SquaredHingeLoss.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) 2011 Shashwat Lal Das
 * Written (W) 2012 Fernando José Iglesias García
 * Copyright (c) 2011 Berlin Institute of Technology and Max-Planck-Society.
 */

#ifndef _SQUAREDHINGELOSS_H__
#define _SQUAREDHINGELOSS_H__

#include <shogun/lib/config.h>

#include <shogun/loss/LossFunction.h>

namespace shogun
{
class CSquaredHingeLoss: public CLossFunction
{
public:
    CSquaredHingeLoss(): CLossFunction() {};

    ~CSquaredHingeLoss() {};

    float64_t loss(float64_t z);

    float64_t first_derivative(float64_t z);

    float64_t second_derivative(float64_t z);

    virtual float64_t get_update(float64_t prediction, float64_t label, float64_t eta_t, float64_t norm);

    virtual float64_t get_square_grad(float64_t prediction, float64_t label);

    virtual ELossType get_loss_type() { return L_SQUAREDHINGELOSS; }

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

}

#endif // _SQUAREDHINGELOSS_H__