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/features/Features.h>
00017 
00018 namespace shogun
00019 {
00041 class CDotFeatures : public CFeatures
00042 {
00043     public:
00044 
00049         CDotFeatures(int32_t size=0);
00050 
00052         CDotFeatures(const CDotFeatures & orig);
00053 
00058         CDotFeatures(CFile* loader);
00059 
00060         virtual ~CDotFeatures() { }
00061 
00069         virtual int32_t get_dim_feature_space() const=0;
00070 
00078         virtual float64_t dot(int32_t vec_idx1, CDotFeatures* df, int32_t vec_idx2)=0;
00079 
00085         virtual float64_t dense_dot_sgvec(int32_t vec_idx1, const SGVector<float64_t> vec2);
00086 
00093         virtual float64_t dense_dot(int32_t vec_idx1, const float64_t* vec2, int32_t vec2_len)=0;
00094 
00103         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;
00104 
00118         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);
00119 
00131         virtual void dense_dot_range_subset(int32_t* sub_index, int32_t num,
00132                 float64_t* output, float64_t* alphas, float64_t* vec, int32_t dim, float64_t b);
00133 
00136         static void* dense_dot_range_helper(void* p);
00137 
00145         virtual int32_t get_nnz_features_for_vector(int32_t num)=0;
00146 
00151         inline float64_t get_combined_feature_weight() { return combined_weight; }
00152 
00157         inline void set_combined_feature_weight(float64_t nw) { combined_weight=nw; }
00158 
00163         SGMatrix<float64_t> get_computed_dot_feature_matrix();
00164 
00169         SGVector<float64_t> get_computed_dot_feature_vector(int32_t num);
00170 
00172         void benchmark_add_to_dense_vector(int32_t repeats=5);
00173 
00175         void benchmark_dense_dot_range(int32_t repeats=5);
00176 
00186         virtual void* get_feature_iterator(int32_t vector_index)=0;
00187 
00198         virtual bool get_next_feature(int32_t& index, float64_t& value, void* iterator)=0;
00199 
00205         virtual void free_feature_iterator(void* iterator)=0;
00206 
00211         virtual SGVector<float64_t> get_mean();
00212 
00217         static SGVector<float64_t> get_mean(CDotFeatures* lhs, CDotFeatures* rhs);
00218 
00223         virtual SGMatrix<float64_t> get_cov();
00224 
00229         static SGMatrix<float64_t> compute_cov(CDotFeatures* lhs, CDotFeatures* rhs);
00230 
00231     protected:
00238         void display_progress(int32_t start, int32_t stop, int32_t v);
00239 
00240     private:
00241         void init();
00242 
00243     protected:
00244 
00246         float64_t combined_weight;
00247 };
00248 }
00249 #endif // _DOTFEATURES_H___
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