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package de.lmu.ifi.dbs.elki.algorithm.clustering.trivial;
import de.lmu.ifi.dbs.elki.data.ClassLabel;
import de.lmu.ifi.dbs.elki.data.Cluster;
import de.lmu.ifi.dbs.elki.data.Clustering;
import de.lmu.ifi.dbs.elki.data.model.ClusterModel;
import de.lmu.ifi.dbs.elki.data.model.Model;
import de.lmu.ifi.dbs.elki.data.type.NoSupportedDataTypeException;
import de.lmu.ifi.dbs.elki.data.type.TypeUtil;
import de.lmu.ifi.dbs.elki.database.Database;
import de.lmu.ifi.dbs.elki.database.ids.DBIDs;
import de.lmu.ifi.dbs.elki.database.relation.Relation;
/*
This file is part of ELKI:
Environment for Developing KDD-Applications Supported by Index-Structures
Copyright (C) 2013
Ludwig-Maximilians-Universität München
Lehr- und Forschungseinheit für Datenbanksysteme
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 <http://www.gnu.org/licenses/>.
*/
/**
* Trivial class that will try to cluster by label, and fall back to an
* "all-in-one" clustering.
*
* @author Erich Schubert
*/
public class ByLabelOrAllInOneClustering extends ByLabelClustering {
/**
* Constructor.
*/
public ByLabelOrAllInOneClustering() {
super();
}
@Override
public Clustering<Model> run(Database database) {
// Prefer a true class label
try {
Relation<ClassLabel> relation = database.getRelation(TypeUtil.CLASSLABEL);
return run(relation);
}
catch(NoSupportedDataTypeException e) {
// Ignore.
}
try {
Relation<ClassLabel> relation = database.getRelation(TypeUtil.GUESSED_LABEL);
return run(relation);
}
catch(NoSupportedDataTypeException e) {
// Ignore.
}
final DBIDs ids = database.getRelation(TypeUtil.ANY).getDBIDs();
Clustering<Model> result = new Clustering<>("All-in-one trivial Clustering", "allinone-clustering");
Cluster<Model> c = new Cluster<Model>(ids, ClusterModel.CLUSTER);
result.addToplevelCluster(c);
return result;
}
}
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