SHOGUN
v2.0.0
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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) 2009-2010 Soeren Sonnenburg 00008 * Copyright (C) 2009 Fraunhofer Institute FIRST and Max-Planck-Society 00009 * Copyright (C) 2010 Berlin Institute of Technology 00010 */ 00011 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, 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 inline virtual int32_t get_num_vectors() const; 00170 00171 inline 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 inline 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___