/// <summary>
/// Runs of the aMOCell2 algorithm.
/// </summary>
/// <returns>a <code>SolutionSet</code> that is a set of non dominated solutions
/// as a result of the algorithm execution</returns>
public override SolutionSet Execute()
{
//Init the param
int populationSize = -1,
archiveSize = -1,
maxEvaluations = -1,
evaluations = -1;
Operator mutationOperator, crossoverOperator, selectionOperator;
SolutionSet currentSolutionSet;
CrowdingArchive archive;
SolutionSet[] neighbors;
Neighborhood neighborhood;
IComparer <Solution> dominance = new DominanceComparator(),
crowding = new CrowdingComparator();
Distance distance = new Distance();
//Read the params
JMetalCSharp.Utils.Utils.GetIntValueFromParameter(this.InputParameters, "populationSize", ref populationSize);
JMetalCSharp.Utils.Utils.GetIntValueFromParameter(this.InputParameters, "archiveSize", ref archiveSize);
JMetalCSharp.Utils.Utils.GetIntValueFromParameter(this.InputParameters, "maxEvaluations", ref maxEvaluations);
//Read the operators
mutationOperator = Operators["mutation"];
crossoverOperator = Operators["crossover"];
selectionOperator = Operators["selection"];
//Initialize the variables
currentSolutionSet = new SolutionSet(populationSize);
archive = new CrowdingArchive(archiveSize, this.Problem.NumberOfObjectives);
evaluations = 0;
neighborhood = new Neighborhood(populationSize);
neighbors = new SolutionSet[populationSize];
//Create the initial population
for (int i = 0; i < populationSize; i++)
{
Solution solution = new Solution(this.Problem);
this.Problem.Evaluate(solution);
this.Problem.EvaluateConstraints(solution);
currentSolutionSet.Add(solution);
solution.Location = i;
evaluations++;
}
while (evaluations < maxEvaluations)
{
for (int ind = 0; ind < currentSolutionSet.Size(); ind++)
{
Solution individual = new Solution(currentSolutionSet.Get(ind));
Solution[] parents = new Solution[2];
Solution[] offSpring;
neighbors[ind] = neighborhood.GetEightNeighbors(currentSolutionSet, ind);
neighbors[ind].Add(individual);
//parents
parents[0] = (Solution)selectionOperator.Execute(neighbors[ind]);
if (archive.Size() > 0)
{
parents[1] = (Solution)selectionOperator.Execute(archive);
}
else
{
parents[1] = (Solution)selectionOperator.Execute(neighbors[ind]);
}
//Create a new solution, using genetic operators mutation and crossover
offSpring = (Solution[])crossoverOperator.Execute(parents);
mutationOperator.Execute(offSpring[0]);
//->Evaluate solution and constraints
this.Problem.Evaluate(offSpring[0]);
this.Problem.EvaluateConstraints(offSpring[0]);
evaluations++;
int flag = dominance.Compare(individual, offSpring[0]);
if (flag == 1)
{ // OffSpring[0] dominates
offSpring[0].Location = individual.Location;
currentSolutionSet.Replace(offSpring[0].Location, offSpring[0]);
archive.Add(new Solution(offSpring[0]));
}
else if (flag == 0)
{ //Both two are non-dominated
neighbors[ind].Add(offSpring[0]);
Ranking rank = new Ranking(neighbors[ind]);
for (int j = 0; j < rank.GetNumberOfSubfronts(); j++)
{
distance.CrowdingDistanceAssignment(rank.GetSubfront(j), this.Problem.NumberOfObjectives);
}
bool deleteMutant = true;
int compareResult = crowding.Compare(individual, offSpring[0]);
if (compareResult == 1)
{ //The offSpring[0] is better
deleteMutant = false;
}
if (!deleteMutant)
{
offSpring[0].Location = individual.Location;
currentSolutionSet.Replace(offSpring[0].Location, offSpring[0]);
archive.Add(new Solution(offSpring[0]));
}
else
{
archive.Add(new Solution(offSpring[0]));
}
}
}
}
Result = archive;
return(archive);
}
/// <summary>
/// Runs of the Paes algorithm.
