source: trunk/yat/classifier/KernelFunction.h @ 1275

Last change on this file since 1275 was 1275, checked in by Jari Häkkinen, 13 years ago

Updating copyright statements.

  • Property svn:eol-style set to native
  • Property svn:keywords set to Author Date ID
File size: 2.2 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) 2003 Peter Johansson
8  Copyright (C) 2004 Jari Häkkinen, Peter Johansson
9  Copyright (C) 2005 Peter Johansson
10  Copyright (C) 2006, 2007 Jari Häkkinen, Peter Johansson
11
12  This file is part of the yat library, http://trac.thep.lu.se/yat
13
14  The yat library is free software; you can redistribute it and/or
15  modify it under the terms of the GNU General Public License as
16  published by the Free Software Foundation; either version 2 of the
17  License, or (at your option) any later version.
18
19  The yat library is distributed in the hope that it will be useful,
20  but WITHOUT ANY WARRANTY; without even the implied warranty of
21  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
22  General Public License for more details.
23
24  You should have received a copy of the GNU General Public License
25  along with this program; if not, write to the Free Software
26  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
27  02111-1307, USA.
28*/
29
30namespace theplu {
31namespace yat {
32namespace classifier {
33  class DataLookup1D;
34  class DataLookupWeighted1D;
35
36  ///
37  /// @brief Interface class calculating elements in Kernel.
38  ///
39  class KernelFunction
40  {
41   
42  public:
43    ///
44    /// Constructor
45    ///   
46    KernelFunction(void) {};
47
48    ///
49    /// Destructor
50    ///
51    virtual ~KernelFunction(void) {};
52   
53    ///
54    /// @return scalar product of two vector in feature space.
55    ///
56    virtual double operator()(const DataLookup1D&,
57                              const DataLookup1D&) const = 0; 
58   
59    ///
60    /// @return scalar product of two vector in feature space.
61    ///
62    virtual double operator()(const DataLookup1D&,
63                              const DataLookupWeighted1D&) const = 0; 
64   
65    ///
66    /// @return scalar product of two vector in feature space.
67    ///
68    inline double operator()(const DataLookupWeighted1D& vec_w,
69                             const DataLookup1D& vec) const 
70    { return this->operator()(vec,vec_w); } 
71   
72    ///
73    /// @return scalar product of two vector in feature space.
74    ///
75    virtual double operator()(const DataLookupWeighted1D&,
76                              const DataLookupWeighted1D&) const = 0; 
77   
78  }; // class KernelFunction
79
80}}} // of namespace classifier, yat, and theplu
81
82#endif
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