# source:branches/0.4-stable/yat/classifier/KNN_ReciprocalRank.h@1743

Last change on this file since 1743 was 1743, checked in by Peter, 12 years ago

• Property svn:eol-style set to native
• Property svn:keywords set to Id
File size: 1.8 KB
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1#ifndef theplu_yat_classifier_knn_reciprocal_rank_h
2#define theplu_yat_classifier_knn_reciprocal_rank_h
3
4// $Id: KNN_ReciprocalRank.h 1743 2009-01-23 14:20:30Z peter$
5
6/*
7  Copyright (C) 2008 Peter Johansson, Markus Ringnér
8
9  This file is part of the yat library, http://dev.thep.lu.se/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
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
28#include <vector>
29
30namespace theplu {
31namespace yat {
32
33  namespace utility {
34    class VectorBase;
35    class VectorMutable;
36  }
37
38namespace classifier {
39
40  class Target;
41
42
43  ///
44  /// @brief A model of the concept \ref concept_neighbor_weighting to
45  /// be used with KNN to weight the votes of the k nearest neighbors
46  /// of a sample.
47  ///
48  /// KNN_ReciprocalRank weights the vote of a nearest neighbor with
49  /// its reciprocal rank. The class of the nearest neighbor gets
50  /// the vote 1/1, the class of the second nearest neighbor gets the
51  /// vote 1/2, and so on
52  ///
53  struct KNN_ReciprocalRank
54  {
55    /**
56       The total vote for each class is calculated and returned in prediction.
57    */
58    void operator()(const utility::VectorBase& distance,
59                    const std::vector<size_t> k_sorted,
60                    const Target& target,
61                    utility::VectorMutable& prediction) const;
62  };
63
64}}} // of namespace classifier, yat, and theplu
65
66#endif
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