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00012 #ifndef _DOTFEATURES_H___
00013 #define _DOTFEATURES_H___
00014
00015 #include "lib/common.h"
00016 #include "lib/Time.h"
00017 #include "lib/Mathematics.h"
00018 #include "features/Features.h"
00019
00020 namespace shogun
00021 {
00043 class CDotFeatures : public CFeatures
00044 {
00045 public:
00046
00051 CDotFeatures(int32_t size=0) : CFeatures(size), combined_weight(1.0)
00052 {
00053 set_property(FP_DOT);
00054 }
00055
00057 CDotFeatures(const CDotFeatures & orig) :
00058 CFeatures(orig), combined_weight(orig.combined_weight) {}
00059
00064 CDotFeatures(CFile* loader) : CFeatures(loader) {}
00065
00066 virtual ~CDotFeatures() { }
00067
00075 virtual int32_t get_dim_feature_space()=0;
00076
00083 virtual float64_t dot(int32_t vec_idx1, int32_t vec_idx2)=0;
00084
00091 virtual float64_t dense_dot(int32_t vec_idx1, const float64_t* vec2, int32_t vec2_len)=0;
00092
00101 virtual void add_to_dense_vec(float64_t alpha, int32_t vec_idx1, float64_t* vec2, int32_t vec2_len, bool abs_val=false)=0;
00102
00116 virtual void dense_dot_range(float64_t* output, int32_t start, int32_t stop, float64_t* alphas, float64_t* vec, int32_t dim, float64_t b);
00117
00129 virtual void dense_dot_range_subset(int32_t* sub_index, int32_t num, float64_t* output, float64_t* alphas, float64_t* vec, int32_t dim, float64_t b);
00130
00133 static void* dense_dot_range_helper(void* p);
00134
00142 virtual int32_t get_nnz_features_for_vector(int32_t num)=0;
00143
00148 inline float64_t get_combined_feature_weight() { return combined_weight; }
00149
00154 inline void set_combined_feature_weight(float64_t nw) { combined_weight=nw; }
00155
00163 virtual void get_feature_matrix(float64_t** dst, int32_t* num_feat, int32_t* num_vec);
00164
00172 virtual void get_feature_vector(float64_t** dst, int32_t* len, int32_t num);
00173
00175 void benchmark_add_to_dense_vector(int32_t repeats=5);
00176
00178 void benchmark_dense_dot_range(int32_t repeats=5);
00179
00189 virtual void* get_feature_iterator(int32_t vector_index)=0;
00190
00201 virtual bool get_next_feature(int32_t& index, float64_t& value, void* iterator)=0;
00202
00208 virtual void free_feature_iterator(void* iterator)=0;
00209
00210 protected:
00217 inline void display_progress(int32_t start, int32_t stop, int32_t v)
00218 {
00219 int32_t num_vectors=stop-start;
00220 int32_t i=v-start;
00221
00222 if ( (i% (num_vectors/100+1))== 0)
00223 SG_PROGRESS(v, 0.0, num_vectors-1);
00224 }
00225
00226 #ifdef HAVE_BOOST_SERIALIZATION
00227 friend class ::boost::serialization::access;
00228
00229
00230
00231 template<class Archive>
00232 void serialize(Archive & ar, const unsigned int archive_version)
00233 {
00234
00235 SG_DEBUG("archiving DotFeatures\n");
00236
00237 ar & ::boost::serialization::base_object<CFeatures>(*this);
00238 ar & combined_weight;
00239
00240 SG_DEBUG("done with DotFeatures\n");
00241 }
00242
00243 #endif //HAVE_BOOST_SERIALIZATION
00244
00245 protected:
00246
00248 float64_t combined_weight;
00249 };
00250 }
00251 #endif // _DOTFEATURES_H___