WDFeatures.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 _WDFEATURES_H___
00013 #define _WDFEATURES_H___
00014 
00015 #include "lib/common.h"
00016 #include "features/DotFeatures.h"
00017 #include "features/StringFeatures.h"
00018 
00019 namespace shogun
00020 {
00021 template <class ST> class CStringFeatures;
00022 
00028 class CWDFeatures : public CDotFeatures
00029 {
00030     public:
00031 
00038         CWDFeatures(CStringFeatures<uint8_t>* str, int32_t order, int32_t from_order);
00039 
00041         CWDFeatures(const CWDFeatures & orig);
00042 
00044         virtual ~CWDFeatures();
00045 
00053         inline virtual int32_t get_dim_feature_space()
00054         {
00055             return w_dim;
00056         }
00057 
00064         virtual float64_t dot(int32_t vec_idx1, int32_t vec_idx2);
00065 
00072         virtual float64_t dense_dot(int32_t vec_idx1, const float64_t* vec2, int32_t vec2_len);
00073 
00082         virtual void add_to_dense_vec(float64_t alpha, int32_t vec_idx1, float64_t* vec2, int32_t vec2_len, bool abs_val=false);
00083 
00089         virtual inline int32_t get_nnz_features_for_vector(int32_t num)
00090         {
00091             int32_t vlen=-1;
00092             bool free_vec;
00093             uint8_t* vec=strings->get_feature_vector(num, vlen, free_vec);
00094             strings->free_feature_vector(vec, num, free_vec);
00095             return degree*vlen;
00096         }
00097 
00099         struct wd_feature_iterator
00100         {
00102             uint8_t* vec;
00104             int32_t vidx;
00106             int32_t vlen;
00108             bool vfree;
00109 
00114             int32_t lim;
00115             int32_t* val;
00116             int32_t asize;
00117             int32_t asizem1;
00118             int32_t offs;
00119             int32_t k;
00120             int32_t i;
00121             int32_t o;
00123         };
00124 
00134         virtual void* get_feature_iterator(int32_t vector_index);
00135 
00146         virtual bool get_next_feature(int32_t& index, float64_t& value, void* iterator);
00147 
00153         virtual void free_feature_iterator(void* iterator);
00154 
00159         virtual CFeatures* duplicate() const;
00160 
00165         inline virtual EFeatureType get_feature_type()
00166         {
00167             return F_UNKNOWN;
00168         }
00169 
00174         inline virtual EFeatureClass get_feature_class()
00175         {
00176             return C_WD;
00177         }
00178 
00179         inline virtual int32_t get_num_vectors()
00180         {
00181             return num_strings;
00182         }
00183 
00184         inline virtual int32_t get_size()
00185         {
00186             return sizeof(float64_t);
00187         }
00188 
00191         void set_normalization_const(float64_t n=0);
00192 
00194         inline float64_t get_normalization_const()
00195         {
00196             return normalization_const;
00197         }
00198 
00200         inline virtual const char* get_name() const { return "WDFeatures"; }
00201 
00208         void set_wd_weights(float64_t* weights, int32_t d)
00209         {
00210             ASSERT(d==degree);
00211 
00212             for (int32_t i=0; i<degree; i++)
00213                 wd_weights[i]=weights[i];
00214         }
00215 
00217         void set_wd_weights();
00218 
00219     protected:
00221         CStringFeatures<uint8_t>* strings;
00222 
00224         int32_t degree;
00226         int32_t from_degree;
00228         int32_t string_length;
00230         int32_t num_strings;
00232         int32_t alphabet_size;
00234         int32_t w_dim;
00236         float64_t* wd_weights;
00237 
00239         float64_t normalization_const;
00240 
00241 };
00242 }
00243 #endif // _WDFEATURES_H___
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