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/common.h>
#include <shogun/features/Labels.h>
#include <shogun/features/DotFeatures.h>
#include <shogun/machine/Machine.h>

#include <stdio.h>

namespace shogun
{
    class CDotFeatures;
    class CMachine;
    class CLabels;

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

        inline void get_w(float64_t*& dst_w, int32_t& dst_dims)
        {
            ASSERT(w && w_dim>0);
            dst_w=w;
            dst_dims=w_dim;
        }

        inline SGVector<float64_t> get_w()
        {
            return SGVector<float64_t>(w, w_dim, false);
        }

        inline void set_w(SGVector<float64_t> src_w)
        {
            SG_FREE(w);
            w=src_w.vector;
            w_dim=src_w.vlen;
        }

        inline void set_bias(float64_t b)
        {
            bias=b;
        }

        inline float64_t get_bias()
        {
            return bias;
        }

        virtual bool load(FILE* srcfile);

        virtual bool save(FILE* dstfile);

        virtual inline void set_features(CDotFeatures* feat)
        {
            SG_UNREF(features);
            SG_REF(feat);
            features=feat;
        }

        virtual CLabels* apply();

        virtual CLabels* apply(CFeatures* data);

        virtual float64_t apply(int32_t vec_idx)
        {
            return features->dense_dot(vec_idx, w, w_dim) + bias;
        }

        virtual CDotFeatures* get_features() { SG_REF(features); return features; }

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

    protected:
        virtual void store_model_features() {}

    protected:
        int32_t w_dim;
        float64_t* w;
        float64_t bias;
        CDotFeatures* features;
};
}
#endif