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00011 #ifndef _HASHEDWDFEATURESTRANSPOSED_H___
00012 #define _HASHEDWDFEATURESTRANSPOSED_H___
00013
00014 #include "lib/common.h"
00015 #include "features/DotFeatures.h"
00016 #include "features/StringFeatures.h"
00017 #include "lib/Hash.h"
00018
00019 namespace shogun
00020 {
00021 template <class ST> class CStringFeatures;
00022
00028 class CHashedWDFeaturesTransposed : public CDotFeatures
00029 {
00030 public:
00032 CHashedWDFeaturesTransposed(void);
00033
00042 CHashedWDFeaturesTransposed(CStringFeatures<uint8_t>* str, int32_t start_order,
00043 int32_t order, int32_t from_order, int32_t hash_bits=12);
00044
00046 CHashedWDFeaturesTransposed(const CHashedWDFeaturesTransposed & orig);
00047
00049 virtual ~CHashedWDFeaturesTransposed();
00050
00058 inline virtual int32_t get_dim_feature_space()
00059 {
00060 return w_dim;
00061 }
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
00091 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);
00092
00104 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);
00105
00106
00115 virtual void add_to_dense_vec(float64_t alpha, int32_t vec_idx1, float64_t* vec2, int32_t vec2_len, bool abs_val=false);
00116
00122 virtual inline int32_t get_nnz_features_for_vector(int32_t num)
00123 {
00124 return w_dim/alphabet_size;
00125 }
00126
00131 virtual CFeatures* duplicate() const;
00132
00137 inline virtual EFeatureType get_feature_type()
00138 {
00139 return F_UNKNOWN;
00140 }
00141
00146 inline virtual EFeatureClass get_feature_class()
00147 {
00148 return C_WD;
00149 }
00150
00151 inline virtual int32_t get_num_vectors()
00152 {
00153 return num_strings;
00154 }
00155
00156 inline virtual int32_t get_size()
00157 {
00158 return sizeof(float64_t);
00159 }
00160
00163 void set_normalization_const(float64_t n=0);
00164
00166 inline float64_t get_normalization_const()
00167 {
00168 return normalization_const;
00169 }
00170
00172 struct hashed_wd_transposed_feature_iterator
00173 {
00175 uint16_t* vec;
00177 int32_t vidx;
00179 int32_t vlen;
00181 bool vfree;
00182
00184 int32_t index;
00185
00186 };
00187
00197 virtual void* get_feature_iterator(int32_t vector_index)
00198 {
00199 SG_NOTIMPLEMENTED;
00200 return NULL;
00201 }
00202
00213 virtual bool get_next_feature(int32_t& index, float64_t& value, void* iterator)
00214 {
00215 SG_NOTIMPLEMENTED;
00216 return NULL;
00217 }
00218
00224 virtual void free_feature_iterator(void* iterator)
00225 {
00226 SG_NOTIMPLEMENTED;
00227 }
00228
00230 inline virtual const char* get_name() const { return "HashedWDFeaturesTransposed"; }
00231
00232 protected:
00233
00235 void set_wd_weights();
00236 static void* dense_dot_range_helper(void* p);
00237
00238 protected:
00240 CStringFeatures<uint8_t>* strings;
00241
00243 TString<uint8_t>* transposed_strings;
00244
00246 int32_t degree;
00248 int32_t start_degree;
00250 int32_t from_degree;
00252 int32_t string_length;
00254 int32_t num_strings;
00256 int32_t alphabet_size;
00258 int32_t w_dim;
00260 int32_t partial_w_dim;
00262 float64_t* wd_weights;
00264 uint32_t mask;
00266 int32_t m_hash_bits;
00267
00269 float64_t normalization_const;
00270 };
00271 }
00272 #endif // _HASHEDWDFEATURESTRANSPOSED_H___