trans/graphhopper-jsprit
1
0
Fork 0
mirror of https://github.com/graphhopper/jsprit.git synced 2020-01-24 07:45:05 +01:00
Code Issues Releases Wiki Activity

optimize ruin random

Browse source
This commit is contained in:
oblonski 2015-03-29 19:54:32 +02:00
parent 6c1483c04f
commit 545eb71b46
1 changed files with 7 additions and 18 deletions
Download patch file Download diff file Expand all files Collapse all files

25
jsprit-core/src/main/java/jsprit/core/algorithm/ruin/RuinRandom.java
View file

@ -24,7 +24,7 @@ import org.apache.logging.log4j.Logger;
import java.util.ArrayList;
import java.util.Collection;
import java.util.LinkedList;
import java.util.Collections;
import java.util.List;
@ -85,35 +85,24 @@ public final class RuinRandom extends AbstractRuinStrategy {
throw new IllegalStateException("not supported");
}
@Deprecated
public void setRuinFraction(double fractionOfAllNodes2beRuined) {
this.fractionOfAllNodes2beRuined = fractionOfAllNodes2beRuined;
logger.info("fraction set " + this);
}
private void ruin(Collection<VehicleRoute> vehicleRoutes, int nOfJobs2BeRemoved, List<Job> unassignedJobs) {
LinkedList<Job> availableJobs = new LinkedList<Job>(vrp.getJobs().values());
for (int i = 0; i < nOfJobs2BeRemoved; i++) {
if(availableJobs.isEmpty()) break;
Job job = pickRandomJob(availableJobs);
ArrayList<Job> availableJobs = new ArrayList<Job>(vrp.getJobs().values());
Collections.shuffle(availableJobs,random);
int removed = 0;
for (Job job : availableJobs) {
if(removed == nOfJobs2BeRemoved) break;
if(removeJob(job,vehicleRoutes)) {
unassignedJobs.add(job);
availableJobs.remove(job);
}
removed++;
}
}
@Override
public String toString() {
return "[name=randomRuin][noJobsToBeRemoved="+selectNuOfJobs2BeRemoved()+"]";
}
private Job pickRandomJob(LinkedList<Job> availableJobs) {
int randomIndex = random.nextInt(availableJobs.size());
return availableJobs.get(randomIndex);
}
private int selectNuOfJobs2BeRemoved() {
return (int) Math.ceil(vrp.getJobs().values().size() * fractionOfAllNodes2beRuined);
}