Go to the documentation of this file.00001
00002
00003
00004
00005
00006
00007
00008
00009
00010
00011 #include <math.h>
00012 #include <shogun/kernel/TStudentKernel.h>
00013 #include <shogun/mathematics/Math.h>
00014
00015 using namespace shogun;
00016
00017 void CTStudentKernel::init()
00018 {
00019 SG_ADD(°ree, "degree", "Kernel degree.", MS_AVAILABLE);
00020 SG_ADD((CSGObject**) &distance, "distance", "Distance to be used.",
00021 MS_AVAILABLE);
00022 }
00023
00024 CTStudentKernel::CTStudentKernel(): CKernel(0), distance(NULL), degree(1.0)
00025 {
00026 init();
00027 }
00028
00029 CTStudentKernel::CTStudentKernel(int32_t cache, float64_t d, CDistance* dist)
00030 : CKernel(cache), distance(dist), degree(d)
00031 {
00032 init();
00033 ASSERT(distance);
00034 SG_REF(distance);
00035 }
00036
00037 CTStudentKernel::CTStudentKernel(CFeatures *l, CFeatures *r, float64_t d, CDistance* dist)
00038 : CKernel(10), distance(dist), degree(d)
00039 {
00040 init();
00041 ASSERT(distance);
00042 SG_REF(distance);
00043 init(l, r);
00044 }
00045
00046 CTStudentKernel::~CTStudentKernel()
00047 {
00048 cleanup();
00049 SG_UNREF(distance);
00050 }
00051
00052 bool CTStudentKernel::init(CFeatures* l, CFeatures* r)
00053 {
00054 ASSERT(distance);
00055 CKernel::init(l,r);
00056 distance->init(l,r);
00057 return init_normalizer();
00058 }
00059
00060 float64_t CTStudentKernel::compute(int32_t idx_a, int32_t idx_b)
00061 {
00062 float64_t dist = distance->distance(idx_a, idx_b);
00063 return 1.0/(1.0+CMath::pow(dist, this->degree));
00064 }