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SigmoidKernel.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) 1999-2010 Soeren Sonnenburg
8  * Copyright (C) 1999-2009 Fraunhofer Institute FIRST and Max-Planck-Society
9  * Copyright (C) 2010 Berlin Institute of Technology
10  */
11 
12 #ifndef _SIGMOIDKERNEL_H___
13 #define _SIGMOIDKERNEL_H___
14 
15 #include <shogun/lib/config.h>
16 
17 #include <shogun/lib/common.h>
20 
21 namespace shogun
22 {
32 {
33  public:
36 
44 
53  CSigmoidKernel(CDotFeatures* l, CDotFeatures* r, int32_t size,
54  float64_t gamma, float64_t coef0);
55 
56  virtual ~CSigmoidKernel();
57 
64  virtual bool init(CFeatures* l, CFeatures* r);
65 
67  virtual void cleanup();
68 
73  virtual EKernelType get_kernel_type() { return K_SIGMOID; }
74 
79  virtual const char* get_name() const { return "SigmoidKernel"; }
80 
81  protected:
90  virtual float64_t compute(int32_t idx_a, int32_t idx_b)
91  {
92  return tanh(gamma*CDotKernel::compute(idx_a,idx_b)+coef0);
93  }
94 
95  private:
96  void init();
97 
98  protected:
103 };
104 }
105 #endif /* _SIGMOIDKERNEL_H__ */

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