DistantSegmentsKernel.h

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/*
 * This program 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.
 *
 * Written (W) 2011 Heiko Strathmann
 * DS-Kernel implementation Written (W) 2008 Sébastien Boisvert under GPLv3
 * Copyright (C) 2011 Berlin Institute of Technology and Max-Planck-Society
 */

#ifndef DISTANTSEGMENTSKERNEL_H_
#define DISTANTSEGMENTSKERNEL_H_

#include <shogun/kernel/string/StringKernel.h>

namespace shogun
{

class CDistantSegmentsKernel: public CStringKernel<char>
{
public:
    CDistantSegmentsKernel();

    CDistantSegmentsKernel(int32_t size, int32_t delta, int32_t theta);

    CDistantSegmentsKernel(CStringFeatures<char>* l, CStringFeatures<char>* r,
            int32_t size, int32_t delta, int32_t theta);

    virtual bool init(CFeatures* l, CFeatures* r);

    virtual EKernelType get_kernel_type()
    {
        return K_DISTANTSEGMENTS;
    }

    virtual const char* get_name() const
    {
        return "DistantSegmentsKernel";
    }

protected:
    virtual float64_t compute(int32_t idx_a, int32_t idx_b);

private:
    void init();

    int32_t bin(int32_t j, int32_t i);

    int32_t compute(char* s, int32_t sLength, char* b, int32_t bLength,
            int32_t delta_m, int32_t theta_m);

protected:
    int32_t m_delta;

    int32_t m_theta;


};

}

#endif /* DISTANTSEGMENTSKERNEL_H_ */