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00012 #ifndef _WDFEATURES_H___
00013 #define _WDFEATURES_H___
00014
00015 #include <shogun/lib/common.h>
00016 #include <shogun/features/DotFeatures.h>
00017 #include <shogun/features/StringFeatures.h>
00018
00019 namespace shogun
00020 {
00021 template <class ST> class CStringFeatures;
00022
00028 class CWDFeatures : public CDotFeatures
00029 {
00030 public:
00032 CWDFeatures();
00033
00040 CWDFeatures(CStringFeatures<uint8_t>* str, int32_t order, int32_t from_order);
00041
00043 CWDFeatures(const CWDFeatures & orig);
00044
00046 virtual ~CWDFeatures();
00047
00055 virtual int32_t get_dim_feature_space() const;
00056
00064 virtual float64_t dot(int32_t vec_idx1, CDotFeatures* df, int32_t vec_idx2);
00065
00072 virtual float64_t dense_dot(int32_t vec_idx1, const float64_t* vec2, int32_t vec2_len);
00073
00082 virtual void add_to_dense_vec(float64_t alpha, int32_t vec_idx1,
00083 float64_t* vec2, int32_t vec2_len, bool abs_val=false);
00084
00090 virtual int32_t get_nnz_features_for_vector(int32_t num);
00091
00092 #ifndef DOXYGEN_SHOULD_SKIP_THIS
00093
00094 struct wd_feature_iterator
00095 {
00097 uint8_t* vec;
00099 int32_t vidx;
00101 int32_t vlen;
00103 bool vfree;
00104
00109 int32_t lim;
00110 int32_t* val;
00111 int32_t asize;
00112 int32_t asizem1;
00113 int32_t offs;
00114 int32_t k;
00115 int32_t i;
00116 int32_t o;
00118 };
00119 #endif
00120
00130 virtual void* get_feature_iterator(int32_t vector_index);
00131
00142 virtual bool get_next_feature(int32_t& index, float64_t& value, void* iterator);
00143
00149 virtual void free_feature_iterator(void* iterator);
00150
00155 virtual CFeatures* duplicate() const;
00156
00161 virtual EFeatureType get_feature_type() const;
00162
00167 virtual EFeatureClass get_feature_class() const;
00168
00169 virtual int32_t get_num_vectors() const;
00170
00171 virtual int32_t get_size() const;
00172
00175 void set_normalization_const(float64_t n=0);
00176
00178 float64_t get_normalization_const();
00179
00181 virtual const char* get_name() const { return "WDFeatures"; }
00182
00187 void set_wd_weights(SGVector<float64_t> weights);
00188
00190 void set_wd_weights();
00191
00192 protected:
00194 CStringFeatures<uint8_t>* strings;
00195
00197 int32_t degree;
00199 int32_t from_degree;
00201 int32_t string_length;
00203 int32_t num_strings;
00205 int32_t alphabet_size;
00207 int32_t w_dim;
00209 float64_t* wd_weights;
00210
00212 float64_t normalization_const;
00213
00214 };
00215 }
00216 #endif // _WDFEATURES_H___