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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.feature;
import java.util.Arrays;
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.JavaRDD;
import org.apache.spark.api.java.JavaSparkContext;
import org.apache.spark.sql.DataFrame;
import org.apache.spark.sql.Row;
import org.apache.spark.sql.RowFactory;
import org.apache.spark.sql.SQLContext;
import org.apache.spark.sql.types.StructField;
import org.apache.spark.sql.types.StructType;
import static org.apache.spark.sql.types.DataTypes.*;
public class JavaStringIndexerSuite {
private transient JavaSparkContext jsc;
private transient SQLContext sqlContext;
@Before
public void setUp() {
jsc = new JavaSparkContext("local", "JavaStringIndexerSuite");
sqlContext = new SQLContext(jsc);
}
@After
public void tearDown() {
jsc.stop();
sqlContext = null;
}
@Test
public void testStringIndexer() {
StructType schema = createStructType(new StructField[] {
createStructField("id", IntegerType, false),
createStructField("label", StringType, false)
});
List<Row> data = Arrays.asList(
cr(0, "a"), cr(1, "b"), cr(2, "c"), cr(3, "a"), cr(4, "a"), cr(5, "c"));
DataFrame dataset = sqlContext.createDataFrame(data, schema);
StringIndexer indexer = new StringIndexer()
.setInputCol("label")
.setOutputCol("labelIndex");
DataFrame output = indexer.fit(dataset).transform(dataset);
Assert.assertArrayEquals(
new Row[] { cr(0, 0.0), cr(1, 2.0), cr(2, 1.0), cr(3, 0.0), cr(4, 0.0), cr(5, 1.0) },
output.orderBy("id").select("id", "labelIndex").collect());
}
/** An alias for RowFactory.create. */
private Row cr(Object... values) {
return RowFactory.create(values);
}
}
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