I am working right now with the ML pipeline, which I really like it.
However in order to make a real use of it, I would like create my own
transformers that implements org.apache.spark.ml.Transformer. In order to
do that, a method from the PipelineStage needs to be implemented. But this
method is private to the ml package:

private[ml] def transformSchema(schema: StructType, paramMap: ParamMap):
StructType

Do any user can create their own transformers? If not, do this
functionality will be added in the future.

Thanks
-- 
Cesar Flores

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