MulticlassOneVsOneStrategy.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) 2012 Chiyuan Zhang
 * Written (W) 2013 Shell Hu and Heiko Strathmann
 * Copyright (C) 2012 Chiyuan Zhang
 */

#include <shogun/multiclass/MulticlassStrategy.h>

namespace shogun
{

class CMulticlassOneVsOneStrategy: public CMulticlassStrategy
{
public:
    CMulticlassOneVsOneStrategy();

    CMulticlassOneVsOneStrategy(EProbHeuristicType prob_heuris);

    virtual ~CMulticlassOneVsOneStrategy() {}

    virtual void train_start(CMulticlassLabels *orig_labels, CBinaryLabels *train_labels);

    virtual bool train_has_more();

    virtual SGVector<int32_t> train_prepare_next();

    virtual int32_t decide_label(SGVector<float64_t> outputs);

    virtual int32_t get_num_machines()
    {
        return m_num_classes*(m_num_classes-1)/2;
    }

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

    virtual void rescale_outputs(SGVector<float64_t> outputs);

    void set_num_classes(int32_t num_classes)
    {
        CMulticlassStrategy::set_num_classes(num_classes);
        m_num_machines = m_num_classes*(m_num_classes-1)/2;
    }

protected:
    void rescale_heuris_price(SGVector<float64_t> outputs,
        const SGVector<int32_t> indx1, const SGVector<int32_t> indx2);

    void rescale_heuris_hastie(SGVector<float64_t> outputs,
        const SGVector<int32_t> indx1, const SGVector<int32_t> indx2);

    void rescale_heuris_hamamura(SGVector<float64_t> outputs,
        const SGVector<int32_t> indx1, const SGVector<int32_t> indx2);

private:
    void register_parameters();

protected:
    int32_t m_num_machines;     
    int32_t m_train_pair_idx_1; 
    int32_t m_train_pair_idx_2; 
    SGVector<int32_t> m_num_samples; 
};

} // namespace shogun