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package de.lmu.ifi.dbs.elki.distance.distancefunction.probabilistic;
/*
This file is part of ELKI:
Environment for Developing KDD-Applications Supported by Index-Structures
Copyright (C) 2015
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/>.
*/
import de.lmu.ifi.dbs.elki.data.NumberVector;
import de.lmu.ifi.dbs.elki.data.spatial.SpatialComparable;
import de.lmu.ifi.dbs.elki.utilities.optionhandling.AbstractParameterizer;
/**
* Jensen-Shannon Divergence is essentially the same as Jeffrey divergence, only
* scaled by half.
*
* @author Erich Schubert
* @since 0.6.0
*/
public class JensenShannonDivergenceDistanceFunction extends JeffreyDivergenceDistanceFunction {
/**
* Static instance. Use this!
*/
public static final JensenShannonDivergenceDistanceFunction STATIC = new JensenShannonDivergenceDistanceFunction();
/**
* Constructor for the Jensen-Shannon divergence.
*
* @deprecated Use static instance!
*/
@Deprecated
public JensenShannonDivergenceDistanceFunction() {
super();
}
@Override
public double distance(NumberVector v1, NumberVector v2) {
return .5 * super.distance(v1, v2);
}
@Override
public double minDist(SpatialComparable mbr1, SpatialComparable mbr2) {
return .5 * super.minDist(mbr1, mbr2);
}
@Override
public String toString() {
return "JensenShannonDivergenceDistance";
}
/**
* Parameterization class, using the static instance.
*
* @author Erich Schubert
*
* @apiviz.exclude
*/
public static class Parameterizer extends AbstractParameterizer {
@Override
protected JensenShannonDivergenceDistanceFunction makeInstance() {
return STATIC;
}
}
}
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