GaussianKernelFunction.h

#ifndef _theplu_yat_classifier_gaussian_kernel_function_
#define _theplu_yat_classifier_gaussian_kernel_function_

// $Id: GaussianKernelFunction.h 4207 2022-08-26 04:36:28Z peter $

/*
  Copyright (C) 2004, 2005, 2006, 2007, 2008 Jari Häkkinen, Peter Johansson
  Copyright (C) 2022 Peter Johansson

  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 "KernelFunction.h"

#include <cmath>

namespace theplu {
namespace yat {
namespace classifier {

  class DataLookup1D;


  class GaussianKernelFunction : public KernelFunction
  {

  public:
    GaussianKernelFunction(double = 1);

       virtual ~GaussianKernelFunction(void) {};

    double operator()(const DataLookup1D& x,
                      const DataLookup1D& y) const;

    double operator()(const DataLookup1D& x,
                      const DataLookupWeighted1D& y) const;

    double operator()(const DataLookupWeighted1D& x,
                      const DataLookupWeighted1D& y) const;

  private:
    double sigma2_;

  }; // class GaussianKernelFunction

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

#endif