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 Soeren Sonnenburg
00008  * Copyright (C) 2009 Fraunhofer Institute FIRST and Max-Planck-Society
00009  */
00010 
00011 #ifndef _DOTFEATURES_H___
00012 #define _DOTFEATURES_H___
00013 
00014 #include "lib/common.h"
00015 #include "features/Features.h"
00016 
00036 class CDotFeatures : public CFeatures
00037 {
00038     public:
00039 
00044         CDotFeatures(int32_t size=0) : CFeatures(size), combined_weight(1.0)
00045         {
00046             set_property(FP_DOT);
00047         }
00048 
00050         CDotFeatures(const CDotFeatures & orig) :
00051             CFeatures(orig), combined_weight(orig.combined_weight)  {}
00052 
00057         CDotFeatures(char* fname) : CFeatures(fname) {}
00058 
00059         virtual ~CDotFeatures() { }
00060 
00068         virtual int32_t get_dim_feature_space()=0;
00069 
00076         virtual float64_t dot(int32_t vec_idx1, int32_t vec_idx2)=0;
00077 
00084         virtual float64_t dense_dot(int32_t vec_idx1, const float64_t* vec2, int32_t vec2_len)=0;
00085 
00094         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;
00095 
00107         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);
00108 
00109 
00112         static void* dense_dot_range_helper(void* p);
00113 
00121         virtual int32_t get_nnz_features_for_vector(int32_t num)=0;
00122 
00127         inline float64_t get_combined_feature_weight() { return combined_weight; }
00128 
00133         inline void set_combined_feature_weight(float64_t nw) { combined_weight=nw; }
00134 
00142         virtual void get_feature_matrix(float64_t** dst, int32_t* num_feat, int32_t* num_vec);
00143 
00144     protected:
00151         inline void display_progress(int32_t start, int32_t stop, int32_t v)
00152         {
00153             int32_t num_vectors=stop-start;
00154             int32_t i=v-start;
00155 
00156             if ( (i% (num_vectors/100+1))== 0)
00157                 SG_PROGRESS(v, 0.0, num_vectors-1);
00158         }
00159     protected:
00160 
00162         float64_t combined_weight;
00163 };
00164 #endif // _DOTFEATURES_H___

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