LocalityImprovedStringKernel.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) 1999-2008 Gunnar Raetsch
 * Written (W) 1999-2008 Soeren Sonnenburg
 * Copyright (C) 1999-2009 Fraunhofer Institute FIRST and Max-Planck-Society
 */

#ifndef _LOCALITYIMPROVEDSTRINGKERNEL_H___
#define _LOCALITYIMPROVEDSTRINGKERNEL_H___

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

namespace shogun
{
class CLocalityImprovedStringKernel: public CStringKernel<char>
{
    public:
        CLocalityImprovedStringKernel();

        CLocalityImprovedStringKernel(int32_t size, int32_t length,
            int32_t inner_degree, int32_t outer_degree);

        CLocalityImprovedStringKernel(
            CStringFeatures<char>* l, CStringFeatures<char>* r,
            int32_t length, int32_t inner_degree, int32_t outer_degree);

        virtual ~CLocalityImprovedStringKernel();

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

        virtual EKernelType get_kernel_type() { return K_LOCALITYIMPROVED; }

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

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

    private:
        void init();

    protected:
        int32_t length;
        int32_t inner_degree;
        int32_t outer_degree;
};
}
#endif /* _LOCALITYIMPROVEDSTRINGKERNEL_H__ */