source: trunk/yat/classifier/FeatureSelector.h @ 676

Last change on this file since 676 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: 2.5 KB
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1#ifndef _theplu_classifier_featureselector_
2#define _theplu_classifier_featureselector_
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
27#include <list>
28#include <vector>
29
30namespace theplu {
31namespace classifier {
32  class MatrixLookup;
33  class MatrixLookupWeighted;
34  class Target;
35
36  ///
37  /// @brief Interface class for FeatureSelection
38  ///
39  class FeatureSelector
40  {
41  public:
42    ///
43    /// @brief Default Constructor
44    ///
45    FeatureSelector(size_t N, size_t skip=0);
46
47    ///
48    /// Cleaning upp all objects that have beed returned from FeatureSelector.
49    ///
50    /// @brief Destructor
51    ///
52    virtual ~FeatureSelector(void);
53
54    ///
55    /// @return MatrixLookup containing only selected features.
56    ///
57    const MatrixLookup& get(const MatrixLookup& data);
58
59    ///
60    /// @return MatrixLookupWeighted containing only selected features.
61    ///
62    const MatrixLookupWeighted& get(const MatrixLookupWeighted& data);
63
64    ///
65    /// @return vector of indices corresponding to selected features.
66    ///
67    inline const std::vector<size_t> features(void) const { return features_; }
68
69    ///
70    /// Uses @a matrix to select features.
71    ///
72    virtual void update(const MatrixLookup& matrix, const Target& target)=0;
73
74    ///
75    /// Uses @a matrix to select features.
76    ///
77    virtual void update(const MatrixLookupWeighted& matrix, 
78                        const Target& target)=0;
79
80  protected:
81    ///
82    /// @brief features
83    ///
84    std::vector<size_t> features_;
85
86    ///
87    /// number of features to skip in list
88    ///
89    size_t first_;
90
91    ///
92    /// number of features selected and returned
93    ///
94    size_t N_;
95
96  private:
97    std::list<const MatrixLookup*> garbage_;
98    std::list<const MatrixLookupWeighted*> garbage_weighted_;
99
100  };
101
102} // end of namespace classifier
103} // end of namespace theplu
104
105#endif
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