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StableHeuristic.java
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StableHeuristic.java
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/**
* Copyright (C) 2007 - 2016, Jens Lehmann
*
* This file is part of DL-Learner.
*
* DL-Learner 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.
*
* DL-Learner 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.dllearner.algorithms.el;
import com.google.common.collect.ComparisonChain;
import org.dllearner.core.ComponentAnn;
import org.dllearner.core.ComponentInitException;
/**
* A stable comparator for search tree nodes. Stable means that the order
* of nodes will not change during the run of the learning algorithm. In
* this implementation, this is ensured by using only covered examples
* and tree size as criteria.
*
* @author Jens Lehmann
*
*/
@ComponentAnn(name = "Stable Heuristic", shortName = "el_heuristic", version = 0.1)
public class StableHeuristic implements ELHeuristic {
private final ELDescriptionTreeComparator cmp = new ELDescriptionTreeComparator();
@Override
public int compare(SearchTreeNode o1, SearchTreeNode o2) {
return ComparisonChain.start()
.compare(o1.getScore().getAccuracy(), o2.getScore().getAccuracy())
.compare(o2.getDescriptionTree().size, o1.getDescriptionTree().size)
.compare(o1.getDescriptionTree(), o2.getDescriptionTree(), cmp)
.result();
}
/* (non-Javadoc)
* @see org.dllearner.core.Component#init()
*/
@Override
public void init() throws ComponentInitException {}
@Override
public double getNodeScore(SearchTreeNode node) {
return node.getScore().getAccuracy();
}
}