source: trunk/yat/classifier/CrossValidationSampler.h @ 1615

Last change on this file since 1615 was 1487, checked in by Jari Häkkinen, 13 years ago

Addresses #436. GPL license copy reference should also be updated.

  • 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 1487 2008-09-10 08:41:36Z jari $
5
6/*
7  Copyright (C) 2006 Jari Häkkinen, Peter Johansson, Markus Ringnér
8  Copyright (C) 2007 Jari Häkkinen, 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 3 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 yat. If not, see <http://www.gnu.org/licenses/>.
24*/
25
26#include "Sampler.h"
27
28namespace theplu {
29namespace yat {
30namespace classifier {
31
32  class Target;
33
34  ///
35  /// @brief Class splitting a set into training set and validation
36  /// set in a crossvalidation manner.
37  ///
38  /// 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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