SparseDistance.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) 2007-2009 Soeren Sonnenburg
 * Copyright (C) 2007-2009 Fraunhofer Institute FIRST and Max-Planck-Society
 */

#ifndef _SPARSEDISTANCE_H___
#define _SPARSEDISTANCE_H___

#include <shogun/distance/Distance.h>
#include <shogun/features/SparseFeatures.h>

namespace shogun
{
template <class ST> class CSparseDistance : public CDistance
{
    public:
        CSparseDistance() : CDistance() {}

        virtual bool init(CFeatures* l, CFeatures* r)
        {
            CDistance::init(l,r);

            ASSERT(l->get_feature_class()==C_SPARSE);
            ASSERT(r->get_feature_class()==C_SPARSE);
            ASSERT(l->get_feature_type()==this->get_feature_type());
            ASSERT(r->get_feature_type()==this->get_feature_type());

            if (((CSparseFeatures<ST>*) lhs)->get_num_features() != ((CSparseFeatures<ST>*) rhs)->get_num_features() )
            {
                SG_ERROR( "train or test features #dimension mismatch (l:%d vs. r:%d)\n",
                        ((CSparseFeatures<ST>*) lhs)->get_num_features(),((CSparseFeatures<ST>*)rhs)->get_num_features());
            }
            return true;
        }

        virtual EFeatureClass get_feature_class() { return C_SPARSE; }

        virtual EFeatureType get_feature_type();

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

        virtual void cleanup()=0;

        virtual EDistanceType get_distance_type()=0;
};

template<> inline EFeatureType CSparseDistance<float64_t>::get_feature_type() { return F_DREAL; }

template<> inline EFeatureType CSparseDistance<uint64_t>::get_feature_type() { return F_ULONG; }

template<> inline EFeatureType CSparseDistance<int32_t>::get_feature_type() { return F_INT; }

template<> inline EFeatureType CSparseDistance<uint16_t>::get_feature_type() { return F_WORD; }

template<> inline EFeatureType CSparseDistance<int16_t>::get_feature_type() { return F_SHORT; }

template<> inline EFeatureType CSparseDistance<uint8_t>::get_feature_type() { return F_BYTE; }

template<> inline EFeatureType CSparseDistance<char>::get_feature_type() { return F_CHAR; }
} // namespace shogun
#endif