Github user holdenk commented on a diff in the pull request: https://github.com/apache/spark/pull/12762#discussion_r61494019 --- Diff: mllib/src/main/scala/org/apache/spark/ml/recommendation/ALS.scala --- @@ -53,24 +53,43 @@ import org.apache.spark.util.random.XORShiftRandom */ private[recommendation] trait ALSModelParams extends Params with HasPredictionCol { /** - * Param for the column name for user ids. + * Param for the column name for user ids. Ids must be integers. Other + * numeric types are supported for this column, but will be cast to integers as long as they + * fall within the integer value range. * Default: "user" * @group param */ - val userCol = new Param[String](this, "userCol", "column name for user ids") + val userCol = new Param[String](this, "userCol", "column name for user ids. Must be within " + + "the integer value range.") /** @group getParam */ def getUserCol: String = $(userCol) /** - * Param for the column name for item ids. + * Param for the column name for item ids. Ids must be integers. Other + * numeric types are supported for this column, but will be cast to integers as long as they --- End diff -- cc @jkbradley
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