op_kmeans_proto.hpp

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// Copyright (C) 2011 the authors listed below
// http://ecocpak.sourceforge.net
// 
// Authors:
// - Dimitrios Bouzas (bouzas at ieee dot org)
// - Nikolaos Arvanitopoulos (niarvani at ieee dot org)
// - Anastasios Tefas (tefas at aiia dot csd dot auth dot gr)
// 
// This file is part of the ECOC PAK C++ library. It is 
// provided without any warranty of fitness for any purpose.
//
// You can redistribute this file and/or modify it under 
// the terms of the GNU Lesser General Public License (LGPL) 
// as published by the Free Software Foundation, either 
// version 3 of the License or (at your option) any later 
// version.
// (see http://www.opensource.org/licenses for more info)





class op_kmeans
  {
  public:
  
  // main functions

  template<typename eT> inline static void direct_kmeans
    (      
                                                                 Col<u32>& indices_out, 
                                                                 Col<u32>& ranks,
                                                                  Mat<eT>& centroids_out,
                                                            const Mat<eT>& in,
                                                            const u32      k,                                                         
                                                            const eT       lr
    );                                                           
  
  
  // auxuliary functions
  
  template<typename  eT> inline static void compute_distance
    (
                                                                           Row<eT>& dist_out, 
                                                                               u32& winner, 
                                                             const         Mat<eT>& centroids_in, 
                                                             const subview_row<eT>& sample_in
    );
    
  template<typename eT> inline static eT  compute_distance
    (
                                                            const subview_row<eT>& sample_in, 
                                                            const subview_row<eT>& centroid_in 
    );

  template<typename eT> inline static void init_centroids
    (
                                                                  Mat<eT>& centroids_out, 
                                                            const Mat<eT>& samples_in, 
                                                            const u32      k
    );

  };