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ID3ClassifierTree.h
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1 /*
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3  * Written (w) 2014 Parijat Mazumdar
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30 
31 
32 #ifndef _ID3CLASSIFIERTREE_H__
33 #define _ID3CLASSIFIERTREE_H__
34 
35 #include <shogun/lib/config.h>
36 
41 
42 namespace shogun
43 {
44 
74 class CID3ClassifierTree : public CTreeMachine<id3TreeNodeData>
75 {
76 public:
79 
81  virtual ~CID3ClassifierTree();
82 
86  virtual const char* get_name() const { return "ID3ClassifierTree"; }
87 
91  virtual CMulticlassLabels* apply_multiclass(CFeatures* data=NULL);
92 
113  bool prune_tree(CDenseFeatures<float64_t>* validation_data, CMulticlassLabels* validation_labels, float64_t epsilon=0.f);
114 
115 protected:
116 
120  virtual bool train_machine(CFeatures* data=NULL);
121 
122 private:
123 
132  node_t* id3train(CFeatures* data, CMulticlassLabels* class_labels, SGVector<int32_t> values, int level = 0);
133 
141  float64_t informational_gain_attribute(int32_t attr_no, CFeatures* data, CMulticlassLabels* class_labels);
142 
148  float64_t entropy(CMulticlassLabels* labels);
149 
157  void prune_tree_machine(CDenseFeatures<float64_t>* feats, CMulticlassLabels* gnd_truth, node_t* current, float64_t epsilon);
158 
165  CMulticlassLabels* apply_multiclass_from_current_node(CDenseFeatures<float64_t>* feats, node_t* current);
166 };
167 } /* namespace shogun */
168 
169 #endif /* _ID3CLASSIFIERTREE_H__ */

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