/*
* This file is part of ELKI:
* Environment for Developing KDD-Applications Supported by Index-Structures
*
* Copyright (C) 2018
* ELKI Development Team
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see .
*/
package de.lmu.ifi.dbs.elki.algorithm.clustering.kmeans.initialization;
import org.junit.Test;
import de.lmu.ifi.dbs.elki.algorithm.clustering.AbstractClusterAlgorithmTest;
import de.lmu.ifi.dbs.elki.algorithm.clustering.kmeans.CLARA;
import de.lmu.ifi.dbs.elki.algorithm.clustering.kmeans.KMeans;
import de.lmu.ifi.dbs.elki.algorithm.clustering.kmeans.SingleAssignmentKMeans;
import de.lmu.ifi.dbs.elki.data.Clustering;
import de.lmu.ifi.dbs.elki.data.DoubleVector;
import de.lmu.ifi.dbs.elki.database.Database;
import de.lmu.ifi.dbs.elki.utilities.ELKIBuilder;
/**
* Performs a single assignment with different k-means initializations.
*
* @author Erich Schubert
* @since 0.7.5
*/
public class KMeansPlusPlusInitialMeansTest extends AbstractClusterAlgorithmTest {
/**
* Run KMeans with fixed parameters and compare the result to a golden
* standard.
*/
@Test
public void testSingleAssignmentKMeansPlusPlus() {
Database db = makeSimpleDatabase(UNITTEST + "different-densities-2d-no-noise.ascii", 1000);
Clustering> result = new ELKIBuilder>(SingleAssignmentKMeans.class) //
.with(KMeans.K_ID, 5) //
.with(KMeans.SEED_ID, 3) //
.with(KMeans.INIT_ID, KMeansPlusPlusInitialMeans.class) //
.build().run(db);
testFMeasure(db, result, 0.99205);
testClusterSizes(result, new int[] { 197, 199, 200, 201, 203 });
}
/**
* Run CLARA with fixed parameters and compare the result to a golden
* standard.
*/
@Test
public void testSingleAssignmentKMeansPlusPlusMedoids() {
Database db = makeSimpleDatabase(UNITTEST + "different-densities-2d-no-noise.ascii", 1000);
Clustering> result = new ELKIBuilder>(CLARA.class) //
.with(KMeans.K_ID, 5) //
.with(KMeans.SEED_ID, 3) //
.with(KMeans.INIT_ID, KMeansPlusPlusInitialMeans.class) //
.with(KMeans.MAXITER_ID, 1) //
.with(CLARA.Parameterizer.NOKEEPMED_ID) //
.with(CLARA.Parameterizer.SAMPLESIZE_ID, 10) //
.with(CLARA.Parameterizer.RANDOM_ID, 0) //
.build().run(db);
testFMeasure(db, result, 0.99602);
testClusterSizes(result, new int[] { 198, 200, 200, 200, 202 });
}
}