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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 void init(void);
00046
00047 public:
00048
00053 CDotFeatures(int32_t size=0);
00054
00056 CDotFeatures(const CDotFeatures & orig);
00057
00062 CDotFeatures(CFile* loader);
00063
00064 virtual ~CDotFeatures() { }
00065
00073 virtual int32_t get_dim_feature_space()=0;
00074
00082 virtual float64_t dot(int32_t vec_idx1, CDotFeatures* df, int32_t vec_idx2)=0;
00083
00090 virtual float64_t dense_dot(int32_t vec_idx1, const float64_t* vec2, int32_t vec2_len)=0;
00091
00100 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;
00101
00115 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);
00116
00128 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);
00129
00132 static void* dense_dot_range_helper(void* p);
00133
00141 virtual int32_t get_nnz_features_for_vector(int32_t num)=0;
00142
00147 inline float64_t get_combined_feature_weight() { return combined_weight; }
00148
00153 inline void set_combined_feature_weight(float64_t nw) { combined_weight=nw; }
00154
00162 virtual void get_feature_matrix(float64_t** dst, int32_t* num_feat, int32_t* num_vec);
00163
00171 virtual void get_feature_vector(float64_t** dst, int32_t* len, int32_t num);
00172
00174 void benchmark_add_to_dense_vector(int32_t repeats=5);
00175
00177 void benchmark_dense_dot_range(int32_t repeats=5);
00178
00188 virtual void* get_feature_iterator(int32_t vector_index)=0;
00189
00200 virtual bool get_next_feature(int32_t& index, float64_t& value, void* iterator)=0;
00201
00207 virtual void free_feature_iterator(void* iterator)=0;
00208
00209 protected:
00216 inline void display_progress(int32_t start, int32_t stop, int32_t v)
00217 {
00218 int32_t num_vectors=stop-start;
00219 int32_t i=v-start;
00220
00221 if ( (i% (num_vectors/100+1))== 0)
00222 SG_PROGRESS(v, 0.0, num_vectors-1);
00223 }
00224
00225 protected:
00226
00228 float64_t combined_weight;
00229 };
00230 }
00231 #endif // _DOTFEATURES_H___