Kernel.h

#ifndef _theplu_yat_classifier_kernel_
#define _theplu_yat_classifier_kernel_

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

/*
  Copyright (C) 2005 Jari Häkkinen, Peter Johansson
  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
  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 <cstddef>
#include <vector>

namespace theplu {
namespace yat {
namespace classifier {

  class MatrixLookup;
  class MatrixLookupWeighted;

  class Kernel
  {

  public:

    Kernel(const MatrixLookup& data, const KernelFunction& kf,
           const bool own=false);

    Kernel(const MatrixLookupWeighted& data, const KernelFunction& kf,
           const bool own=false);

    Kernel(const Kernel& kernel, const std::vector<size_t>& index);

    virtual ~Kernel(void);

    virtual double operator()(const size_t row, const size_t column) const=0;

    const MatrixLookup& data(void) const;

    const MatrixLookupWeighted& data_weighted(void) const;

    double element(const DataLookup1D& vec, const size_t i) const;

    double element(const DataLookupWeighted1D& vec, const size_t i) const;

    virtual const Kernel* make_kernel(const MatrixLookup&, const bool) const=0;


    virtual const Kernel* make_kernel(const MatrixLookupWeighted&,
                                      const bool own=false) const=0;


    size_t size(void) const;

    bool weighted(void) const;

  protected:
    const MatrixLookup* ml_;
    const MatrixLookupWeighted* mlw_;
    const KernelFunction* kf_;

    unsigned int* ref_count_;

    unsigned int* ref_count_w_;

  private:
    Kernel(const Kernel&);

    const Kernel& operator=(const Kernel&);

  }; // class Kernel

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

#endif