Apache Spark 2.x Machine Learning Cookbook

How to do it...

1. Start a new project in IntelliJ or in an IDE of your choice. Make sure the necessary JAR files are included.

2. We define the package information for the Scala program:

package spark.ml.cookbook.chapter7

3. Import the necessary packages:

import org.apache.log4j.{Level, Logger} import org.apache.spark.sql.SparkSession import org.apache.spark.ml.recommendation.ALS

4. We now define two Scala case classes, to model movie and ratings data:

case class Movie(movieId: Int, title: String, year: Int, genre: Seq[String]) case class FullRating(userId: Int, movieId: Int, rating: Float, timestamp: Long)

5. In this step, we define functions for parsing a single line of data from the ratings.dat file into the ratings case class, and for parsing ...