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 _IMPLICITSPECFEATURES_H___ 00012 #define _IMPLICITSPECFEATURES_H___ 00013 00014 #include "lib/common.h" 00015 #include "lib/io.h" 00016 #include "features/DotFeatures.h" 00017 #include "features/StringFeatures.h" 00018 00019 template <class ST> class CStringFeatures; 00020 00026 class CImplicitWeightedSpecFeatures : public CDotFeatures 00027 { 00028 public: 00029 00035 CImplicitWeightedSpecFeatures(CStringFeatures<uint16_t>* str, bool normalize=true); 00036 00038 CImplicitWeightedSpecFeatures(const CImplicitWeightedSpecFeatures & orig); 00039 00040 virtual ~CImplicitWeightedSpecFeatures(); 00041 00046 virtual CFeatures* duplicate() const; 00047 00055 inline virtual int32_t get_dim_feature_space() 00056 { 00057 return spec_size; 00058 } 00059 00066 virtual float64_t dot(int32_t vec_idx1, int32_t vec_idx2); 00067 00074 virtual float64_t dense_dot(int32_t vec_idx1, const float64_t* vec2, int32_t vec2_len); 00075 00084 virtual void add_to_dense_vec(float64_t alpha, int32_t vec_idx1, float64_t* vec2, int32_t vec2_len, bool abs_val=false); 00085 00091 virtual inline int32_t get_nnz_features_for_vector(int32_t num) 00092 { 00093 SG_NOTIMPLEMENTED; 00094 return 0; 00095 } 00096 00101 inline virtual EFeatureType get_feature_type() 00102 { 00103 return F_UNKNOWN; 00104 } 00105 00110 inline virtual EFeatureClass get_feature_class() 00111 { 00112 return C_WEIGHTEDSPEC; 00113 } 00114 00119 inline virtual int32_t get_num_vectors() 00120 { 00121 return num_strings; 00122 } 00123 00128 inline virtual int32_t get_size() 00129 { 00130 return sizeof(float64_t); 00131 } 00132 00137 bool set_wd_weights(); 00138 00145 bool set_weights(float64_t* w, int32_t d); 00146 00148 inline virtual const char* get_name() const { return "ImplicitWeightedSpecFeatures"; } 00149 00150 protected: 00155 void compute_normalization_const(); 00156 00157 protected: 00159 CStringFeatures<uint16_t>* strings; 00160 00162 float64_t* normalization_factors; 00164 int32_t num_strings; 00166 int32_t alphabet_size; 00167 00169 int32_t degree; 00171 int32_t spec_size; 00172 00174 float64_t* spec_weights; 00175 }; 00176 #endif // _IMPLICITSPECFEATURES_H___