source: trunk/c++_tools/classifier/CrossValidationSampler.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 Revision
File size: 2.0 KB
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1#ifndef _theplu_classifier_crossvalidation_sampler_
2#define _theplu_classifier_crossvalidation_sampler_
3
4// $Id: CrossValidationSampler.h 675 2006-10-10 12:08:45Z jari $
5
6/*
7  Copyright (C) 2006 Peter Johansson
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 "yat/classifier/Sampler.h"
28
29namespace theplu {
30namespace classifier { 
31
32  class Target;
33
34  ///
35  /// Class splitting a set into training set and validation set in a
36  /// crossvalidation manner. This is done in a balanced way, meaning
37  /// the proportions between the classes in the trainingset is close
38  /// to the proportions in the whole dataset. In the first \a k
39  /// rounds each sample is returned k-1 times, for next round the
40  /// samples are shuffled and... In total there are N partitions, in
41  /// other words, each sample is in validation roughly N/k
42  ///   
43  class CrossValidationSampler : public Sampler
44  {
45 
46  public:
47    ///
48    /// @brief Constructor
49    /// 
50    /// @a target targets.   
51    /// @a N total number of partitions.
52    /// @a k for k-fold crossvalidation.
53    ///
54    CrossValidationSampler(const Target& target, const size_t N,const size_t k);
55
56    ///
57    /// Destructor
58    ///
59    virtual ~CrossValidationSampler();
60
61  private:
62    void build(const Target& target, size_t N, size_t k); 
63    const size_t k_;
64
65  };
66
67}} // of namespace classifier and namespace theplu
68
69#endif
70
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