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ImplicitWeightedSpecFeatures.h
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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 _IMPLICITSPECFEATURES_H___
00013 #define _IMPLICITSPECFEATURES_H___
00014 
00015 #include <shogun/lib/common.h>
00016 #include <shogun/io/SGIO.h>
00017 #include <shogun/features/DotFeatures.h>
00018 #include <shogun/features/StringFeatures.h>
00019 
00020 namespace shogun
00021 {
00022 
00023 template <class ST> class CStringFeatures;
00024 
00030 class CImplicitWeightedSpecFeatures : public CDotFeatures
00031 {
00032     public:
00034         CImplicitWeightedSpecFeatures();
00035 
00041         CImplicitWeightedSpecFeatures(CStringFeatures<uint16_t>* str, bool normalize=true);
00042 
00044         CImplicitWeightedSpecFeatures(const CImplicitWeightedSpecFeatures & orig);
00045 
00046         virtual ~CImplicitWeightedSpecFeatures();
00047 
00052         virtual CFeatures* duplicate() const;
00053 
00061         virtual int32_t get_dim_feature_space() const;
00062 
00070         virtual float64_t dot(int32_t vec_idx1, CDotFeatures* df, int32_t vec_idx2);
00071 
00078         virtual float64_t dense_dot(int32_t vec_idx1, float64_t* vec2, int32_t vec2_len);
00079 
00088         virtual void add_to_dense_vec(float64_t alpha, int32_t vec_idx1,
00089                 float64_t* vec2, int32_t vec2_len, bool abs_val=false);
00090 
00096         virtual int32_t get_nnz_features_for_vector(int32_t num);
00097 
00102         virtual EFeatureType get_feature_type() const;
00103 
00108         virtual EFeatureClass get_feature_class() const;
00109 
00114         virtual int32_t get_num_vectors() const;
00115 
00120         bool set_wd_weights();
00121 
00128         bool set_weights(float64_t* w, int32_t d);
00129 
00130         #ifndef DOXYGEN_SHOULD_SKIP_THIS
00131 
00132         struct wspec_feature_iterator
00133         {
00135             uint16_t* vec;
00137             int32_t vidx;
00139             int32_t vlen;
00141             bool vfree;
00142 
00147             int32_t offs;
00148             int32_t d;
00149             int32_t j;
00150             uint8_t mask;
00151             float64_t alpha;
00153         };
00154         #endif
00155 
00165         virtual void* get_feature_iterator(int32_t vector_index);
00166 
00177         virtual bool get_next_feature(int32_t& index, float64_t& value, void* iterator);
00178 
00184         virtual void free_feature_iterator(void* iterator);
00185 
00187         virtual const char* get_name() const { return "ImplicitWeightedSpecFeatures"; }
00188 
00189     protected:
00194         void compute_normalization_const();
00195 
00196     protected:
00198         CStringFeatures<uint16_t>* strings;
00199 
00201         float64_t* normalization_factors;
00203         int32_t num_strings;
00205         int32_t alphabet_size;
00206 
00208         int32_t degree;
00210         int32_t spec_size;
00211 
00213         float64_t* spec_weights;
00214 };
00215 }
00216 #endif // _IMPLICITSPECFEATURES_H___
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