Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/17967#discussion_r117409633
--- 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
--- End diff --
Should we add a comment explaining which option is consistent with R?
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