DotFeatures.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 _DOTFEATURES_H___
00013 #define _DOTFEATURES_H___
00014 
00015 #include <shogun/lib/common.h>
00016 #include <shogun/lib/Time.h>
00017 #include <shogun/mathematics/Math.h>
00018 #include <shogun/features/Features.h>
00019 
00020 namespace shogun
00021 {
00043 class CDotFeatures : public CFeatures
00044 {
00045     void init(void);
00046 
00047     public:
00048 
00053         CDotFeatures(int32_t size=0);
00054 
00056         CDotFeatures(const CDotFeatures & orig);
00057 
00062         CDotFeatures(CFile* loader);
00063 
00064         virtual ~CDotFeatures() { }
00065 
00073         virtual int32_t get_dim_feature_space() const=0;
00074 
00082         virtual float64_t dot(int32_t vec_idx1, CDotFeatures* df, int32_t vec_idx2)=0;
00083 
00090         virtual float64_t dense_dot(int32_t vec_idx1, const float64_t* vec2, int32_t vec2_len)=0;
00091 
00100         virtual void add_to_dense_vec(float64_t alpha, int32_t vec_idx1, float64_t* vec2, int32_t vec2_len, bool abs_val=false)=0;
00101 
00115         virtual void dense_dot_range(float64_t* output, int32_t start, int32_t stop, float64_t* alphas, float64_t* vec, int32_t dim, float64_t b);
00116 
00128         virtual void dense_dot_range_subset(int32_t* sub_index, int32_t num, float64_t* output, float64_t* alphas, float64_t* vec, int32_t dim, float64_t b);
00129 
00132         static void* dense_dot_range_helper(void* p);
00133 
00141         virtual int32_t get_nnz_features_for_vector(int32_t num)=0;
00142 
00147         inline float64_t get_combined_feature_weight() { return combined_weight; }
00148 
00153         inline void set_combined_feature_weight(float64_t nw) { combined_weight=nw; }
00154 
00159         SGMatrix<float64_t> get_computed_dot_feature_matrix();
00160 
00165         SGVector<float64_t> get_computed_dot_feature_vector(int32_t num);
00166 
00168         void benchmark_add_to_dense_vector(int32_t repeats=5);
00169 
00171         void benchmark_dense_dot_range(int32_t repeats=5);
00172 
00182         virtual void* get_feature_iterator(int32_t vector_index)=0;
00183 
00194         virtual bool get_next_feature(int32_t& index, float64_t& value, void* iterator)=0;
00195 
00201         virtual void free_feature_iterator(void* iterator)=0;
00202 
00207         virtual SGVector<float64_t> get_mean();
00208 
00213         virtual SGMatrix<float64_t> get_cov();
00214 
00215     protected:
00222         inline void display_progress(int32_t start, int32_t stop, int32_t v)
00223         {
00224             int32_t num_vectors=stop-start;
00225             int32_t i=v-start;
00226 
00227             if ( (i% (num_vectors/100+1))== 0)
00228                 SG_PROGRESS(v, 0.0, num_vectors-1);
00229         }
00230 
00231     protected:
00232 
00234         float64_t combined_weight;
00235 };
00236 }
00237 #endif // _DOTFEATURES_H___
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