source: branches/0.4-stable/yat/classifier/KNN_ReciprocalDistance.h @ 1392

#ifndef theplu_yat_classifier_knn_reciprocal_distance_h
#define theplu_yat_classifier_knn_reciprocal_distance_h

// $Id: KNN_ReciprocalDistance.h 1392 2008-07-28 19:35:30Z peter $

/*
  Copyright (C) 2008 Markus Ringnér

  This file is part of the yat library, http://dev.thep.lu.se/yat

  The yat library is free software; you can redistribute it and/or
  modify it under the terms of the GNU General Public License as
  published by the Free Software Foundation; either version 2 of the
  License, or (at your option) any later version.

  The yat library is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  02111-1307, USA.
*/


#include <vector>

namespace theplu {
namespace yat {
  
  namespace utility {
    class VectorBase;
    class VectorMutable;
  }

namespace classifier {

  class Target;
  
  ///
  /// @brief A model of the concept \ref concept_neighbor_weighting to
  /// be used with KNN to weight the votes of the k nearest neighbors
  /// of a sample. 
  ///
  /// KNN_ReciprocalDistance weights the vote of a nearest neighbor with
  /// its reciprocal rank. 
  struct KNN_ReciprocalDistance
  {   
    /**
       The total vote for each class is calculated and returned in prediction.
    */
    void operator()(const utility::VectorBase& dist,
                    const std::vector<size_t> k_sorted,
                    const Target& target, 
                    utility::VectorMutable& prediction) const;    
  };

}}} // of namespace classifier, yat, and theplu
    
#endif