MultitaskKernelMklNormalizer.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) 2010 Christian Widmer
 * Copyright (C) 2010 Max-Planck-Society
 */

#ifndef _MULTITASKKERNELMKLNORMALIZER_H___
#define _MULTITASKKERNELMKLNORMALIZER_H___

#include <shogun/transfer/multitask/MultitaskKernelMklNormalizer.h>
#include <shogun/kernel/Kernel.h>
#include <algorithm>
#include <string>

namespace shogun
{


class CMultitaskKernelMklNormalizer: public CKernelNormalizer
{

public:

    CMultitaskKernelMklNormalizer() : CKernelNormalizer(), scale(1.0)
    {
        m_type = N_MULTITASK;
    }


    virtual bool init(CKernel* k)
    {

        //same as first-element normalizer
        CFeatures* old_lhs=k->lhs;
        CFeatures* old_rhs=k->rhs;
        k->lhs=old_lhs;
        k->rhs=old_lhs;

        if (std::string(k->get_name()) == "WeightedDegree") {
            SG_INFO("using first-element normalization\n");
            scale=k->compute(0, 0);
        } else {
            SG_INFO("no inner normalization for non-WDK kernel\n");
            scale=1.0;
        }


        k->lhs=old_lhs;
        k->rhs=old_rhs;

        ASSERT(k);
        int32_t num_lhs = k->get_num_vec_lhs();
        int32_t num_rhs = k->get_num_vec_rhs();
        ASSERT(num_lhs>0);
        ASSERT(num_rhs>0);


        return true;
    }



    inline virtual float64_t normalize_lhs(float64_t value, int32_t idx_lhs)
    {
        SG_ERROR("normalize_lhs not implemented");
        return 0;
    }

    inline virtual float64_t normalize_rhs(float64_t value, int32_t idx_rhs)
    {
        SG_ERROR("normalize_rhs not implemented");
        return 0;
    }

public:


    virtual float64_t get_beta(int32_t idx) = 0;

    virtual void set_beta(int32_t idx, float64_t weight) = 0;


    virtual int32_t get_num_betas() = 0;


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

protected:


    float64_t scale;

};
}
#endif