LinearMachine.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) 1999-2009 Soeren Sonnenburg
 * Copyright (C) 1999-2009 Fraunhofer Institute FIRST and Max-Planck-Society
 */

#ifndef _LINEARCLASSIFIER_H__
#define _LINEARCLASSIFIER_H__

#include <shogun/lib/config.h>

#include <shogun/lib/common.h>
#include <shogun/machine/Machine.h>
#include <shogun/lib/SGVector.h>


namespace shogun
{

class CBinaryLabels;
class CDotFeatures;
class CFeatures;
class CRegressionLabels;

class CLinearMachine : public CMachine
{
    public:
        CLinearMachine();

        CLinearMachine(bool compute_bias);

        virtual ~CLinearMachine();

        CLinearMachine(CLinearMachine* machine);

        virtual bool train(CFeatures* data=NULL);

        virtual SGVector<float64_t> get_w() const;

        virtual void set_w(const SGVector<float64_t> src_w);

        virtual void set_bias(float64_t b);

        virtual float64_t get_bias();

        virtual void set_compute_bias(bool compute_bias);

        virtual bool get_compute_bias();        

        virtual void set_features(CDotFeatures* feat);

        virtual CBinaryLabels* apply_binary(CFeatures* data=NULL);

        virtual CRegressionLabels* apply_regression(CFeatures* data=NULL);

        virtual float64_t apply_one(int32_t vec_idx);

        virtual CDotFeatures* get_features();

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

    protected:

        virtual SGVector<float64_t> apply_get_outputs(CFeatures* data);

        virtual void store_model_features();

        void compute_bias(CFeatures* data);

    private:

        void init();

    protected:
        SGVector<float64_t> w;
        float64_t bias;
        CDotFeatures* features;
        bool m_compute_bias;
};
}
#endif