Github user actuaryzhang commented on a diff in the pull request: https://github.com/apache/spark/pull/17967#discussion_r116389971 --- Diff: mllib/src/main/scala/org/apache/spark/ml/feature/RFormula.scala --- @@ -37,6 +37,29 @@ import org.apache.spark.sql.types._ */ private[feature] trait RFormulaBase extends HasFeaturesCol with HasLabelCol { + /** + * Param for how to order labels of string column. The first label after ordering is assigned + * an index of 0. + * Options are: + * - 'frequencyDesc': descending order by label frequency (most frequent label assigned 0) + * - 'frequencyAsc': ascending order by label frequency (least frequent label assigned 0) + * - 'alphabetDesc': descending alphabetical order + * - 'alphabetAsc': ascending alphabetical order + * Default is 'frequencyDesc'. + * + * @group param + */ + @Since("2.3.0") + final val stringOrderType: Param[String] = new Param(this, "stringOrderType", + "how to order labels of string column. " + --- End diff -- Fixed it, thanks!
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