LinearStringKernel.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) 1999-2009 Soeren Sonnenburg
 * Copyright (C) 1999-2009 Fraunhofer Institute FIRST and Max-Planck-Society
 */

#ifndef _LINEARSTRINGKERNEL_H___
#define _LINEARSTRINGKERNEL_H___

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

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

        CLinearStringKernel(CStringFeatures<char>* l, CStringFeatures<char>* r);

        virtual ~CLinearStringKernel();

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

        virtual void cleanup();

        virtual EKernelType get_kernel_type()
        {
            return K_LINEAR;
        }

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

        virtual bool init_optimization(
            int32_t num_suppvec, int32_t* sv_idx, float64_t* alphas);

        virtual bool delete_optimization();

        virtual float64_t compute_optimized(int32_t idx);

        virtual void clear_normal();

        virtual void add_to_normal(int32_t idx, float64_t weight);

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

    protected:
        float64_t* normal;
};
}
#endif /* _LINEARSTRINGKERNEL_H___ */