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 namespace shogun 00020 { 00021 00022 template <class ST> class CStringFeatures; 00023 00029 class CImplicitWeightedSpecFeatures : public CDotFeatures 00030 { 00031 public: 00032 00038 CImplicitWeightedSpecFeatures(CStringFeatures<uint16_t>* str, bool normalize=true); 00039 00041 CImplicitWeightedSpecFeatures(const CImplicitWeightedSpecFeatures & orig); 00042 00043 virtual ~CImplicitWeightedSpecFeatures(); 00044 00049 virtual CFeatures* duplicate() const; 00050 00058 inline virtual int32_t get_dim_feature_space() 00059 { 00060 return spec_size; 00061 } 00062 00069 virtual float64_t dot(int32_t vec_idx1, int32_t vec_idx2); 00070 00077 virtual float64_t dense_dot(int32_t vec_idx1, const float64_t* vec2, int32_t vec2_len); 00078 00087 virtual void add_to_dense_vec(float64_t alpha, int32_t vec_idx1, float64_t* vec2, int32_t vec2_len, bool abs_val=false); 00088 00094 virtual inline int32_t get_nnz_features_for_vector(int32_t num) 00095 { 00096 SG_NOTIMPLEMENTED; 00097 return 0; 00098 } 00099 00104 inline virtual EFeatureType get_feature_type() 00105 { 00106 return F_UNKNOWN; 00107 } 00108 00113 inline virtual EFeatureClass get_feature_class() 00114 { 00115 return C_WEIGHTEDSPEC; 00116 } 00117 00122 inline virtual int32_t get_num_vectors() 00123 { 00124 return num_strings; 00125 } 00126 00131 inline virtual int32_t get_size() 00132 { 00133 return sizeof(float64_t); 00134 } 00135 00140 bool set_wd_weights(); 00141 00148 bool set_weights(float64_t* w, int32_t d); 00149 00151 inline virtual const char* get_name() const { return "ImplicitWeightedSpecFeatures"; } 00152 00153 protected: 00158 void compute_normalization_const(); 00159 00160 protected: 00162 CStringFeatures<uint16_t>* strings; 00163 00165 float64_t* normalization_factors; 00167 int32_t num_strings; 00169 int32_t alphabet_size; 00170 00172 int32_t degree; 00174 int32_t spec_size; 00175 00177 float64_t* spec_weights; 00178 }; 00179 } 00180 #endif // _IMPLICITSPECFEATURES_H___