ChiSquareDistance.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) 2008-2009 Christian Gehl
 * Copyright (C) 2008-2009 Fraunhofer Institute FIRST
 */

#ifndef _CHISQUAREDISTANCE_H___
#define __CHISQUAREDISTANCE___

#include <shogun/lib/common.h>
#include <shogun/distance/SimpleDistance.h>
#include <shogun/features/SimpleFeatures.h>

namespace shogun
{
class CChiSquareDistance: public CSimpleDistance<float64_t>
{
    public:
        CChiSquareDistance();

        CChiSquareDistance(CSimpleFeatures<float64_t>* l, CSimpleFeatures<float64_t>* r);
        virtual ~CChiSquareDistance();

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

        virtual void cleanup();

        virtual EDistanceType get_distance_type() { return D_CHISQUARE; }

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

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

} // namespace shogun
#endif /* _CHISQUAREDISTANCE_H___ */