ClusteringAccuracy.cpp

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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 Chiyuan Zhang
 * Copyright (C) 2012 Chiyuan Zhang
 */

#include <shogun/evaluation/ClusteringAccuracy.h>
#include <shogun/labels/MulticlassLabels.h>

using namespace shogun;

float64_t CClusteringAccuracy::evaluate(CLabels* predicted, CLabels* ground_truth)
{
    ASSERT(predicted && ground_truth);
    ASSERT(ground_truth->get_label_type() == LT_MULTICLASS);
    ASSERT(predicted->get_label_type() == LT_MULTICLASS);
    SGVector<int32_t> predicted_ilabels=((CMulticlassLabels*) predicted)->get_int_labels();
    SGVector<int32_t> groundtruth_ilabels=((CMulticlassLabels*) ground_truth)->get_int_labels();
    int32_t correct=0;
    for (int32_t i=0; i < predicted_ilabels.vlen; ++i)
    {
        if (predicted_ilabels[i] == groundtruth_ilabels[i])
            correct++;
    }
    return float64_t(correct)/predicted_ilabels.vlen;
}