VwRegressor.h

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/*
 * Copyright (c) 2009 Yahoo! Inc.  All rights reserved.  The copyrights
 * embodied in the content of this file are licensed under the BSD
 * (revised) open source license.
 *
 * 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
 * Adaptation of Vowpal Wabbit v5.1.
 * Copyright (C) 2011 Berlin Institute of Technology and Max-Planck-Society.
 */

#ifndef _VW_REGRESSOR_H__
#define _VW_REGRESSOR_H__

#include <shogun/base/SGObject.h>
#include <shogun/lib/DataType.h>
#include <shogun/classifier/vw/VwEnvironment.h>
#include <shogun/loss/LossFunction.h>

namespace shogun
{

class CVwRegressor: public CSGObject
{
public:
    CVwRegressor();

    CVwRegressor(CVwEnvironment* env_to_use);

    virtual ~CVwRegressor();

    inline float64_t get_loss(float64_t prediction, float64_t label)
    {
        return loss->loss(prediction, label);
    }

    inline float64_t get_update(float64_t prediction, float64_t label,
                    float64_t eta_t, float64_t norm)
    {
        return loss->get_update(prediction, label, eta_t, norm);
    }

    virtual void dump_regressor(char* reg_name, bool as_text);

    virtual void load_regressor(char* file_name);

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

    virtual void init(CVwEnvironment* env_to_use = NULL);

public:
    float32_t** weight_vectors;
    CLossFunction* loss;

protected:
    CVwEnvironment* env;
};

}
#endif // _VW_REGRESSOR_H__