SHOGUN  v3.2.0
WDFeatures.h
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1 /*
2  * This program is free software; you can redistribute it and/or modify
3  * it under the terms of the GNU General Public License as published by
4  * the Free Software Foundation; either version 3 of the License, or
5  * (at your option) any later version.
6  *
7  * Written (W) 2009-2010 Soeren Sonnenburg
8  * Copyright (C) 2009 Fraunhofer Institute FIRST and Max-Planck-Society
9  * Copyright (C) 2010 Berlin Institute of Technology
10  */
11 
12 #ifndef _WDFEATURES_H___
13 #define _WDFEATURES_H___
14 
15 #include <shogun/lib/common.h>
18 
19 namespace shogun
20 {
21 template <class ST> class CStringFeatures;
22 
28 class CWDFeatures : public CDotFeatures
29 {
30  public:
32  CWDFeatures();
33 
40  CWDFeatures(CStringFeatures<uint8_t>* str, int32_t order, int32_t from_order);
41 
43  CWDFeatures(const CWDFeatures & orig);
44 
46  virtual ~CWDFeatures();
47 
55  virtual int32_t get_dim_feature_space() const;
56 
64  virtual float64_t dot(int32_t vec_idx1, CDotFeatures* df, int32_t vec_idx2);
65 
72  virtual float64_t dense_dot(int32_t vec_idx1, const float64_t* vec2, int32_t vec2_len);
73 
82  virtual void add_to_dense_vec(float64_t alpha, int32_t vec_idx1,
83  float64_t* vec2, int32_t vec2_len, bool abs_val=false);
84 
90  virtual int32_t get_nnz_features_for_vector(int32_t num);
91 
92  #ifndef DOXYGEN_SHOULD_SKIP_THIS
93 
94  struct wd_feature_iterator
95  {
97  uint8_t* vec;
99  int32_t vidx;
101  int32_t vlen;
103  bool vfree;
104 
109  int32_t lim;
110  int32_t* val;
111  int32_t asize;
112  int32_t asizem1;
113  int32_t offs;
114  int32_t k;
115  int32_t i;
116  int32_t o;
118  };
119  #endif
120 
130  virtual void* get_feature_iterator(int32_t vector_index);
131 
142  virtual bool get_next_feature(int32_t& index, float64_t& value, void* iterator);
143 
149  virtual void free_feature_iterator(void* iterator);
150 
155  virtual CFeatures* duplicate() const;
156 
161  virtual EFeatureType get_feature_type() const;
162 
167  virtual EFeatureClass get_feature_class() const;
168 
169  virtual int32_t get_num_vectors() const;
170 
174 
177 
179  virtual const char* get_name() const { return "WDFeatures"; }
180 
185  void set_wd_weights(SGVector<float64_t> weights);
186 
188  void set_wd_weights();
189 
190  protected:
193 
195  int32_t degree;
197  int32_t from_degree;
199  int32_t string_length;
201  int32_t num_strings;
203  int32_t alphabet_size;
205  int32_t w_dim;
208 
211 
212 };
213 }
214 #endif // _WDFEATURES_H___
virtual EFeatureClass get_feature_class() const
Definition: WDFeatures.cpp:327
float64_t get_normalization_const()
Definition: WDFeatures.cpp:337
virtual float64_t dense_dot(int32_t vec_idx1, const float64_t *vec2, int32_t vec2_len)
Definition: WDFeatures.cpp:119
virtual void add_to_dense_vec(float64_t alpha, int32_t vec_idx1, float64_t *vec2, int32_t vec2_len, bool abs_val=false)
Definition: WDFeatures.cpp:157
Features that compute the Weighted Degreee Kernel feature space explicitly.
Definition: WDFeatures.h:28
Features that support dot products among other operations.
Definition: DotFeatures.h:41
virtual float64_t dot(int32_t vec_idx1, CDotFeatures *df, int32_t vec_idx2)
Definition: WDFeatures.cpp:88
EFeatureClass
shogun feature class
Definition: FeatureTypes.h:35
float64_t * wd_weights
Definition: WDFeatures.h:207
virtual int32_t get_dim_feature_space() const
Definition: WDFeatures.cpp:308
void set_normalization_const(float64_t n=0)
Definition: WDFeatures.cpp:212
double float64_t
Definition: common.h:48
virtual const char * get_name() const
Definition: WDFeatures.h:179
virtual bool get_next_feature(int32_t &index, float64_t &value, void *iterator)
Definition: WDFeatures.cpp:256
float64_t normalization_const
Definition: WDFeatures.h:210
EFeatureType
shogun feature type
Definition: FeatureTypes.h:16
all of classes and functions are contained in the shogun namespace
Definition: class_list.h:16
The class Features is the base class of all feature objects.
Definition: Features.h:62
virtual int32_t get_nnz_features_for_vector(int32_t num)
Definition: WDFeatures.cpp:313
virtual void * get_feature_iterator(int32_t vector_index)
Definition: WDFeatures.cpp:228
CStringFeatures< uint8_t > * strings
Definition: WDFeatures.h:192
virtual CFeatures * duplicate() const
Definition: WDFeatures.cpp:303
virtual int32_t get_num_vectors() const
Definition: WDFeatures.cpp:332
virtual EFeatureType get_feature_type() const
Definition: WDFeatures.cpp:322
virtual void free_feature_iterator(void *iterator)
Definition: WDFeatures.cpp:294
virtual ~CWDFeatures()
Definition: WDFeatures.cpp:82

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