source: branches/0.4-stable/yat/classifier/FeatureSelector.h @ 1392

Last change on this file since 1392 was 1392, checked in by Peter, 13 years ago

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1#ifndef _theplu_yat_classifier_featureselector_
2#define _theplu_yat_classifier_featureselector_
3
4// $Id$
5
6/*
7  Copyright (C) 2006, 2007 Jari Häkkinen, Peter Johansson
8  Copyright (C) 2008 Peter Johansson
9
10  This file is part of the yat library, http://dev.thep.lu.se/yat
11
12  The yat library is free software; you can redistribute it and/or
13  modify it under the terms of the GNU General Public License as
14  published by the Free Software Foundation; either version 2 of the
15  License, or (at your option) any later version.
16
17  The yat library is distributed in the hope that it will be useful,
18  but WITHOUT ANY WARRANTY; without even the implied warranty of
19  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20  General Public License for more details.
21
22  You should have received a copy of the GNU General Public License
23  along with this program; if not, write to the Free Software
24  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
25  02111-1307, USA.
26*/
27
28#include "yat/utility/Index.h"
29
30#include <list>
31
32namespace theplu {
33namespace yat {
34namespace classifier {
35  class MatrixLookup;
36  class MatrixLookupWeighted;
37  class Target;
38
39  ///
40  /// @brief Interface class for FeatureSelection
41  ///
42  class FeatureSelector
43  {
44  public:
45    ///
46    /// @brief Default Constructor
47    ///
48    FeatureSelector(size_t N, size_t skip=0);
49
50    ///
51    /// Cleaning upp all objects that have beed returned from FeatureSelector.
52    ///
53    /// @brief Destructor
54    ///
55    virtual ~FeatureSelector(void);
56
57    ///
58    /// @return MatrixLookup containing only selected features.
59    ///
60    const MatrixLookup get(const MatrixLookup& data);
61
62    ///
63    /// @return MatrixLookupWeighted containing only selected features.
64    ///
65    const MatrixLookupWeighted get(const MatrixLookupWeighted& data);
66
67    ///
68    /// @return indices corresponding to selected features.
69    ///
70    const utility::Index features(void) const;
71
72    ///
73    /// Uses @a matrix to select features.
74    ///
75    virtual void update(const MatrixLookup& matrix, const Target& target)=0;
76
77    ///
78    /// Uses @a matrix to select features.
79    ///
80    virtual void update(const MatrixLookupWeighted& matrix, 
81                        const Target& target)=0;
82
83  protected:
84    ///
85    /// @brief features
86    ///
87    utility::Index features_;
88
89    ///
90    /// number of features to skip in list
91    ///
92    size_t first_;
93
94    ///
95    /// number of features selected and returned
96    ///
97    size_t N_;
98
99  private:
100
101  };
102
103}}} // of namespace classifier, yat, and theplu
104
105#endif
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