MulticlassOneVsRestStrategy.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
 */

#ifndef MULTICLASSONEVSRESTSTRATEGY_H__
#define MULTICLASSONEVSRESTSTRATEGY_H__

#include <shogun/lib/config.h>

#include <shogun/multiclass/MulticlassStrategy.h>

namespace shogun
{

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

    CMulticlassOneVsRestStrategy(EProbHeuristicType prob_heuris);

    virtual ~CMulticlassOneVsRestStrategy() {}

    virtual void train_start(CMulticlassLabels *orig_labels, CBinaryLabels *train_labels)
    {
        CMulticlassStrategy::train_start(orig_labels, train_labels);
    }

    virtual bool train_has_more()
    {
        return m_train_iter < m_num_classes;
    }

    virtual SGVector<int32_t> train_prepare_next();

    virtual int32_t decide_label(SGVector<float64_t> outputs);

    virtual SGVector<index_t> decide_label_multiple_output(SGVector<float64_t> outputs, int32_t n_outputs);

    virtual int32_t get_num_machines()
    {
        return m_num_classes;
    }

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

    virtual void rescale_outputs(SGVector<float64_t> outputs);

    virtual void rescale_outputs(SGVector<float64_t> outputs,
            const SGVector<float64_t> As, const SGVector<float64_t> Bs);

protected:
    void rescale_heuris_norm(SGVector<float64_t> outputs);

    void rescale_heuris_softmax(SGVector<float64_t> outputs,
            const SGVector<float64_t> As, const SGVector<float64_t> Bs);

};

} // namespace shogun

#endif /* end of include guard: MULTICLASSONEVSRESTSTRATEGY_H__ */