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00010 #ifndef _SPARSEPOLYFEATURES__H__
00011 #define _SPARSEPOLYFEATURES__H__
00012
00013 #include "lib/common.h"
00014 #include "features/DotFeatures.h"
00015 #include "features/SparseFeatures.h"
00016
00017 namespace shogun
00018 {
00024 class CSparsePolyFeatures : public CDotFeatures
00025 {
00026 public:
00028 CSparsePolyFeatures(void);
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 SG_PRINT("CSparsePolyFeatures:\n");
00050 SG_NOTIMPLEMENTED;};
00051
00056 inline virtual int32_t get_dim_feature_space()
00057 {
00058 return m_output_dimensions;
00059 }
00060
00066 virtual inline int32_t get_nnz_features_for_vector(int32_t num)
00067 {
00068 int32_t vlen;
00069 bool do_free;
00070 TSparseEntry<float64_t>* vec = m_feat->get_sparse_feature_vector(num, vlen, do_free);
00071 m_feat->free_feature_vector(vec, vlen, do_free);
00072 return vlen*(vlen+1)/2;
00073 }
00074
00079 inline virtual EFeatureType get_feature_type()
00080 {
00081 return F_UNKNOWN;
00082 }
00083
00088 inline virtual EFeatureClass get_feature_class()
00089 {
00090 return C_POLY;
00091 }
00092
00097 inline virtual int32_t get_num_vectors()
00098 {
00099 if (m_feat)
00100 return m_feat->get_num_vectors();
00101 else
00102 return 0;
00103
00104 }
00105
00113 virtual float64_t dot(int32_t vec_idx1, CDotFeatures* df, int32_t vec_idx2);
00114
00119 inline virtual int32_t get_size()
00120 {
00121 return sizeof(float64_t);
00122 }
00123
00125 struct sparse_poly_feature_iterator
00126 {
00128 uint16_t* vec;
00130 int32_t vidx;
00132 int32_t vlen;
00134 bool vfree;
00135
00137 int32_t index;
00138
00139 };
00140
00150 virtual void* get_feature_iterator(int32_t vector_index)
00151 {
00152 SG_NOTIMPLEMENTED;
00153 return NULL;
00154 }
00155
00166 virtual bool get_next_feature(int32_t& index, float64_t& value, void* iterator)
00167 {
00168 SG_NOTIMPLEMENTED;
00169 return NULL;
00170 }
00171
00177 virtual void free_feature_iterator(void* iterator)
00178 {
00179 SG_NOTIMPLEMENTED;
00180 }
00181
00186 CFeatures* duplicate() const;
00187
00192 inline virtual const char* get_name() const { return "SparsePolyFeatures"; }
00193
00201 virtual float64_t dense_dot(int32_t vec_idx1, const float64_t* vec2, int32_t vec2_len);
00202
00211 virtual void add_to_dense_vec(float64_t alpha, int32_t vec_idx1, float64_t* vec2, int32_t vec2_len, bool abs_val=false);
00212
00213 protected:
00215 void store_normalization_values();
00216
00217 protected:
00219 CSparseFeatures<float64_t>* m_feat;
00221 int32_t m_degree;
00223 bool m_normalize;
00225 int32_t m_input_dimensions;
00227 int32_t m_output_dimensions;
00229 float64_t* m_normalization_values;
00231 uint32_t mask;
00233 int32_t m_hash_bits;
00234 };
00235 }
00236 #endif // _SPARSEPOLYFEATURES__H__