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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.spark.ml.tuning;
import java.io.Serializable;
import java.util.List;
import org.junit.After;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
import org.apache.spark.api.java.JavaSparkContext;
import org.apache.spark.ml.classification.LogisticRegression;
import org.apache.spark.ml.evaluation.BinaryClassificationEvaluator;
import org.apache.spark.ml.param.ParamMap;
import org.apache.spark.mllib.regression.LabeledPoint;
import org.apache.spark.sql.DataFrame;
import org.apache.spark.sql.SQLContext;
import static org.apache.spark.mllib.classification.LogisticRegressionSuite.generateLogisticInputAsList;
public class JavaCrossValidatorSuite implements Serializable {
private transient JavaSparkContext jsc;
private transient SQLContext jsql;
private transient DataFrame dataset;
@Before
public void setUp() {
jsc = new JavaSparkContext("local", "JavaCrossValidatorSuite");
jsql = new SQLContext(jsc);
List<LabeledPoint> points = generateLogisticInputAsList(1.0, 1.0, 100, 42);
dataset = jsql.createDataFrame(jsc.parallelize(points, 2), LabeledPoint.class);
}
@After
public void tearDown() {
jsc.stop();
jsc = null;
}
@Test
public void crossValidationWithLogisticRegression() {
LogisticRegression lr = new LogisticRegression();
ParamMap[] lrParamMaps = new ParamGridBuilder()
.addGrid(lr.regParam(), new double[] {0.001, 1000.0})
.addGrid(lr.maxIter(), new int[] {0, 10})
.build();
BinaryClassificationEvaluator eval = new BinaryClassificationEvaluator();
CrossValidator cv = new CrossValidator()
.setEstimator(lr)
.setEstimatorParamMaps(lrParamMaps)
.setEvaluator(eval)
.setNumFolds(3);
CrossValidatorModel cvModel = cv.fit(dataset);
ParamMap bestParamMap = cvModel.bestModel().fittingParamMap();
Assert.assertEquals(0.001, bestParamMap.apply(lr.regParam()));
Assert.assertEquals(10, bestParamMap.apply(lr.maxIter()));
}
}
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