home | career | drupal | java | mac | mysql | perl | scala | uml | unix  

Java example source code file (UniformCrossoverTest.java)

This example Java source code file (UniformCrossoverTest.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

arraylist, beforeclass, chromosomepair, crossoverpolicy, dummybinarychromosome, integer, len, list, suppresswarnings, test, uniformcrossover, uniformcrossovertest, util

The UniformCrossoverTest.java Java example source code

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.commons.math3.genetics;

import java.util.ArrayList;
import java.util.List;

import org.junit.Assert;

import org.apache.commons.math3.exception.DimensionMismatchException;
import org.apache.commons.math3.exception.MathIllegalArgumentException;
import org.apache.commons.math3.exception.OutOfRangeException;
import org.junit.BeforeClass;
import org.junit.Test;

public class UniformCrossoverTest {
    private static final int LEN = 10000;
    private static final List<Integer> p1 = new ArrayList(LEN);
    private static final List<Integer> p2 = new ArrayList(LEN);

    @SuppressWarnings("boxing")
    @BeforeClass
    public static void setUpBeforeClass() {
        for (int i = 0; i < LEN; i++) {
            p1.add(0);
            p2.add(1);
        }
    }

    @Test(expected = OutOfRangeException.class)
    public void testRatioTooLow() {
        new UniformCrossover<Integer>(-0.5d);
    }

    @Test(expected = OutOfRangeException.class)
    public void testRatioTooHigh() {
        new UniformCrossover<Integer>(1.5d);
    }

    @Test
    public void testCrossover() {
        // test crossover with different ratios
        performCrossover(0.5);
        performCrossover(0.7);
        performCrossover(0.2);
    }

    private void performCrossover(double ratio) {
        final DummyBinaryChromosome p1c = new DummyBinaryChromosome(p1);
        final DummyBinaryChromosome p2c = new DummyBinaryChromosome(p2);

        final CrossoverPolicy cp = new UniformCrossover<Integer>(ratio);

        // make a number of rounds
        for (int i = 0; i < 20; i++) {
            final ChromosomePair pair = cp.crossover(p1c, p2c);

            final List<Integer> c1 = ((DummyBinaryChromosome) pair.getFirst()).getRepresentation();
            final List<Integer> c2 = ((DummyBinaryChromosome) pair.getSecond()).getRepresentation();

            int from1 = 0;
            int from2 = 0;

            // check first child
            for (int val : c1) {
                if (val == 0) {
                    from1++;
                } else {
                    from2++;
                }
            }

            Assert.assertEquals(1.0 - ratio, (double) from1 / LEN, 0.1);
            Assert.assertEquals(ratio, (double) from2 / LEN, 0.1);

            from1 = 0;
            from2 = 0;

            // check second child
            for (int val : c2) {
                if (val == 0) {
                    from1++;
                } else {
                    from2++;
                }
            }

            Assert.assertEquals(ratio, (double) from1 / LEN, 0.1);
            Assert.assertEquals(1.0 - ratio, (double) from2 / LEN, 0.1);
        }
    }

    @Test(expected = DimensionMismatchException.class)
    public void testCrossoverDimensionMismatchException(){
        @SuppressWarnings("boxing")
        final Integer[] p1 = new Integer[] {1,0,1,0,0,1,0,1,1};
        @SuppressWarnings("boxing")
        final Integer[] p2 = new Integer[] {0,1,1,0,1};

        final BinaryChromosome p1c = new DummyBinaryChromosome(p1);
        final BinaryChromosome p2c = new DummyBinaryChromosome(p2);

        final CrossoverPolicy cp = new UniformCrossover<Integer>(0.5d);
        cp.crossover(p1c, p2c);
    }

    @Test(expected = MathIllegalArgumentException.class)
    public void testCrossoverInvalidFixedLengthChromosomeFirst() {
        @SuppressWarnings("boxing")
        final Integer[] p1 = new Integer[] {1,0,1,0,0,1,0,1,1};
        final BinaryChromosome p1c = new DummyBinaryChromosome(p1);
        final Chromosome p2c = new Chromosome() {
            public double fitness() {
                // Not important
                return 0;
            }
        };

        final CrossoverPolicy cp = new UniformCrossover<Integer>(0.5d);
        cp.crossover(p1c, p2c);
    }

    @Test(expected = MathIllegalArgumentException.class)
    public void testCrossoverInvalidFixedLengthChromosomeSecond() {
        @SuppressWarnings("boxing")
        final Integer[] p1 = new Integer[] {1,0,1,0,0,1,0,1,1};
        final BinaryChromosome p2c = new DummyBinaryChromosome(p1);
        final Chromosome p1c = new Chromosome() {
            public double fitness() {
                // Not important
                return 0;
            }
        };

        final CrossoverPolicy cp = new UniformCrossover<Integer>(0.5d);
        cp.crossover(p1c, p2c);
    }
}

Other Java examples (source code examples)

Here is a short list of links related to this Java UniformCrossoverTest.java source code file:



my book on functional programming

 

new blog posts

 

Copyright 1998-2021 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.