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00012 #ifndef _IMPLICITSPECFEATURES_H___
00013 #define _IMPLICITSPECFEATURES_H___
00014
00015 #include <shogun/lib/common.h>
00016 #include <shogun/io/SGIO.h>
00017 #include <shogun/features/DotFeatures.h>
00018 #include <shogun/features/StringFeatures.h>
00019
00020 namespace shogun
00021 {
00022
00023 template <class ST> class CStringFeatures;
00024
00030 class CImplicitWeightedSpecFeatures : public CDotFeatures
00031 {
00032 public:
00034 CImplicitWeightedSpecFeatures();
00035
00041 CImplicitWeightedSpecFeatures(CStringFeatures<uint16_t>* str, bool normalize=true);
00042
00044 CImplicitWeightedSpecFeatures(const CImplicitWeightedSpecFeatures & orig);
00045
00046 virtual ~CImplicitWeightedSpecFeatures();
00047
00052 virtual CFeatures* duplicate() const;
00053
00061 virtual int32_t get_dim_feature_space() const;
00062
00070 virtual float64_t dot(int32_t vec_idx1, CDotFeatures* df, int32_t vec_idx2);
00071
00078 virtual float64_t dense_dot(int32_t vec_idx1, const float64_t* vec2, int32_t vec2_len);
00079
00088 virtual void add_to_dense_vec(float64_t alpha, int32_t vec_idx1,
00089 float64_t* vec2, int32_t vec2_len, bool abs_val=false);
00090
00096 virtual int32_t get_nnz_features_for_vector(int32_t num);
00097
00102 virtual EFeatureType get_feature_type() const;
00103
00108 virtual EFeatureClass get_feature_class() const;
00109
00114 virtual int32_t get_num_vectors() const;
00115
00120 virtual int32_t get_size() const;
00121
00126 bool set_wd_weights();
00127
00134 bool set_weights(float64_t* w, int32_t d);
00135
00136 #ifndef DOXYGEN_SHOULD_SKIP_THIS
00137
00138 struct wspec_feature_iterator
00139 {
00141 uint16_t* vec;
00143 int32_t vidx;
00145 int32_t vlen;
00147 bool vfree;
00148
00153 int32_t offs;
00154 int32_t d;
00155 int32_t j;
00156 uint8_t mask;
00157 float64_t alpha;
00159 };
00160 #endif
00161
00171 virtual void* get_feature_iterator(int32_t vector_index);
00172
00183 virtual bool get_next_feature(int32_t& index, float64_t& value, void* iterator);
00184
00190 virtual void free_feature_iterator(void* iterator);
00191
00193 virtual const char* get_name() const { return "ImplicitWeightedSpecFeatures"; }
00194
00195 protected:
00200 void compute_normalization_const();
00201
00202 protected:
00204 CStringFeatures<uint16_t>* strings;
00205
00207 float64_t* normalization_factors;
00209 int32_t num_strings;
00211 int32_t alphabet_size;
00212
00214 int32_t degree;
00216 int32_t spec_size;
00217
00219 float64_t* spec_weights;
00220 };
00221 }
00222 #endif // _IMPLICITSPECFEATURES_H___