org.apache.spark.examples.ml.NGramExample.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.NGram
// $example off$
import org.apache.spark.sql.SQLContext
import org.apache.spark.{SparkConf, SparkContext}

object NGramExample {
  def main(args: Array[String]): Unit = {
    val conf = new SparkConf().setAppName("NGramExample")
    val sc = new SparkContext(conf)
    val sqlContext = new SQLContext(sc)

    // $example on$
    val wordDataFrame = sqlContext.createDataFrame(Seq(
      (0, Array("Hi", "I", "heard", "about", "Spark")),
      (1, Array("I", "wish", "Java", "could", "use", "case", "classes")),
      (2, Array("Logistic", "regression", "models", "are", "neat"))
    )).toDF("label", "words")

    val ngram = new NGram().setInputCol("words").setOutputCol("ngrams")
    val ngramDataFrame = ngram.transform(wordDataFrame)
    ngramDataFrame.take(3).map(_.getAs[Stream[String]]("ngrams").toList).foreach(println)
    // $example off$
    sc.stop()
  }
}
// scalastyle:on println