/// </summary>
/// <returns>a <code>SolutionSet</code> that is a set of non dominated solutions
/// as a result of the algorithm execution </returns>
public override SolutionSet Execute()
{
int bisections = -1,
archiveSize = -1,
maxEvaluations = -1,
evaluations;
AdaptiveGridArchive archive;
Operator mutationOperator;
IComparer <Solution> dominance;
//Read the params
JMetalCSharp.Utils.Utils.GetIntValueFromParameter(this.InputParameters, "biSections", ref bisections);
JMetalCSharp.Utils.Utils.GetIntValueFromParameter(this.InputParameters, "archiveSize", ref archiveSize);
JMetalCSharp.Utils.Utils.GetIntValueFromParameter(this.InputParameters, "maxEvaluations", ref maxEvaluations);
//Read the operators
mutationOperator = this.Operators["mutation"];
//Initialize the variables
evaluations = 0;
archive = new AdaptiveGridArchive(archiveSize, bisections, this.Problem.NumberOfObjectives);
dominance = new DominanceComparator();
//-> Create the initial solution and evaluate it and his constraints
Solution solution = new Solution(this.Problem);
this.Problem.Evaluate(solution);
this.Problem.EvaluateConstraints(solution);
evaluations++;
// Add it to the archive
archive.Add(new Solution(solution));
//Iterations....
do
{
// Create the mutate one
Solution mutatedIndividual = new Solution(solution);
mutationOperator.Execute(mutatedIndividual);
this.Problem.Evaluate(mutatedIndividual);
this.Problem.EvaluateConstraints(mutatedIndividual);
evaluations++;
// Check dominance
int flag = dominance.Compare(solution, mutatedIndividual);
if (flag == 1)
{ //If mutate solution dominate
solution = new Solution(mutatedIndividual);
archive.Add(mutatedIndividual);
}
else if (flag == 0)
{ //If none dominate the other
if (archive.Add(mutatedIndividual))
{
solution = Test(solution, mutatedIndividual, archive);
}
}
} while (evaluations < maxEvaluations);
Result = archive;
return(archive);
}
/// <summary>
/// Execute the algorithm
/// </summary>
/// <returns></returns>
public override SolutionSet Execute()
{
int populationSize = -1,
archiveSize = -1,
maxEvaluations = -1,
evaluations = -1,
feedBack = -1;
Operator mutationOperator, crossoverOperator, selectionOperator;
SolutionSet currentPopulation;
CrowdingArchive archive;
SolutionSet[] neighbors;
Neighborhood neighborhood;
IComparer <Solution> dominance = new DominanceComparator();
IComparer <Solution> crowdingComparator = new CrowdingComparator();
Distance distance = new Distance();
//Read the parameters
JMetalCSharp.Utils.Utils.GetIntValueFromParameter(this.InputParameters, "populationSize", ref populationSize);
JMetalCSharp.Utils.Utils.GetIntValueFromParameter(this.InputParameters, "archiveSize", ref archiveSize);
JMetalCSharp.Utils.Utils.GetIntValueFromParameter(this.InputParameters, "maxEvaluations", ref maxEvaluations);
JMetalCSharp.Utils.Utils.GetIntValueFromParameter(this.InputParameters, "feedBack", ref feedBack);
//Read the operators
mutationOperator = Operators["mutation"];
crossoverOperator = Operators["crossover"];
selectionOperator = Operators["selection"];
//Initialize the variables
//Initialize the population and the archive
currentPopulation = new SolutionSet(populationSize);
archive = new CrowdingArchive(archiveSize, this.Problem.NumberOfObjectives);
evaluations = 0;
neighborhood = new Neighborhood(populationSize);
neighbors = new SolutionSet[populationSize];
//Create the comparator for check dominance
dominance = new DominanceComparator();
//Create the initial population
for (int i = 0; i < populationSize; i++)
{
Solution individual = new Solution(this.Problem);
this.Problem.Evaluate(individual);
this.Problem.EvaluateConstraints(individual);
currentPopulation.Add(individual);
individual.Location = i;
evaluations++;
}
while (evaluations < maxEvaluations)
{
for (int ind = 0; ind < currentPopulation.Size(); ind++)
{
Solution individual = new Solution(currentPopulation.Get(ind));
Solution[] parents = new Solution[2];
Solution[] offSpring;
neighbors[ind] = neighborhood.GetEightNeighbors(currentPopulation, ind);
neighbors[ind].Add(individual);
//parents
parents[0] = (Solution)selectionOperator.Execute(neighbors[ind]);
parents[1] = (Solution)selectionOperator.Execute(neighbors[ind]);
//Create a new individual, using genetic operators mutation and crossover
offSpring = (Solution[])crossoverOperator.Execute(parents);
mutationOperator.Execute(offSpring[0]);
//->Evaluate individual an his constraints
this.Problem.Evaluate(offSpring[0]);
this.Problem.EvaluateConstraints(offSpring[0]);
evaluations++;
//<-Individual evaluated
int flag = dominance.Compare(individual, offSpring[0]);
if (flag == 1)
{ //The new individuals dominate
offSpring[0].Location = individual.Location;
currentPopulation.Replace(offSpring[0].Location, offSpring[0]);
archive.Add(new Solution(offSpring[0]));
}
else if (flag == 0)
{ //The individuals are non-dominates
neighbors[ind].Add(offSpring[0]);
offSpring[0].Location = -1;
Ranking rank = new Ranking(neighbors[ind]);
for (int j = 0; j < rank.GetNumberOfSubfronts(); j++)
{
distance.CrowdingDistanceAssignment(rank.GetSubfront(j), this.Problem.NumberOfObjectives);
}
Solution worst = neighbors[ind].Worst(crowdingComparator);
if (worst.Location == -1)
{ //The worst is the offspring
archive.Add(new Solution(offSpring[0]));
}
else
{
offSpring[0].Location = worst.Location;
currentPopulation.Replace(offSpring[0].Location, offSpring[0]);
archive.Add(new Solution(offSpring[0]));
}
}
}
//Store a portion of the archive into the population
distance.CrowdingDistanceAssignment(archive, this.Problem.NumberOfObjectives);
for (int j = 0; j < feedBack; j++)
{
if (archive.Size() > j)
{
int r = JMetalRandom.Next(0, currentPopulation.Size() - 1);
if (r < currentPopulation.Size())
{
Solution individual = archive.Get(j);
individual.Location = r;
currentPopulation.Replace(r, new Solution(individual));
}
}
}
}
Result = archive;
return(archive);
}
/**
* Runs of the GDE3 algorithm.
