CombinedDotFeatures.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 
00013 #ifndef _COMBINEDDOTFEATURES_H___
00014 #define _COMBINEDDOTFEATURES_H___
00015 
00016 #include <shogun/lib/common.h>
00017 #include <shogun/lib/List.h>
00018 #include <shogun/features/DotFeatures.h>
00019 
00020 namespace shogun
00021 {
00022 class CFeatures;
00023 class CList;
00024 class CListElement;
00044 class CCombinedDotFeatures : public CDotFeatures
00045 {
00046     public:
00048         CCombinedDotFeatures();
00049 
00051         CCombinedDotFeatures(const CCombinedDotFeatures & orig);
00052 
00054         virtual ~CCombinedDotFeatures();
00055 
00060         virtual int32_t get_num_vectors() const
00061         {
00062             return num_vectors;
00063         }
00064 
00069         virtual int32_t get_dim_feature_space() const
00070         {
00071             return  num_dimensions;
00072         }
00073 
00081         virtual float64_t dot(int32_t vec_idx1, CDotFeatures* df, int32_t vec_idx2);
00082 
00089         virtual float64_t dense_dot(int32_t vec_idx1, const float64_t* vec2, int32_t vec2_len);
00090 
00102         virtual void dense_dot_range(float64_t* output, int32_t start,
00103                 int32_t stop, float64_t* alphas, float64_t* vec,
00104                 int32_t dim, float64_t b);
00105 
00117         virtual void dense_dot_range_subset(int32_t* sub_index, int32_t num,
00118                 float64_t* output, float64_t* alphas, float64_t* vec,
00119                 int32_t dim, float64_t b);
00120 
00129         virtual void add_to_dense_vec(float64_t alpha, int32_t vec_idx1,
00130                 float64_t* vec2, int32_t vec2_len, bool abs_val=false);
00131 
00137         virtual int32_t get_nnz_features_for_vector(int32_t num);
00138 
00143         virtual EFeatureType get_feature_type() const
00144         {
00145             return F_DREAL;
00146         }
00147 
00152         virtual EFeatureClass get_feature_class() const
00153         {
00154             return C_COMBINED_DOT;
00155         }
00156 
00161         virtual int32_t get_size() const
00162         {
00163             return sizeof(float64_t);
00164         }
00165 
00166         #ifndef DOXYGEN_SHOULD_SKIP_THIS
00167 
00168         struct combined_feature_iterator
00169         {
00171             CDotFeatures* f;
00173             CListElement* current;
00175             void* iterator;
00177             int32_t vector_index;
00178         };
00179         #endif
00180 
00190         virtual void* get_feature_iterator(int32_t vector_index);
00191 
00202         virtual bool get_next_feature(int32_t& index, float64_t& value, void* iterator);
00203 
00209         virtual void free_feature_iterator(void* iterator);
00210 
00215         virtual CFeatures* duplicate() const;
00216 
00218         void list_feature_objs();
00219 
00224         CDotFeatures* get_first_feature_obj();
00225 
00231         CDotFeatures* get_first_feature_obj(CListElement*& current);
00232 
00237         CDotFeatures* get_next_feature_obj();
00238 
00244         CDotFeatures* get_next_feature_obj(CListElement*& current);
00245 
00250         CDotFeatures* get_last_feature_obj();
00251 
00257         bool insert_feature_obj(CDotFeatures* obj);
00258 
00264         bool append_feature_obj(CDotFeatures* obj);
00265 
00270         bool delete_feature_obj();
00271 
00276         int32_t get_num_feature_obj();
00277 
00281         virtual SGVector<float64_t> get_subfeature_weights();
00282 
00287         virtual void set_subfeature_weights(SGVector<float64_t> weights);
00288 
00290         virtual const char* get_name() const { return "CombinedDotFeatures"; }
00291 
00292     protected:
00294         void update_dim_feature_space_and_num_vec();
00295 
00296     private:
00297         void init();
00298 
00299     protected:
00301         CList* feature_list;
00302 
00304         int32_t num_vectors;
00306         int32_t num_dimensions;
00307 };
00308 }
00309 #endif // _DOTFEATURES_H___
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