PolyKernel.cpp
Go to the documentation of this file.00001
00002
00003
00004
00005
00006
00007
00008
00009
00010
00011 #include "lib/config.h"
00012 #include "lib/common.h"
00013 #include "lib/io.h"
00014 #include "kernel/PolyKernel.h"
00015 #include "kernel/SqrtDiagKernelNormalizer.h"
00016 #include "features/SimpleFeatures.h"
00017
00018 CPolyKernel::CPolyKernel(int32_t size, int32_t d, bool i)
00019 : CSimpleKernel<float64_t>(size), degree(d), inhomogene(i)
00020 {
00021 set_normalizer(new CSqrtDiagKernelNormalizer());
00022 }
00023
00024 CPolyKernel::CPolyKernel(
00025 CSimpleFeatures<float64_t>* l, CSimpleFeatures<float64_t>* r, int32_t d, bool i, int32_t size)
00026 : CSimpleKernel<float64_t>(size), degree(d), inhomogene(i)
00027 {
00028 set_normalizer(new CSqrtDiagKernelNormalizer());
00029 init(l,r);
00030 }
00031
00032 CPolyKernel::~CPolyKernel()
00033 {
00034 cleanup();
00035 }
00036
00037 bool CPolyKernel::init(CFeatures* l, CFeatures* r)
00038 {
00039 CSimpleKernel<float64_t>::init(l,r);
00040 return init_normalizer();
00041 }
00042
00043 void CPolyKernel::cleanup()
00044 {
00045 CKernel::cleanup();
00046 }
00047
00048 bool CPolyKernel::load_init(FILE* src)
00049 {
00050 return false;
00051 }
00052
00053 bool CPolyKernel::save_init(FILE* dest)
00054 {
00055 return false;
00056 }
00057
00058 float64_t CPolyKernel::compute(int32_t idx_a, int32_t idx_b)
00059 {
00060 int32_t alen=0;
00061 int32_t blen=0;
00062 bool afree=false;
00063 bool bfree=false;
00064
00065 float64_t* avec=
00066 ((CSimpleFeatures<float64_t>*) lhs)->get_feature_vector(idx_a, alen, afree);
00067 float64_t* bvec=
00068 ((CSimpleFeatures<float64_t>*) rhs)->get_feature_vector(idx_b, blen, bfree);
00069 ASSERT(alen==blen);
00070
00071 float64_t result=CMath::dot(avec, bvec, alen);
00072
00073 if (inhomogene)
00074 result+=1;
00075
00076 result=CMath::pow(result, degree);
00077
00078 ((CSimpleFeatures<float64_t>*) lhs)->free_feature_vector(avec, idx_a, afree);
00079 ((CSimpleFeatures<float64_t>*) rhs)->free_feature_vector(bvec, idx_b, bfree);
00080
00081 return result;
00082 }