* @return a <code>SolutionSet</code> that is a set of non dominated solutions
* as a result of the algorithm execution
* @throws JMException
*/
public override SolutionSet Execute()
{
int populationSize = -1;
int maxIterations = -1;
int evaluations;
int iterations;
SolutionSet population;
SolutionSet offspringPopulation;
Distance distance;
IComparer <Solution> dominance;
Operator selectionOperator;
Operator crossoverOperator;
distance = new Distance();
dominance = new DominanceComparator();
Solution[] parent;
//Read the parameters
JMetalCSharp.Utils.Utils.GetIntValueFromParameter(this.InputParameters, "populationSize", ref populationSize);
JMetalCSharp.Utils.Utils.GetIntValueFromParameter(this.InputParameters, "maxIterations", ref maxIterations);
selectionOperator = this.Operators["selection"];
crossoverOperator = this.Operators["crossover"];
//Initialize the variables
population = new SolutionSet(populationSize);
evaluations = 0;
iterations = 0;
// Create the initial solutionSet
Solution newSolution;
for (int i = 0; i < populationSize; i++)
{
newSolution = new Solution(this.Problem);
this.Problem.Evaluate(newSolution);
this.Problem.EvaluateConstraints(newSolution);
evaluations++;
population.Add(newSolution);
}
// Generations ...
while (iterations < maxIterations)
{
// Create the offSpring solutionSet
offspringPopulation = new SolutionSet(populationSize * 2);
for (int i = 0; i < populationSize; i++)
{
// Obtain parents. Two parameters are required: the population and the
// index of the current individual
parent = (Solution[])selectionOperator.Execute(new object[] { population, i });
Solution child;
// Crossover. Two parameters are required: the current individual and the
// array of parents
child = (Solution)crossoverOperator.Execute(new object[] { population.Get(i), parent });
this.Problem.Evaluate(child);
this.Problem.EvaluateConstraints(child);
evaluations++;
// Dominance test
int result;
result = dominance.Compare(population.Get(i), child);
if (result == -1)
{ // Solution i dominates child
offspringPopulation.Add(population.Get(i));
}
else if (result == 1)
{ // child dominates
offspringPopulation.Add(child);
}
else
{ // the two solutions are non-dominated
offspringPopulation.Add(child);
offspringPopulation.Add(population.Get(i));
}
}
// Ranking the offspring population
Ranking ranking = new Ranking(offspringPopulation);
int remain = populationSize;
int index = 0;
SolutionSet front = null;
population.Clear();
// Obtain the next front
front = ranking.GetSubfront(index);
while ((remain > 0) && (remain >= front.Size()))
{
//Assign crowding distance to individuals
distance.CrowdingDistanceAssignment(front, this.Problem.NumberOfObjectives);
//Add the individuals of this front
for (int k = 0; k < front.Size(); k++)
{
population.Add(front.Get(k));
} // for
//Decrement remain
remain = remain - front.Size();
//Obtain the next front
index++;
if (remain > 0)
{
front = ranking.GetSubfront(index);
}
}
// remain is less than front(index).size, insert only the best one
if (remain > 0)
{ // front contains individuals to insert
while (front.Size() > remain)
{
distance.CrowdingDistanceAssignment(front, this.Problem.NumberOfObjectives);
front.Remove(front.IndexWorst(new CrowdingComparator()));
}
for (int k = 0; k < front.Size(); k++)
{
population.Add(front.Get(k));
}
remain = 0;
}
iterations++;
}
// Return the first non-dominated front
Ranking rnk = new Ranking(population);
this.Result = rnk.GetSubfront(0);
return(this.Result);
}
