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 Soeren Sonnenburg 00008 * Copyright (C) 2009 Fraunhofer Institute FIRST and Max-Planck-Society 00009 */ 00010 00011 #ifndef _WDFEATURES_H___ 00012 #define _WDFEATURES_H___ 00013 00014 #include "lib/common.h" 00015 #include "features/DotFeatures.h" 00016 #include "features/StringFeatures.h" 00017 00018 namespace shogun 00019 { 00020 template <class ST> class CStringFeatures; 00021 00027 class CWDFeatures : public CDotFeatures 00028 { 00029 public: 00030 00037 CWDFeatures(CStringFeatures<uint8_t>* str, int32_t order, int32_t from_order); 00038 00040 CWDFeatures(const CWDFeatures & orig); 00041 00043 virtual ~CWDFeatures(); 00044 00052 inline virtual int32_t get_dim_feature_space() 00053 { 00054 return w_dim; 00055 } 00056 00063 virtual float64_t dot(int32_t vec_idx1, int32_t vec_idx2); 00064 00071 virtual float64_t dense_dot(int32_t vec_idx1, const float64_t* vec2, int32_t vec2_len); 00072 00081 virtual void add_to_dense_vec(float64_t alpha, int32_t vec_idx1, float64_t* vec2, int32_t vec2_len, bool abs_val=false); 00082 00088 virtual inline int32_t get_nnz_features_for_vector(int32_t num) 00089 { 00090 return w_dim/alphabet_size; 00091 } 00092 00097 virtual CFeatures* duplicate() const; 00098 00103 inline virtual EFeatureType get_feature_type() 00104 { 00105 return F_UNKNOWN; 00106 } 00107 00112 inline virtual EFeatureClass get_feature_class() 00113 { 00114 return C_WD; 00115 } 00116 00117 inline virtual int32_t get_num_vectors() 00118 { 00119 return num_strings; 00120 } 00121 00122 inline virtual int32_t get_size() 00123 { 00124 return sizeof(float64_t); 00125 } 00126 00128 inline virtual const char* get_name() const { return "WDFeatures"; } 00129 00130 protected: 00132 void set_normalization_const(); 00133 00135 void set_wd_weights(); 00136 00137 protected: 00139 CStringFeatures<uint8_t>* strings; 00140 00142 float64_t normalization_const; 00143 00145 int32_t degree; 00147 int32_t from_degree; 00149 int32_t string_length; 00151 int32_t num_strings; 00153 int32_t alphabet_size; 00155 int32_t w_dim; 00157 float64_t* wd_weights; 00158 }; 00159 } 00160 #endif // _WDFEATURES_H___