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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 }