NBC.h

#ifndef _theplu_yat_classifier_nbc_ 
#define _theplu_yat_classifier_nbc_ 

// $Id: NBC.h 2119 2009-12-12 23:11:43Z peter $

/*
  Copyright (C) 2006 Jari Häkkinen, Peter Johansson, Markus Ringnér
  Copyright (C) 2007 Jari Häkkinen, Peter Johansson
  Copyright (C) 2008 Jari Häkkinen, Peter Johansson, 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 3 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 yat. If not, see <http://www.gnu.org/licenses/>.
*/

#include "SupervisedClassifier.h"
#include "yat/utility/Matrix.h"

namespace theplu {
namespace yat {
namespace classifier {  

  class MatrixLookup;
  class MatrixLookupWeighted;
  class Target;

  class NBC : public SupervisedClassifier
  {
  
  public:
    NBC(void);
    

    virtual ~NBC();


    NBC* make_classifier(void) const;
    
    void train(const MatrixLookup&, const Target&);

    void train(const MatrixLookupWeighted&, const Target&);
    
    void predict(const MatrixLookup& data, utility::Matrix& result) const;

    void predict(const MatrixLookupWeighted& data,utility::Matrix& result) const;


  private:
    void standardize_lnP(utility::Matrix& prediction) const;

    utility::Matrix centroids_;
    utility::Matrix sigma2_;

    double sum_logsigma(size_t i) const;


  };
  
}}} // of namespace classifier, yat, and theplu

#endif