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DiagKernel.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 _DIAGKERNEL_H___
12 #define _DIAGKERNEL_H___
13 
14 #include <shogun/lib/config.h>
15 
16 #include <shogun/lib/common.h>
17 #include <shogun/kernel/Kernel.h>
18 
19 namespace shogun
20 {
28 class CDiagKernel: public CKernel
29 {
30  public:
32  CDiagKernel();
33 
39  CDiagKernel(int32_t size, float64_t diag=1.0);
40 
48 
49  virtual ~CDiagKernel();
50 
57  virtual bool init(CFeatures* l, CFeatures* r);
58 
64  {
65  return F_ANY;
66  }
67 
73  {
74  return C_ANY;
75  }
76 
81  virtual EKernelType get_kernel_type() { return K_DIAG; }
82 
87  virtual const char* get_name() const { return "DiagKernel"; }
88 
89  protected:
98  virtual float64_t compute(int32_t idx_a, int32_t idx_b)
99  {
100  if (idx_a==idx_b)
101  return diag;
102  else
103  return 0;
104  }
105  private:
106  void init();
107 
108  protected:
111 };
112 }
113 #endif /* _DIAGKERNEL_H__ */

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