moeoContributionMetric.h

// -*- mode: c++; c-indent-level: 4; c++-member-init-indent: 8; comment-column: 35; -*-

//-----------------------------------------------------------------------------
// moeoContributionMetric.h
// (c) OPAC Team (LIFL), Dolphin Project (INRIA), 2007
/*
    This library...

    Contact: paradiseo-help@lists.gforge.inria.fr, http://paradiseo.gforge.inria.fr
 */
//-----------------------------------------------------------------------------

#ifndef MOEOCONTRIBUTIONMETRIC_H_
#define MOEOCONTRIBUTIONMETRIC_H_

#include <metric/moeoMetric.h>

template < class ObjectiveVector >
class moeoContributionMetric : public moeoVectorVsVectorBinaryMetric < ObjectiveVector, double >
{
public:

    double operator()(const std::vector < ObjectiveVector > & _set1, const std::vector < ObjectiveVector > & _set2) {
        unsigned c  = card_C(_set1, _set2);
        unsigned w1 = card_W(_set1, _set2);
        unsigned n1 = card_N(_set1, _set2);
        unsigned w2 = card_W(_set2, _set1);
        unsigned n2 = card_N(_set2, _set1);
        return (double) (c / 2.0 + w1 + n1) / (c + w1 + n1 + w2 + n2);
    }


private:

    unsigned card_C (const std::vector < ObjectiveVector > & _set1, const std::vector < ObjectiveVector > & _set2) {
        unsigned c=0;
        for (unsigned i=0; i<_set1.size(); i++)
            for (unsigned j=0; j<_set2.size(); j++)
                if (_set1[i] == _set2[j]) {
                    c++;
                    break;
                }
        return c;
    }

    unsigned card_W (const std::vector < ObjectiveVector > & _set1, const std::vector < ObjectiveVector > & _set2) {
        unsigned w=0;
        for (unsigned i=0; i<_set1.size(); i++)
            for (unsigned j=0; j<_set2.size(); j++)
                if (_set1[i].dominates(_set2[j])) {
                    w++;
                    break;
                }
        return w;
    }

    unsigned card_N (const std::vector < ObjectiveVector > & _set1, const std::vector < ObjectiveVector > & _set2) {
        unsigned n=0;
        for (unsigned i=0; i<_set1.size(); i++) {
            bool domin_rel = false;
            for (unsigned j=0; j<_set2.size(); j++)
                if (_set1[i].dominates(_set2[j]) || _set2[j].dominates(_set1 [i])) {
                    domin_rel = true;
                    break;
                }
            if (! domin_rel)
                n++;
        }
        return n;
    }

};

#endif /*MOEOCONTRIBUTIONMETRIC_H_*/

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