SubsequenceStringKernel.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) 2014 Soumyajit De
 */

#ifndef SUBSEQUENCE_STRING_KERNEL_H_
#define SUBSEQUENCE_STRING_KERNEL_H_

#include <shogun/lib/config.h>

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

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

    CSubsequenceStringKernel(int32_t size, int32_t maxlen, float64_t lambda);

    CSubsequenceStringKernel(CStringFeatures<char>* lhs, CStringFeatures<char>* rhs,
        int32_t maxlen, float64_t lambda);

    virtual ~CSubsequenceStringKernel();

    virtual bool init(CFeatures* lhs, CFeatures* rhs);

    virtual void cleanup();

    virtual EKernelType get_kernel_type()
    {
        return K_POLYMATCH;
    }

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

    virtual void register_params();

    virtual float64_t compute(int32_t idx_a, int32_t idx_b);

protected:
    int32_t m_maxlen;

    float64_t m_lambda;
};

}
#endif // SUBSEQUENCE_STRING_KERNEL_H_