Github user jkbradley commented on a diff in the pull request:
https://github.com/apache/spark/pull/12420#discussion_r60479728
--- Diff: mllib/src/main/scala/org/apache/spark/ml/Pipeline.scala ---
@@ -309,6 +321,32 @@ class PipelineModel private[ml] (
@Since("1.6.0")
override def write: MLWriter = new
PipelineModel.PipelineModelWriter(this)
+
+ /** Returns stage at index i in PipelineModel */
+ @Since("2.0.0")
+ def getStage[T <: Transformer](i: Int): T = {
+ stages.apply(i).asInstanceOf[T]
+ }
+
+ /**
+ * Returns stage given its parent or generating instance in
PipelineModel.
+ * E.g., if this PipelineModel was created from a Pipeline containing a
stage
+ * {{myStage}}, then passing {{myStage}} to this method will return the
+ * corresponding stage in this PipelineModel.
+ */
+ @Since("2.0.0")
+ def getStage[T <: Transformer, E <: PipelineStage](stage: E): T = {
+ val idxInPipeline =
this.parent.asInstanceOf[Pipeline].getStages.indexOf(stage)
--- End diff --
This should test against the uid, not the stage reference.
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