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Chi2Kernel.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) 1999-2009 Soeren Sonnenburg
8  * Copyright (C) 1999-2009 Fraunhofer Institute FIRST and Max-Planck-Society
9  */
10 
11 #ifndef _CHI2KERNEL_H___
12 #define _CHI2KERNEL_H___
13 
14 #include <shogun/lib/config.h>
15 
16 #include <shogun/lib/common.h>
20 
21 namespace shogun
22 {
34 class CChi2Kernel: public CDotKernel
35 {
36  void init();
37 
38  public:
40  CChi2Kernel();
41 
47  CChi2Kernel(int32_t size, float64_t width);
48 
57  float64_t width, int32_t size=10);
58 
59  virtual ~CChi2Kernel();
60 
67  virtual bool init(CFeatures* l, CFeatures* r);
68 
70  virtual float64_t get_width();
71 
77 
82  virtual EKernelType get_kernel_type() { return K_CHI2; }
83 
88  virtual EFeatureClass get_feature_class() { return C_DENSE; }
89 
94  virtual EFeatureType get_feature_type() { return F_DREAL; }
95 
100  virtual const char* get_name() const { return "Chi2Kernel"; }
101 
102  protected:
111  virtual float64_t compute(int32_t idx_a, int32_t idx_b);
112 
113  protected:
116 };
117 }
118 #endif /* _CHI2KERNEL_H__ */

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