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SparsePolyFeatures.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) 2010 Soeren Sonnenburg
00008  * Copyright (C) 2010 Berlin Institute of Technology
00009  */
00010 #ifndef _SPARSEPOLYFEATURES__H__
00011 #define _SPARSEPOLYFEATURES__H__
00012 
00013 #include <shogun/lib/common.h>
00014 #include <shogun/features/DotFeatures.h>
00015 #include <shogun/features/SparseFeatures.h>
00016 
00017 namespace shogun
00018 {
00024 class CSparsePolyFeatures : public CDotFeatures
00025 {
00026     public:
00028         CSparsePolyFeatures();
00029 
00038         CSparsePolyFeatures(CSparseFeatures<float64_t>* feat, int32_t degree, bool normalize, int32_t hash_bits);
00039 
00040         virtual ~CSparsePolyFeatures();
00041 
00048         CSparsePolyFeatures(const CSparsePolyFeatures & orig);
00049 
00054         virtual int32_t get_dim_feature_space() const;
00055 
00061         virtual int32_t get_nnz_features_for_vector(int32_t num);
00062 
00067         virtual EFeatureType get_feature_type() const;
00068 
00073         virtual EFeatureClass get_feature_class() const;
00074 
00079         virtual int32_t get_num_vectors() const;
00080 
00088         virtual float64_t dot(int32_t vec_idx1, CDotFeatures* df, int32_t vec_idx2);
00089 
00090         #ifndef DOXYGEN_SHOULD_SKIP_THIS
00091 
00092         struct sparse_poly_feature_iterator
00093         {
00095             uint16_t* vec;
00097             int32_t vidx;
00099             int32_t vlen;
00101             bool vfree;
00102 
00104             int32_t index;
00105         };
00106         #endif
00107 
00117         virtual void* get_feature_iterator(int32_t vector_index);
00118 
00129         bool get_next_feature(int32_t& index, float64_t& value, void* iterator);
00130 
00136         void free_feature_iterator(void* iterator);
00137 
00142         CFeatures* duplicate() const;
00143 
00148         virtual const char* get_name() const { return "SparsePolyFeatures"; }
00149 
00157         virtual float64_t dense_dot(int32_t vec_idx1, float64_t* vec2, int32_t vec2_len);
00158 
00167         virtual void add_to_dense_vec(float64_t alpha, int32_t vec_idx1, float64_t* vec2, int32_t vec2_len, bool abs_val=false);
00168 
00169     protected:
00171         void store_normalization_values();
00172 
00173     protected:
00175         CSparseFeatures<float64_t>* m_feat;
00177         int32_t m_degree;
00179         bool m_normalize;
00181         int32_t m_input_dimensions;
00183         int32_t m_output_dimensions;
00185         float64_t* m_normalization_values;
00187         uint32_t mask;
00189         int32_t m_hash_bits;
00190     private:
00192         void init();
00193 
00194     private:
00196         int32_t m_normalization_values_len;
00197 };
00198 }
00199 #endif // _SPARSEPOLYFEATURES__H__
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