source: trunk/yat/classifier/CrossValidationSampler.h @ 767

Last change on this file since 767 was 767, checked in by Peter, 15 years ago

Fixes #65

  • 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_yat_classifier_crossvalidation_sampler_
2#define _theplu_yat_classifier_crossvalidation_sampler_
3
4// $Id: CrossValidationSampler.h 767 2007-02-22 15:14:40Z peter $
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 "Sampler.h"
28
29namespace theplu {
30namespace yat {
31namespace classifier { 
32
33  class Target;
34
35  ///
36  /// @brief Class splitting a set into training set and validation
37  /// set in a
38  /// crossvalidation manner. This is done in a balanced way, meaning
39  /// the proportions between the classes in the trainingset is close
40  /// to the proportions in the whole dataset. In the first \a k
41  /// rounds each sample is returned k-1 times, for next round the
42  /// samples are shuffled and... In total there are N partitions, in
43  /// other words, each sample is in validation roughly N/k
44  ///   
45  class CrossValidationSampler : public Sampler
46  {
47 
48  public:
49    ///
50    /// @brief Constructor
51    /// 
52    /// @a target targets.   
53    /// @a N total number of partitions.
54    /// @a k for k-fold crossvalidation.
55    ///
56    CrossValidationSampler(const Target& target, const size_t N,const size_t k);
57
58    ///
59    /// Destructor
60    ///
61    virtual ~CrossValidationSampler();
62
63  private:
64    void build(const Target& target, size_t N, size_t k); 
65    const size_t k_;
66
67  };
68
69}}} // of namespace classifier, yat, and theplu
70
71#endif
72
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