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[SPARK-12159][ML] Add user guide section for IndexToString transformer
Documentation regarding the `IndexToString` label transformer with code snippets in Scala/Java/Python. Author: BenFradet <[email protected]> Closes apache#10166 from BenFradet/SPARK-12159.
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examples/src/main/java/org/apache/spark/examples/ml/JavaIndexToStringExample.java
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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. | ||
| */ | ||
|
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| package org.apache.spark.examples.ml; | ||
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| import org.apache.spark.SparkConf; | ||
| import org.apache.spark.api.java.JavaRDD; | ||
| import org.apache.spark.api.java.JavaSparkContext; | ||
| import org.apache.spark.sql.SQLContext; | ||
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| // $example on$ | ||
| import java.util.Arrays; | ||
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| import org.apache.spark.ml.feature.IndexToString; | ||
| import org.apache.spark.ml.feature.StringIndexer; | ||
| import org.apache.spark.ml.feature.StringIndexerModel; | ||
| import org.apache.spark.sql.DataFrame; | ||
| import org.apache.spark.sql.Row; | ||
| import org.apache.spark.sql.RowFactory; | ||
| import org.apache.spark.sql.types.DataTypes; | ||
| import org.apache.spark.sql.types.Metadata; | ||
| import org.apache.spark.sql.types.StructField; | ||
| import org.apache.spark.sql.types.StructType; | ||
| // $example off$ | ||
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| public class JavaIndexToStringExample { | ||
| public static void main(String[] args) { | ||
| SparkConf conf = new SparkConf().setAppName("JavaIndexToStringExample"); | ||
| JavaSparkContext jsc = new JavaSparkContext(conf); | ||
| SQLContext sqlContext = new SQLContext(jsc); | ||
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| // $example on$ | ||
| JavaRDD<Row> jrdd = jsc.parallelize(Arrays.asList( | ||
| RowFactory.create(0, "a"), | ||
| RowFactory.create(1, "b"), | ||
| RowFactory.create(2, "c"), | ||
| RowFactory.create(3, "a"), | ||
| RowFactory.create(4, "a"), | ||
| RowFactory.create(5, "c") | ||
| )); | ||
| StructType schema = new StructType(new StructField[]{ | ||
| new StructField("id", DataTypes.IntegerType, false, Metadata.empty()), | ||
| new StructField("category", DataTypes.StringType, false, Metadata.empty()) | ||
| }); | ||
| DataFrame df = sqlContext.createDataFrame(jrdd, schema); | ||
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| StringIndexerModel indexer = new StringIndexer() | ||
| .setInputCol("category") | ||
| .setOutputCol("categoryIndex") | ||
| .fit(df); | ||
| DataFrame indexed = indexer.transform(df); | ||
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| IndexToString converter = new IndexToString() | ||
| .setInputCol("categoryIndex") | ||
| .setOutputCol("originalCategory"); | ||
| DataFrame converted = converter.transform(indexed); | ||
| converted.select("id", "originalCategory").show(); | ||
| // $example off$ | ||
| jsc.stop(); | ||
| } | ||
| } |
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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. | ||
| # | ||
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| from __future__ import print_function | ||
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| from pyspark import SparkContext | ||
| # $example on$ | ||
| from pyspark.ml.feature import IndexToString, StringIndexer | ||
| # $example off$ | ||
| from pyspark.sql import SQLContext | ||
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| if __name__ == "__main__": | ||
| sc = SparkContext(appName="IndexToStringExample") | ||
| sqlContext = SQLContext(sc) | ||
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| # $example on$ | ||
| df = sqlContext.createDataFrame( | ||
| [(0, "a"), (1, "b"), (2, "c"), (3, "a"), (4, "a"), (5, "c")], | ||
| ["id", "category"]) | ||
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| stringIndexer = StringIndexer(inputCol="category", outputCol="categoryIndex") | ||
| model = stringIndexer.fit(df) | ||
| indexed = model.transform(df) | ||
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| converter = IndexToString(inputCol="categoryIndex", outputCol="originalCategory") | ||
| converted = converter.transform(indexed) | ||
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| converted.select("id", "originalCategory").show() | ||
| # $example off$ | ||
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| sc.stop() |
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examples/src/main/scala/org/apache/spark/examples/ml/IndexToStringExample.scala
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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. | ||
| */ | ||
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| // scalastyle:off println | ||
| package org.apache.spark.examples.ml | ||
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| import org.apache.spark.sql.SQLContext | ||
| import org.apache.spark.{SparkConf, SparkContext} | ||
| // $example on$ | ||
| import org.apache.spark.ml.feature.{StringIndexer, IndexToString} | ||
| // $example off$ | ||
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| object IndexToStringExample { | ||
| def main(args: Array[String]) { | ||
| val conf = new SparkConf().setAppName("IndexToStringExample") | ||
| val sc = new SparkContext(conf) | ||
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| val sqlContext = SQLContext.getOrCreate(sc) | ||
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| // $example on$ | ||
| val df = sqlContext.createDataFrame(Seq( | ||
| (0, "a"), | ||
| (1, "b"), | ||
| (2, "c"), | ||
| (3, "a"), | ||
| (4, "a"), | ||
| (5, "c") | ||
| )).toDF("id", "category") | ||
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| val indexer = new StringIndexer() | ||
| .setInputCol("category") | ||
| .setOutputCol("categoryIndex") | ||
| .fit(df) | ||
| val indexed = indexer.transform(df) | ||
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| val converter = new IndexToString() | ||
| .setInputCol("categoryIndex") | ||
| .setOutputCol("originalCategory") | ||
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| val converted = converter.transform(indexed) | ||
| converted.select("id", "originalCategory").show() | ||
| // $example off$ | ||
| sc.stop() | ||
| } | ||
| } | ||
| // scalastyle:on println |