source: trunk/yat/classifier/KernelFunction.h @ 680

Last change on this file since 680 was 680, checked in by Jari Häkkinen, 15 years ago

Addresses #153. Introduced yat namespace. Removed alignment namespace. Clean up of code.

  • Property svn:eol-style set to native
  • Property svn:keywords set to Author Date ID
File size: 2.1 KB
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1#ifndef _theplu_yat_classifier_kernel_function_
2#define _theplu_yat_classifier_kernel_function_
3
4// $Id$
5
6/*
7  Copyright (C) The authors contributing to this file.
8
9  This file is part of the yat library, http://lev.thep.lu.se/trac/yat
10
11  The yat library is free software; you can redistribute it and/or
12  modify it under the terms of the GNU General Public License as
13  published by the Free Software Foundation; either version 2 of the
14  License, or (at your option) any later version.
15
16  The yat library is distributed in the hope that it will be useful,
17  but WITHOUT ANY WARRANTY; without even the implied warranty of
18  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19  General Public License for more details.
20
21  You should have received a copy of the GNU General Public License
22  along with this program; if not, write to the Free Software
23  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
24  02111-1307, USA.
25*/
26
27namespace theplu {
28namespace yat {
29namespace classifier {
30  class DataLookup1D;
31  class DataLookupWeighted1D;
32
33  ///
34  ///   Virtual Class calculating kernel matrix.
35  ///
36  class KernelFunction
37  {
38   
39  public:
40    ///
41    /// Constructor
42    ///   
43    KernelFunction(void) {};
44
45    ///
46    /// Destructor
47    ///
48    virtual ~KernelFunction(void) {};
49   
50    ///
51    /// @return scalar product of two vector in feature space.
52    ///
53    virtual double operator()(const DataLookup1D&,
54                              const DataLookup1D&) const = 0; 
55   
56    ///
57    /// @return scalar product of two vector in feature space.
58    ///
59    virtual double operator()(const DataLookup1D&,
60                              const DataLookupWeighted1D&) const = 0; 
61   
62    ///
63    /// @return scalar product of two vector in feature space.
64    ///
65    inline double operator()(const DataLookupWeighted1D& vec_w,
66                             const DataLookup1D& vec) const 
67    { return this->operator()(vec,vec_w); } 
68   
69    ///
70    /// @return scalar product of two vector in feature space.
71    ///
72    virtual double operator()(const DataLookupWeighted1D&,
73                              const DataLookupWeighted1D&) const = 0; 
74   
75  }; // class KernelFunction
76
77}}} // of namespace classifier, yat, and theplu
78
79#endif
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