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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), normal(NULL), normal_length(0)
00022 {
00023 properties |= KP_LINADD;
00024 }
00025
00026 CLinearKernel::CLinearKernel(CDotFeatures* l, CDotFeatures* r)
00027 : CDotKernel(0), normal(NULL), normal_length(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::clear_normal()
00053 {
00054 int32_t num = ((CDotFeatures*) lhs)->get_dim_feature_space();
00055 if (normal==NULL)
00056 {
00057 normal = SG_MALLOC(float64_t, num);
00058 normal_length=num;
00059 }
00060
00061 memset(normal, 0, sizeof(float64_t)*normal_length);
00062
00063 set_is_initialized(true);
00064 }
00065
00066 void CLinearKernel::add_to_normal(int32_t idx, float64_t weight)
00067 {
00068 ((CDotFeatures*) lhs)->add_to_dense_vec(
00069 normalizer->normalize_lhs(weight, idx), idx, normal, normal_length);
00070 set_is_initialized(true);
00071 }
00072
00073 bool CLinearKernel::init_optimization(
00074 int32_t num_suppvec, int32_t* sv_idx, float64_t* alphas)
00075 {
00076 clear_normal();
00077
00078 for (int32_t i=0; i<num_suppvec; i++)
00079 add_to_normal(sv_idx[i], alphas[i]);
00080
00081 set_is_initialized(true);
00082 return true;
00083 }
00084
00085 bool CLinearKernel::init_optimization(CKernelMachine* km)
00086 {
00087 clear_normal();
00088
00089 int32_t num_suppvec=km->get_num_support_vectors();
00090
00091 for (int32_t i=0; i<num_suppvec; i++)
00092 add_to_normal(km->get_support_vector(i), km->get_alpha(i));
00093
00094 set_is_initialized(true);
00095 return true;
00096 }
00097
00098 bool CLinearKernel::delete_optimization()
00099 {
00100 SG_FREE(normal);
00101 normal_length=0;
00102 normal=NULL;
00103 set_is_initialized(false);
00104
00105 return true;
00106 }
00107
00108 float64_t CLinearKernel::compute_optimized(int32_t idx)
00109 {
00110 ASSERT(get_is_initialized());
00111 float64_t result = ((CDotFeatures*) rhs)->
00112 dense_dot(idx, normal, normal_length);
00113 return normalizer->normalize_rhs(result, idx);
00114 }