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

add helper

Browse source
This commit is contained in:
oblonski 2017-06-30 10:44:39 +02:00
parent dfc8068eef
commit d8f7af7fb5
No known key found for this signature in database
GPG key ID: 179DE487285680D1
2 changed files with 53 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

39
jsprit-core/src/main/java/com/graphhopper/jsprit/core/algorithm/acceptor/SchrimpfAcceptance.java
View file

@ -25,7 +25,9 @@ import com.graphhopper.jsprit.core.problem.solution.VehicleRoutingProblemSolutio
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
/**
@ -78,7 +80,6 @@ public class SchrimpfAcceptance implements SolutionAcceptor, IterationStartsList
private final int solutionMemory;
public SchrimpfAcceptance(int solutionMemory, double alpha) {
this.alpha = alpha;
this.solutionMemory = solutionMemory;
@ -110,6 +111,32 @@ public class SchrimpfAcceptance implements SolutionAcceptor, IterationStartsList
return solutionAccepted;
}
public boolean acceptSolution(VehicleRoutingProblemSolution solution, VehicleRoutingProblemSolution newSolution) {
List<VehicleRoutingProblemSolution> solutions = new ArrayList<>();
solutions.add(solution);
boolean solutionAccepted = false;
if (solutions.size() < solutionMemory) {
solutions.add(newSolution);
solutionAccepted = true;
} else {
VehicleRoutingProblemSolution worst = null;
double threshold = getThreshold(currentIteration);
for (VehicleRoutingProblemSolution solutionInMemory : solutions) {
if (worst == null) worst = solutionInMemory;
else if (solutionInMemory.getCost() > worst.getCost()) worst = solutionInMemory;
}
if (worst == null) {
solutions.add(newSolution);
solutionAccepted = true;
} else if (newSolution.getCost() < worst.getCost() + threshold) {
solutions.remove(worst);
solutions.add(newSolution);
solutionAccepted = true;
}
}
return solutionAccepted;
}
@Override
public String toString() {
return "[name=SchrimpfAcceptance][alpha=" + alpha + "]";
@ -136,6 +163,16 @@ public class SchrimpfAcceptance implements SolutionAcceptor, IterationStartsList
this.initialThreshold = initialThreshold;
}
public void setMaxIterations(int maxIteration) {
this.maxIterations = maxIteration;
}
public void incIteration() {
currentIteration++;
}
;
@Override
public void informAlgorithmStarts(VehicleRoutingProblem problem, VehicleRoutingAlgorithm algorithm, Collection<VehicleRoutingProblemSolution> solutions) {
reset();

15
jsprit-core/src/main/java/com/graphhopper/jsprit/core/algorithm/termination/VariationCoefficientTermination.java
View file

@ -30,7 +30,9 @@ import org.apache.commons.math3.stat.descriptive.moment.StandardDeviation;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
/**
@ -119,9 +121,22 @@ public class VariationCoefficientTermination implements PrematureAlgorithmTermin
}
}
public void informIterationEnds(int i, VehicleRoutingProblem problem, VehicleRoutingProblemSolution solution) {
informIterationEnds(i, problem, toList(solution));
}
private List<VehicleRoutingProblemSolution> toList(VehicleRoutingProblemSolution solution) {
List<VehicleRoutingProblemSolution> solutions = new ArrayList<>();
solutions.add(solution);
return solutions;
}
@Override
public void informIterationStarts(int i, VehicleRoutingProblem problem, Collection<VehicleRoutingProblemSolution> solutions) {
if (lastAccepted == null) lastAccepted = Solutions.bestOf(solutions);
}
public void informIterationStarts(int i, VehicleRoutingProblem problem, VehicleRoutingProblemSolution solution) {
informIterationStarts(i, problem, toList(solution));
}
}