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author | BenFradet <benjamin.fradet@gmail.com> | 2015-12-08 12:45:34 -0800 |
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committer | Joseph K. Bradley <joseph@databricks.com> | 2015-12-08 12:45:34 -0800 |
commit | 06746b3005e5e9892d0314bee3bfdfaebc36d3d4 (patch) | |
tree | d0bdd5af1a56b07fe00c6c5c44a0da3f276338e6 /examples/src/main/scala | |
parent | 5cb4695051e3dac847b1ea14d62e54dcf672c31c (diff) | |
download | spark-06746b3005e5e9892d0314bee3bfdfaebc36d3d4.tar.gz spark-06746b3005e5e9892d0314bee3bfdfaebc36d3d4.tar.bz2 spark-06746b3005e5e9892d0314bee3bfdfaebc36d3d4.zip |
[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 <benjamin.fradet@gmail.com>
Closes #10166 from BenFradet/SPARK-12159.
Diffstat (limited to 'examples/src/main/scala')
-rw-r--r-- | examples/src/main/scala/org/apache/spark/examples/ml/IndexToStringExample.scala | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/examples/src/main/scala/org/apache/spark/examples/ml/IndexToStringExample.scala b/examples/src/main/scala/org/apache/spark/examples/ml/IndexToStringExample.scala new file mode 100644 index 0000000000..52537e5bb5 --- /dev/null +++ b/examples/src/main/scala/org/apache/spark/examples/ml/IndexToStringExample.scala @@ -0,0 +1,60 @@ +/* + * 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. + */ + +// scalastyle:off println +package org.apache.spark.examples.ml + +import org.apache.spark.sql.SQLContext +import org.apache.spark.{SparkConf, SparkContext} +// $example on$ +import org.apache.spark.ml.feature.{StringIndexer, IndexToString} +// $example off$ + +object IndexToStringExample { + def main(args: Array[String]) { + val conf = new SparkConf().setAppName("IndexToStringExample") + val sc = new SparkContext(conf) + + val sqlContext = SQLContext.getOrCreate(sc) + + // $example on$ + val df = sqlContext.createDataFrame(Seq( + (0, "a"), + (1, "b"), + (2, "c"), + (3, "a"), + (4, "a"), + (5, "c") + )).toDF("id", "category") + + val indexer = new StringIndexer() + .setInputCol("category") + .setOutputCol("categoryIndex") + .fit(df) + val indexed = indexer.transform(df) + + val converter = new IndexToString() + .setInputCol("categoryIndex") + .setOutputCol("originalCategory") + + val converted = converter.transform(indexed) + converted.select("id", "originalCategory").show() + // $example off$ + sc.stop() + } +} +// scalastyle:on println |