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An Open Source Java Framework for Multiobjective Optimization
/* Copyright 2009-2016 David Hadka
*
* This file is part of the MOEA Framework.
*
* The MOEA Framework is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or (at your
* option) any later version.
*
* The MOEA Framework 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 Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with the MOEA Framework. If not, see .
*/
import java.io.File;
import java.io.IOException;
import org.moeaframework.Executor;
import org.moeaframework.core.NondominatedPopulation;
import org.moeaframework.core.Solution;
import org.moeaframework.core.variable.RealVariable;
import org.moeaframework.problem.ExternalProblem;
/**
* Demonstrates how problems can be defined externally to the MOEA Framework,
* possibly written in a different programming language. In this case, the
* problem is defined in the file ./examples/dtlz2.c using the C programming
* language. Run the command 'make' in the ./examples/ folder to compile
* the executable.
*/
public class Example5 {
/**
* The ExternalProblem opens a communication channel with the external
* process defined in the constructor.
*/
public static class MyDTLZ2 extends ExternalProblem {
public MyDTLZ2() throws IOException {
super("./examples/dtlz2_stdio.exe");
}
@Override
public String getName() {
return "DTLZ2";
}
@Override
public int getNumberOfVariables() {
return 11;
}
@Override
public int getNumberOfObjectives() {
return 2;
}
@Override
public int getNumberOfConstraints() {
return 0;
}
@Override
public Solution newSolution() {
Solution solution = new Solution(getNumberOfVariables(),
getNumberOfObjectives());
for (int i = 0; i < getNumberOfVariables(); i++) {
solution.setVariable(i, new RealVariable(0.0, 1.0));
}
return solution;
}
}
public static void main(String[] args) {
//check if the executable exists
File file = new File("./examples/dtlz2_stdio.exe");
if (!file.exists()) {
System.err.println("Please compile the executable by running make in the ./examples/ folder");
return;
}
//configure and run the DTLZ2 function
NondominatedPopulation result = new Executor()
.withProblemClass(MyDTLZ2.class)
.withAlgorithm("NSGAII")
.withMaxEvaluations(10000)
.run();
//display the results
System.out.format("Objective1 Objective2%n");
for (Solution solution : result) {
System.out.format("%.4f %.4f%n",
solution.getObjective(0),
solution.getObjective(1));
}
}
}