SHOGUN
v3.2.0
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00001 /* 00002 * This program is free software; you can redistribute it and/or modify 00003 * it under the terms of the GNU General Public License as published by 00004 * the Free Software Foundation; either version 3 of the License, or 00005 * (at your option) any later version. 00006 * 00007 * Written (W) 2013 Evangelos Anagnostopoulos 00008 * Copyright (C) 2013 Evangelos Anagnostopoulos 00009 */ 00010 00011 #ifndef _HASHED_DENSEFEATURES_H__ 00012 #define _HASHED_DENSEFEATURES_H__ 00013 00014 #include <shogun/features/DenseFeatures.h> 00015 #include <shogun/features/DotFeatures.h> 00016 00017 namespace shogun 00018 { 00019 template <class ST> class CDenseFeatures; 00020 class CDotFeatures; 00021 00025 template <class ST> class CHashedDenseFeatures : public CDotFeatures 00026 { 00027 public: 00028 00035 CHashedDenseFeatures(int32_t size=0, bool use_quadr = false, bool keep_lin_terms = true); 00036 00044 CHashedDenseFeatures(CDenseFeatures<ST>* feats, int32_t d, bool use_quadr = false, 00045 bool keep_lin_terms = true); 00046 00054 CHashedDenseFeatures(SGMatrix<ST> matrix, int32_t dm, bool use_quadr = false, 00055 bool keep_lin_terms = true); 00056 00066 CHashedDenseFeatures(ST* src, int32_t num_feat, int32_t num_vec, int32_t d, 00067 bool use_quadr = false, bool keep_lin_terms = true); 00068 00076 CHashedDenseFeatures(CFile* loader, int32_t d, bool use_quadr = false, 00077 bool keep_lin_terms = false); 00078 00080 CHashedDenseFeatures(const CHashedDenseFeatures& orig); 00081 00083 virtual CFeatures* duplicate() const; 00084 00086 virtual ~CHashedDenseFeatures(); 00087 00095 virtual int32_t get_dim_feature_space() const; 00096 00106 virtual float64_t dot(int32_t vec_idx1, CDotFeatures* df, 00107 int32_t vec_idx2); 00108 00117 virtual float64_t dense_dot(int32_t vec_idx1, float64_t* vec2, 00118 int32_t vec2_len); 00119 00130 virtual void add_to_dense_vec(float64_t alpha, int32_t vec_idx1, 00131 float64_t* vec2, int32_t vec2_len, bool abs_val = false); 00132 00138 virtual int32_t get_nnz_features_for_vector(int32_t num); 00139 00151 virtual void* get_feature_iterator(int32_t vector_index); 00152 00165 virtual bool get_next_feature(int32_t& index, float64_t& value, 00166 void* iterator); 00167 00173 virtual void free_feature_iterator(void* iterator); 00174 00176 virtual const char* get_name() const; 00177 00182 virtual EFeatureType get_feature_type() const; 00183 00188 virtual EFeatureClass get_feature_class() const; 00189 00194 virtual int32_t get_num_vectors() const; 00195 00201 SGSparseVector<ST> get_hashed_feature_vector(int32_t vec_idx); 00202 00211 static SGSparseVector<ST> hash_vector(SGVector<ST> vec, int32_t dim, bool use_quadratic = false, 00212 bool keep_linear_terms = true); 00213 00214 private: 00215 void init(CDenseFeatures<ST>* feats, int32_t d, bool use_quadr, bool keep_lin_terms); 00216 00217 protected: 00218 00220 CDenseFeatures<ST>* dense_feats; 00221 00223 int32_t dim; 00224 00226 bool use_quadratic; 00227 00229 bool keep_linear_terms; 00230 }; 00231 } 00232 00233 #endif // _HASHED_DENSEFEATURES_H__