Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/9565#discussion_r58844750
--- Diff: mllib/src/main/scala/org/apache/spark/ml/Transformer.scala ---
@@ -90,7 +90,7 @@ abstract class UnaryTransformer[IN, OUT, T <:
UnaryTransformer[IN, OUT, T]]
* account of the embedded param map. So the param values should be
determined solely by the input
* param map.
*/
- protected def createTransformFunc: IN => OUT
+ protected val createTransformFunc: (T, IN) => OUT
--- End diff --
The UDF obtained with `def createTransformFunc` can't work with runtime
mirror. I tried many times. Only make it as a `val` can work.
As `Transformer` can update its params, we need to pass in `T` to UDF to
get the updated params.
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