Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/12420#discussion_r89698708
--- Diff: mllib/src/main/scala/org/apache/spark/ml/Pipeline.scala ---
@@ -111,6 +111,18 @@ class Pipeline @Since("1.4.0") (
@Since("1.2.0")
def getStages: Array[PipelineStage] = $(stages).clone()
+ /** Returns stage at index i in Pipeline */
+ @Since("2.0.0")
+ def getStage[T <: PipelineStage](i: Int): T =
getStages.apply(i).asInstanceOf[T]
+
+ /** Returns all stages of this type */
+ @Since("2.0.0")
+ def getStagesOfType[T <: PipelineStage]: Array[T] = {
+ getStages.collect {
--- End diff --
Nit: This is probably more natural as a one-liner
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