MulticlassModel.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) 2013 Thoralf Klein
 * Written (W) 2012 Fernando José Iglesias García
 * Copyright (C) 2012 Fernando José Iglesias García
 */

#ifndef _MULTICLASS_MODEL__H__
#define _MULTICLASS_MODEL__H__

#include <shogun/lib/config.h>

#include <shogun/structure/StructuredModel.h>

namespace shogun
{

class CMulticlassModel : public CStructuredModel
{

    public:
        CMulticlassModel();

        CMulticlassModel(CFeatures* features, CStructuredLabels* labels);

        virtual ~CMulticlassModel();

        virtual CStructuredLabels* structured_labels_factory(int32_t num_labels=0);

        virtual int32_t get_dim() const;

        virtual SGVector< float64_t > get_joint_feature_vector(int32_t feat_idx, CStructuredData* y);

        virtual CResultSet* argmax(SGVector< float64_t > w, int32_t feat_idx, bool const training = true);

        virtual float64_t delta_loss(CStructuredData* y1, CStructuredData* y2);

        virtual void init_primal_opt(
                float64_t regularization,
                SGMatrix< float64_t > & A,  SGVector< float64_t > a,
                SGMatrix< float64_t > B,  SGVector< float64_t > & b,
                SGVector< float64_t > & lb, SGVector< float64_t > & ub,
                SGMatrix < float64_t > & C);

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

    private:
        void init();

        float64_t delta_loss(float64_t y1, float64_t y2);
        float64_t delta_loss(int32_t y1_idx, float64_t y2);

    private:
        int32_t m_num_classes;

}; /* MulticlassModel */

} /* namespace shogun */

#endif /* _MULTICLASS_MODEL__H__ */