source: trunk/yat/classifier/KernelFunction.h @ 831

Last change on this file since 831 was 831, checked in by Peter, 15 years ago

Refs #185.

  • Property svn:eol-style set to native
  • Property svn:keywords set to Author Date ID
File size: 2.3 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 Jari Häkkinen, Peter Johansson
11  Copyright (C) 2007 Peter Johansson
12
13  This file is part of the yat library, http://lev.thep.lu.se/trac/yat
14
15  The yat library is free software; you can redistribute it and/or
16  modify it under the terms of the GNU General Public License as
17  published by the Free Software Foundation; either version 2 of the
18  License, or (at your option) any later version.
19
20  The yat library is distributed in the hope that it will be useful,
21  but WITHOUT ANY WARRANTY; without even the implied warranty of
22  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23  General Public License for more details.
24
25  You should have received a copy of the GNU General Public License
26  along with this program; if not, write to the Free Software
27  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
28  02111-1307, USA.
29*/
30
31namespace theplu {
32namespace yat {
33namespace classifier {
34  class DataLookup1D;
35  class DataLookupWeighted1D;
36
37  ///
38  /// @brief Interface class calculating elements in Kernel.
39  ///
40  class KernelFunction
41  {
42   
43  public:
44    ///
45    /// Constructor
46    ///   
47    KernelFunction(void) {};
48
49    ///
50    /// Destructor
51    ///
52    virtual ~KernelFunction(void) {};
53   
54    ///
55    /// @return scalar product of two vector in feature space.
56    ///
57    virtual double operator()(const DataLookup1D&,
58                              const DataLookup1D&) const = 0; 
59   
60    ///
61    /// @return scalar product of two vector in feature space.
62    ///
63    virtual double operator()(const DataLookup1D&,
64                              const DataLookupWeighted1D&) const = 0; 
65   
66    ///
67    /// @return scalar product of two vector in feature space.
68    ///
69    inline double operator()(const DataLookupWeighted1D& vec_w,
70                             const DataLookup1D& vec) const 
71    { return this->operator()(vec,vec_w); } 
72   
73    ///
74    /// @return scalar product of two vector in feature space.
75    ///
76    virtual double operator()(const DataLookupWeighted1D&,
77                              const DataLookupWeighted1D&) const = 0; 
78   
79  }; // class KernelFunction
80
81}}} // of namespace classifier, yat, and theplu
82
83#endif
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