DistanceKernel.cpp
Go to the documentation of this file.00001
00002
00003
00004
00005
00006
00007
00008
00009
00010
00011 #include "lib/config.h"
00012
00013 #include "lib/common.h"
00014 #include "lib/io.h"
00015 #include "kernel/DistanceKernel.h"
00016 #include "features/SimpleFeatures.h"
00017
00018 using namespace shogun;
00019
00020 CDistanceKernel::CDistanceKernel(int32_t size, float64_t w, CDistance* d)
00021 : CKernel(size), distance(d), width(w)
00022 {
00023 ASSERT(distance);
00024 SG_REF(distance);
00025 }
00026
00027 CDistanceKernel::CDistanceKernel(
00028 CFeatures *l, CFeatures *r, float64_t w , CDistance* d)
00029 : CKernel(10), distance(d), width(w)
00030 {
00031 ASSERT(distance);
00032 SG_REF(distance);
00033 init(l, r);
00034 }
00035
00036 CDistanceKernel::~CDistanceKernel()
00037 {
00038
00039
00040 cleanup();
00041 SG_UNREF(distance);
00042 }
00043
00044 bool CDistanceKernel::init(CFeatures* l, CFeatures* r)
00045 {
00046 ASSERT(distance);
00047 CKernel::init(l,r);
00048 distance->init(l,r);
00049 return init_normalizer();
00050 }
00051
00052 float64_t CDistanceKernel::compute(int32_t idx_a, int32_t idx_b)
00053 {
00054 float64_t result=distance->distance(idx_a, idx_b);
00055 return exp(-result/width);
00056 }