/**
* 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.mahout.ga.watchmaker;
import com.google.common.collect.Lists;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.mahout.common.MahoutTestCase;
import org.apache.mahout.ga.watchmaker.utils.DummyCandidate;
import org.apache.mahout.ga.watchmaker.utils.DummyEvaluator;
import org.apache.mahout.common.StringUtils;
import org.apache.mahout.common.iterator.FileLineIterable;
import org.junit.Test;
import org.uncommons.watchmaker.framework.FitnessEvaluator;
import java.io.IOException;
import java.util.List;
public final class MahoutEvaluatorTest extends MahoutTestCase {
private static final int POPULATION_SIZE = 100;
@Test
public void testEvaluate() throws Exception {
// candidate population
List<DummyCandidate> population = DummyCandidate.generatePopulation(POPULATION_SIZE);
// fitness evaluator
DummyEvaluator.clearEvaluations();
FitnessEvaluator<DummyCandidate> evaluator = new DummyEvaluator();
// run MahoutEvaluator
List<Double> results = Lists.newArrayList();
Path input = getTestTempDirPath("input");
Path output = getTestTempDirPath("output");
MahoutEvaluator.evaluate(evaluator, population, results, input, output);
// check results
assertEquals("Number of evaluations", POPULATION_SIZE, results.size());
for (int index = 0; index < population.size(); index++) {
DummyCandidate candidate = population.get(index);
assertEquals("Evaluation of the candidate " + index,
DummyEvaluator.getFitness(candidate.getIndex()), results.get(index), EPSILON);
}
}
@Test
public void testStoreLoadPopulation() throws Exception {
List<DummyCandidate> population = DummyCandidate.generatePopulation(POPULATION_SIZE);
Path tempPath = getTestTempFilePath("test.txt");
FileSystem fs = tempPath.getFileSystem(new Configuration());
// store the population
MahoutEvaluator.storePopulation(fs, tempPath, population);
// load the population
List<DummyCandidate> inpop = loadPopulation(fs, tempPath);
// check that the file contains the correct population
assertEquals("Population size", population.size(), inpop.size());
for (int index = 0; index < population.size(); index++) {
assertEquals("Bad candidate " + index, population.get(index), inpop.get(index));
}
}
private static List<DummyCandidate> loadPopulation(FileSystem fs, Path f) throws IOException {
List<DummyCandidate> population = Lists.newArrayList();
FSDataInputStream in = fs.open(f);
for (String line : new FileLineIterable(in)) {
population.add(StringUtils.<DummyCandidate>fromString(line));
}
return population;
}
}