org.apache.spark.examples.ml.OneHotEncoderExample.scala Maven / Gradle / Ivy

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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.
 */

// scalastyle:off println
package org.apache.spark.examples.ml

// $example on$
import org.apache.spark.ml.feature.OneHotEncoder
// $example off$
import org.apache.spark.sql.SparkSession

object OneHotEncoderExample {
  def main(args: Array[String]): Unit = {
    val spark = SparkSession
      .builder
      .appName("OneHotEncoderExample")
      .getOrCreate()

    // Note: categorical features are usually first encoded with StringIndexer
    // $example on$
    val df = spark.createDataFrame(Seq(
      (0.0, 1.0),
      (1.0, 0.0),
      (2.0, 1.0),
      (0.0, 2.0),
      (0.0, 1.0),
      (2.0, 0.0)
    )).toDF("categoryIndex1", "categoryIndex2")

    val encoder = new OneHotEncoder()
      .setInputCols(Array("categoryIndex1", "categoryIndex2"))
      .setOutputCols(Array("categoryVec1", "categoryVec2"))
    val model = encoder.fit(df)

    val encoded = model.transform(df)
    encoded.show()
    // $example off$

    spark.stop()
  }
}
// scalastyle:on println