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00012 #include <shogun/lib/common.h>
00013 #include <shogun/io/SGIO.h>
00014 #include <shogun/features/Features.h>
00015 #include <shogun/features/DotFeatures.h>
00016 #include <shogun/kernel/LinearKernel.h>
00017
00018 using namespace shogun;
00019
00020 CLinearKernel::CLinearKernel()
00021 : CDotKernel(0)
00022 {
00023 properties |= KP_LINADD;
00024 }
00025
00026 CLinearKernel::CLinearKernel(CDotFeatures* l, CDotFeatures* r)
00027 : CDotKernel(0)
00028 {
00029 properties |= KP_LINADD;
00030 init(l,r);
00031 }
00032
00033 CLinearKernel::~CLinearKernel()
00034 {
00035 cleanup();
00036 }
00037
00038 bool CLinearKernel::init(CFeatures* l, CFeatures* r)
00039 {
00040 CDotKernel::init(l, r);
00041
00042 return init_normalizer();
00043 }
00044
00045 void CLinearKernel::cleanup()
00046 {
00047 delete_optimization();
00048
00049 CKernel::cleanup();
00050 }
00051
00052 void CLinearKernel::add_to_normal(int32_t idx, float64_t weight)
00053 {
00054 ((CDotFeatures*) lhs)->add_to_dense_vec(
00055 normalizer->normalize_lhs(weight, idx), idx, normal.vector, normal.size());
00056 set_is_initialized(true);
00057 }
00058
00059 bool CLinearKernel::init_optimization(
00060 int32_t num_suppvec, int32_t* sv_idx, float64_t* alphas)
00061 {
00062 clear_normal();
00063
00064 for (int32_t i=0; i<num_suppvec; i++)
00065 add_to_normal(sv_idx[i], alphas[i]);
00066
00067 set_is_initialized(true);
00068 return true;
00069 }
00070
00071 bool CLinearKernel::init_optimization(CKernelMachine* km)
00072 {
00073 clear_normal();
00074
00075 int32_t num_suppvec=km->get_num_support_vectors();
00076
00077 for (int32_t i=0; i<num_suppvec; i++)
00078 add_to_normal(km->get_support_vector(i), km->get_alpha(i));
00079
00080 set_is_initialized(true);
00081 return true;
00082 }
00083
00084 bool CLinearKernel::delete_optimization()
00085 {
00086 normal = SGVector<float64_t>();
00087 set_is_initialized(false);
00088
00089 return true;
00090 }
00091
00092 float64_t CLinearKernel::compute_optimized(int32_t idx)
00093 {
00094 ASSERT(get_is_initialized());
00095 float64_t result = ((CDotFeatures*) rhs)->
00096 dense_dot(idx, normal.vector, normal.size());
00097 return normalizer->normalize_rhs(result, idx);
00098 }