org.apache.mahout.ga.watchmaker.cd.hadoop.CDMahoutEvaluatorTest.java Source code

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/**
 * 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.cd.hadoop;

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

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.mahout.common.MahoutTestCase;
import org.apache.mahout.common.RandomUtils;
import org.apache.mahout.ga.watchmaker.cd.CDFitness;
import org.apache.mahout.ga.watchmaker.cd.Rule;
import org.apache.mahout.ga.watchmaker.cd.utils.RandomRule;
import org.apache.mahout.ga.watchmaker.cd.utils.RandomRuleResults;

import com.google.common.io.Resources;

public class CDMahoutEvaluatorTest extends MahoutTestCase {

    public void testEvaluate() throws Exception {
        int nbrules = 100;
        Random rng = RandomUtils.getRandom();
        int target = 1;

        // random rules
        List<Rule> rules = new ArrayList<Rule>();
        for (int index = 0; index < nbrules; index++) {
            rules.add(new RandomRule(index, target, rng));
        }

        // dataset
        // This is sensitive to the working directory where the test is run:
        FileSystem fs = FileSystem.get(new Configuration());
        Path input = fs.makeQualified(new Path(Resources.getResource("wdbc").toString()));
        CDMahoutEvaluator.initializeDataSet(input);

        // evaluate the rules
        List<CDFitness> results = new ArrayList<CDFitness>();
        Path output = getTestTempDirPath("output");
        fs = output.getFileSystem(new Configuration());
        fs.delete(output, true); // It's unhappy if this directory exists
        CDMahoutEvaluator.evaluate(rules, target, input, output, results);

        // check the results
        for (int index = 0; index < nbrules; index++) {
            assertEquals("rule " + index, RandomRuleResults.getResult(index), results.get(index));
        }

    }

}