Github user yanboliang commented on a diff in the pull request: https://github.com/apache/spark/pull/11486#discussion_r56619866 --- Diff: mllib/src/main/scala/org/apache/spark/ml/feature/RFormula.scala --- @@ -248,6 +248,18 @@ class RFormulaModel private[feature]( !columnNames.contains($(labelCol)) || schema($(labelCol)).dataType == DoubleType, "Label column already exists and is not of type DoubleType.") } + + /** + * Get the original array of labels if exists. + */ + private[ml] def getOriginalLabels: Option[Array[String]] = { --- End diff -- Should we add a ```IndexToString``` transformer at the end of the ```PipelineModel```? I think it would be more general. Other functions such as ```glm``` with "binomial" family should also do the same work.
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