GaussianShortRealKernel.cpp
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00011 #include "lib/common.h"
00012 #include "kernel/GaussianShortRealKernel.h"
00013 #include "features/Features.h"
00014 #include "features/SimpleFeatures.h"
00015 #include "lib/io.h"
00016
00017 CGaussianShortRealKernel::CGaussianShortRealKernel(int32_t size, float64_t w)
00018 : CSimpleKernel<float32_t>(size), width(w)
00019 {
00020 }
00021
00022 CGaussianShortRealKernel::CGaussianShortRealKernel(
00023 CSimpleFeatures<float32_t>* l, CSimpleFeatures<float32_t>* r, float64_t w, int32_t size)
00024 : CSimpleKernel<float32_t>(size), width(w)
00025 {
00026 init(l,r);
00027 }
00028
00029 CGaussianShortRealKernel::~CGaussianShortRealKernel()
00030 {
00031 }
00032
00033 bool CGaussianShortRealKernel::init(CFeatures* l, CFeatures* r)
00034 {
00035 CSimpleKernel<float32_t>::init(l, r);
00036 return init_normalizer();
00037 }
00038
00039 bool CGaussianShortRealKernel::load_init(FILE* src)
00040 {
00041 return false;
00042 }
00043
00044 bool CGaussianShortRealKernel::save_init(FILE* dest)
00045 {
00046 return false;
00047 }
00048
00049 float64_t CGaussianShortRealKernel::compute(int32_t idx_a, int32_t idx_b)
00050 {
00051 int32_t alen, blen;
00052 bool afree, bfree;
00053
00054 float32_t* avec=((CSimpleFeatures<float32_t>*) lhs)->get_feature_vector(idx_a, alen, afree);
00055 float32_t* bvec=((CSimpleFeatures<float32_t>*) rhs)->get_feature_vector(idx_b, blen, bfree);
00056 ASSERT(alen==blen);
00057
00058 float64_t result=0;
00059 for (int32_t i=0; i<alen; i++)
00060 result+=CMath::sq(avec[i]-bvec[i]);
00061
00062 result=exp(-result/width);
00063
00064 ((CSimpleFeatures<float32_t>*) lhs)->free_feature_vector(avec, idx_a, afree);
00065 ((CSimpleFeatures<float32_t>*) rhs)->free_feature_vector(bvec, idx_b, bfree);
00066
00067 return result;
00068 }