source: trunk/c++_tools/classifier/KernelFunction.h @ 675

Last change on this file since 675 was 675, checked in by Jari Häkkinen, 15 years ago

References #83. Changing project name to yat. Compilation will fail in this revision.

  • 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_classifier_kernel_function_
2#define _theplu_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 classifier {
29  class DataLookup1D;
30  class DataLookupWeighted1D;
31
32  ///
33  ///   Virtual Class calculating kernel matrix.
34  ///
35  class KernelFunction
36  {
37   
38  public:
39    ///
40    /// Constructor
41    ///   
42    KernelFunction(void) {};
43
44    ///
45    /// Destructor
46    ///
47    virtual ~KernelFunction(void) {};
48   
49    ///
50    /// @return scalar product of two vector in feature space.
51    ///
52    virtual double operator()(const DataLookup1D&,
53                              const DataLookup1D&) const = 0; 
54   
55    ///
56    /// @return scalar product of two vector in feature space.
57    ///
58    virtual double operator()(const DataLookup1D&,
59                              const DataLookupWeighted1D&) const = 0; 
60   
61    ///
62    /// @return scalar product of two vector in feature space.
63    ///
64    inline double operator()(const DataLookupWeighted1D& vec_w,
65                             const DataLookup1D& vec) const 
66    { return this->operator()(vec,vec_w); } 
67   
68    ///
69    /// @return scalar product of two vector in feature space.
70    ///
71    virtual double operator()(const DataLookupWeighted1D&,
72                              const DataLookupWeighted1D&) const = 0; 
73   
74  }; // class KernelFunction
75
76}} // of namespace classifier and namespace theplu
77
78#endif
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