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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:
00031
00040 CHashedWDFeaturesTransposed(CStringFeatures<uint8_t>* str, int32_t start_order,
00041 int32_t order, int32_t from_order, int32_t hash_bits=12);
00042
00044 CHashedWDFeaturesTransposed(const CHashedWDFeaturesTransposed & orig);
00045
00047 virtual ~CHashedWDFeaturesTransposed();
00048
00056 inline virtual int32_t get_dim_feature_space()
00057 {
00058 return w_dim;
00059 }
00060
00067 virtual float64_t dot(int32_t vec_idx1, int32_t vec_idx2);
00068
00075 virtual float64_t dense_dot(int32_t vec_idx1, const float64_t* vec2, int32_t vec2_len);
00076
00088 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);
00089
00101 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);
00102
00103
00112 virtual void add_to_dense_vec(float64_t alpha, int32_t vec_idx1, float64_t* vec2, int32_t vec2_len, bool abs_val=false);
00113
00119 virtual inline int32_t get_nnz_features_for_vector(int32_t num)
00120 {
00121 return w_dim/alphabet_size;
00122 }
00123
00128 virtual CFeatures* duplicate() const;
00129
00134 inline virtual EFeatureType get_feature_type()
00135 {
00136 return F_UNKNOWN;
00137 }
00138
00143 inline virtual EFeatureClass get_feature_class()
00144 {
00145 return C_WD;
00146 }
00147
00148 inline virtual int32_t get_num_vectors()
00149 {
00150 return num_strings;
00151 }
00152
00153 inline virtual int32_t get_size()
00154 {
00155 return sizeof(float64_t);
00156 }
00157
00160 void set_normalization_const(float64_t n=0);
00161
00163 inline float64_t get_normalization_const()
00164 {
00165 return normalization_const;
00166 }
00167
00169 struct hashed_wd_transposed_feature_iterator
00170 {
00172 uint16_t* vec;
00174 int32_t vidx;
00176 int32_t vlen;
00178 bool vfree;
00179
00181 int32_t index;
00182
00183 };
00184
00194 virtual void* get_feature_iterator(int32_t vector_index)
00195 {
00196 SG_NOTIMPLEMENTED;
00197 return NULL;
00198 }
00199
00210 virtual bool get_next_feature(int32_t& index, float64_t& value, void* iterator)
00211 {
00212 SG_NOTIMPLEMENTED;
00213 return NULL;
00214 }
00215
00221 virtual void free_feature_iterator(void* iterator)
00222 {
00223 SG_NOTIMPLEMENTED;
00224 }
00225
00227 inline virtual const char* get_name() const { return "HashedWDFeaturesTransposed"; }
00228
00229 protected:
00230
00232 void set_wd_weights();
00233 static void* dense_dot_range_helper(void* p);
00234
00235 protected:
00237 CStringFeatures<uint8_t>* strings;
00238
00240 T_STRING<uint8_t>* transposed_strings;
00241
00243 int32_t degree;
00245 int32_t start_degree;
00247 int32_t from_degree;
00249 int32_t string_length;
00251 int32_t num_strings;
00253 int32_t alphabet_size;
00255 int32_t w_dim;
00257 int32_t partial_w_dim;
00259 float64_t* wd_weights;
00261 uint32_t mask;
00263 int32_t m_hash_bits;
00264
00266 float64_t normalization_const;
00267 };
00268 }
00269 #endif // _HASHEDWDFEATURESTRANSPOSED_H___