source: trunk/yat/classifier/CrossValidationSampler.h

Last change on this file was 4207, checked in by Peter, 3 months ago

update copyright statements

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1#ifndef _theplu_yat_classifier_crossvalidation_sampler_
2#define _theplu_yat_classifier_crossvalidation_sampler_
3
4// $Id: CrossValidationSampler.h 4207 2022-08-26 04:36:28Z peter $
5
6/*
7  Copyright (C) 2006 Jari Häkkinen, Peter Johansson, Markus Ringnér
8  Copyright (C) 2007, 2008 Jari Häkkinen, Peter Johansson
9  Copyright (C) 2022 Peter Johansson
10
11  This file is part of the yat library, http://dev.thep.lu.se/yat
12
13  The yat library is free software; you can redistribute it and/or
14  modify it under the terms of the GNU General Public License as
15  published by the Free Software Foundation; either version 3 of the
16  License, or (at your option) any later version.
17
18  The yat library is distributed in the hope that it will be useful,
19  but WITHOUT ANY WARRANTY; without even the implied warranty of
20  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
21  General Public License for more details.
22
23  You should have received a copy of the GNU General Public License
24  along with yat. If not, see <http://www.gnu.org/licenses/>.
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 crossvalidation manner.
38  ///
39  /// This is done in a balanced way, meaning
40  /// the proportions between the classes in the trainingset is close
41  /// to the proportions in the whole dataset. In the first \a k
42  /// rounds each sample is returned k-1 times, for next round the
43  /// samples are shuffled and... In total there are N partitions, in
44  /// other words, each sample is in validation roughly N/k
45  ///
46  class CrossValidationSampler : public Sampler
47  {
48
49  public:
50    ///
51    /// @brief Constructor
52    ///
53    /// @a target targets.
54    /// @a N total number of partitions.
55    /// @a k for k-fold crossvalidation.
56    ///
57    CrossValidationSampler(const Target& target, const size_t N,const size_t k);
58
59    ///
60    /// Destructor
61    ///
62    virtual ~CrossValidationSampler();
63
64  private:
65    void build(const Target& target, size_t N, size_t k);
66    const size_t k_;
67
68  };
69
70}}} // of namespace classifier, yat, and theplu
71#endif
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