Github user felixcheung commented on a diff in the pull request:
https://github.com/apache/spark/pull/17967#discussion_r116387686
--- 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 --
should it be capitalize `"How`?
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