015 #include <shogun/features/Features.h>
00016 #include <shogun/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 }