MahalanobisDistance.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) 2012 Fernando José Iglesias García
 * Copyright (C) 2012 Fernando José Iglesias García
 */

#ifndef _MAHALANOBISDISTANCE_H__
#define _MAHALANOBISDISTANCE_H__

#ifdef HAVE_LAPACK

#include <shogun/lib/common.h>
#include <shogun/distance/RealDistance.h>

namespace shogun
{
class CMahalanobisDistance: public CRealDistance
{
    public:
        CMahalanobisDistance();

        CMahalanobisDistance(CDenseFeatures<float64_t>* l, CDenseFeatures<float64_t>* r);
        virtual ~CMahalanobisDistance();

        virtual bool init(CFeatures* l, CFeatures* r);

        virtual void cleanup();

        virtual EDistanceType get_distance_type() { return D_MAHALANOBIS; }

        inline virtual EFeatureType get_feature_type() { return F_DREAL; }

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

        virtual bool get_disable_sqrt() { return disable_sqrt; };

        virtual void set_disable_sqrt(bool state) { disable_sqrt=state; };

        virtual bool get_use_mean() { return use_mean; };

        virtual void set_use_mean(bool state) { use_mean=state; };

    protected:
        virtual float64_t compute(int32_t idx_a, int32_t idx_b);

    private:
        void init();

    protected:
        bool disable_sqrt;

        bool use_mean;

        SGVector<float64_t> mean;
        SGMatrix<float64_t> icov;
};

} // namespace shogun
#endif /* HAVE_LAPACK */
#endif /* _MAHALANOBISDISTANCE_H__ */