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clean, test and document core.algorithm.termination.IterationWithoutImprovementTermination

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oblonski 2014-08-12 12:45:33 +02:00
parent b3dd790be2
commit dce8019b80
2 changed files with 82 additions and 10 deletions
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31
jsprit-core/src/main/java/jsprit/core/algorithm/termination/IterationWithoutImprovementTermination.java
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@ -20,33 +20,44 @@ import jsprit.core.algorithm.SearchStrategy.DiscoveredSolution;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
/**
* Terminates algorithm prematurely based on iterations without any improvement (i.e. new solution acceptance).
*
* <p>Termination will be activated by:<br>
*
* <code>algorithm.setPrematureAlgorithmTermination(this);</code><br>
*
* @author stefan schroeder
*
*/
public class IterationWithoutImprovementTermination implements PrematureAlgorithmTermination{
private static Logger log = LogManager.getLogger(IterationWithoutImprovementTermination.class);
private int nuOfIterationWithoutImprovement;
private int noIterationWithoutImprovement;
private int iterationsWithoutImprovement = 0;
public IterationWithoutImprovementTermination(int nuOfIterationsWithoutImprovement){
this.nuOfIterationWithoutImprovement=nuOfIterationsWithoutImprovement;
/**
* Constructs termination.
*
* @param noIterationsWithoutImprovement previous iterations without any improvement
*/
public IterationWithoutImprovementTermination(int noIterationsWithoutImprovement){
this.noIterationWithoutImprovement =noIterationsWithoutImprovement;
log.info("initialise " + this);
}
@Override
public String toString() {
return "[name=IterationWithoutImprovementBreaker][iterationsWithoutImprovement="+nuOfIterationWithoutImprovement+"]";
return "[name=IterationWithoutImprovementBreaker][iterationsWithoutImprovement="+ noIterationWithoutImprovement +"]";
}
@Override
public boolean isPrematureBreak(DiscoveredSolution discoveredSolution) {
if(discoveredSolution.isAccepted()) iterationsWithoutImprovement = 0;
else iterationsWithoutImprovement++;
if(iterationsWithoutImprovement > nuOfIterationWithoutImprovement){
return true;
}
return false;
return (iterationsWithoutImprovement > noIterationWithoutImprovement);
}