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

#ifndef _WEIGHTEDCOMMWORDSTRINGKERNEL_H___
#define _WEIGHTEDCOMMWORDSTRINGKERNEL_H___

#include <shogun/lib/common.h>
#include <shogun/mathematics/Math.h>
#include <shogun/kernel/string/CommWordStringKernel.h>

namespace shogun
{
class CCommWordStringKernel;

class CWeightedCommWordStringKernel: public CCommWordStringKernel
{
    public:
        CWeightedCommWordStringKernel();

        CWeightedCommWordStringKernel(int32_t size, bool use_sign);

        CWeightedCommWordStringKernel(
            CStringFeatures<uint16_t>* l, CStringFeatures<uint16_t>* r,
            bool use_sign=false, int32_t size=10);

        virtual ~CWeightedCommWordStringKernel();

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

        virtual void cleanup();

        virtual float64_t compute_optimized(int32_t idx);

        virtual void add_to_normal(int32_t idx, float64_t weight);

        void merge_normal();

        bool set_wd_weights();

        bool set_weights(SGVector<float64_t> weights);

        virtual EKernelType get_kernel_type() { return K_WEIGHTEDCOMMWORDSTRING; }

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

        virtual EFeatureType get_feature_type() { return F_WORD; }

        virtual float64_t* compute_scoring(
            int32_t max_degree, int32_t& num_feat, int32_t& num_sym,
            float64_t* target, int32_t num_suppvec, int32_t* IDX,
            float64_t* alphas, bool do_init=true);

    protected:
        virtual float64_t compute_helper(
            int32_t idx_a, int32_t idx_b, bool do_sort);

    private:
        void init();

    protected:
        int32_t degree;

        float64_t* weights;
};
}
#endif /* _WEIGHTEDCOMMWORDSTRINGKERNEL_H__ */