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00011 #include <shogun/lib/common.h>
00012 #include <shogun/io/SGIO.h>
00013 #include <shogun/distance/AttenuatedEuclidianDistance.h>
00014 #include <shogun/features/Features.h>
00015 #include <shogun/features/SimpleFeatures.h>
00016
00017 using namespace shogun;
00018
00019 CAttenuatedEuclidianDistance::CAttenuatedEuclidianDistance() : CRealDistance()
00020 {
00021 init();
00022 }
00023
00024 CAttenuatedEuclidianDistance::CAttenuatedEuclidianDistance(CSimpleFeatures<float64_t>* l, CSimpleFeatures<float64_t>* r)
00025 : CRealDistance()
00026 {
00027 init();
00028 init(l, r);
00029 }
00030
00031 CAttenuatedEuclidianDistance::~CAttenuatedEuclidianDistance()
00032 {
00033 cleanup();
00034 }
00035
00036 bool CAttenuatedEuclidianDistance::init(CFeatures* l, CFeatures* r)
00037 {
00038 CRealDistance::init(l, r);
00039 return true;
00040 }
00041
00042 void CAttenuatedEuclidianDistance::cleanup()
00043 {
00044 }
00045
00046 float64_t CAttenuatedEuclidianDistance::compute(int32_t idx_a, int32_t idx_b)
00047 {
00048 int32_t alen, blen;
00049 bool afree, bfree;
00050 float64_t result=0;
00051
00052 float64_t* avec=((CSimpleFeatures<float64_t>*) lhs)->
00053 get_feature_vector(idx_a, alen, afree);
00054 float64_t* bvec=((CSimpleFeatures<float64_t>*) rhs)->
00055 get_feature_vector(idx_b, blen, bfree);
00056 ASSERT(alen==blen);
00057
00058 for (int32_t i=0; i<alen; i++)
00059 result+=(CMath::abs(avec[i])*CMath::abs(bvec[i]))*CMath::pow(avec[i] - bvec[i],2);
00060
00061 ((CSimpleFeatures<float64_t>*) lhs)->free_feature_vector(avec, idx_a, afree);
00062 ((CSimpleFeatures<float64_t>*) rhs)->free_feature_vector(bvec, idx_b, bfree);
00063
00064 if (disable_sqrt)
00065 return result;
00066
00067 return CMath::sqrt(result);
00068 }
00069
00070 void CAttenuatedEuclidianDistance::init()
00071 {
00072 disable_sqrt=false;
00073
00074 m_parameters->add(&disable_sqrt, "disable_sqrt", "If sqrt shall not be applied.");
00075 }