Github user yinxusen commented on the pull request:
https://github.com/apache/spark/pull/11266#issuecomment-192038248
Implementing Pipeline with its Scala companion helps keep consistency
between Scala and Python sides. The Pipeline in Scala side may evolve many
times, it's easy to maintenance the Python interface in such scenario. In this
PR, I only add two more functions: `_transfer_stages_to/from_java`. And I think
this is also useful later when we want to port warm-start interfaces to Python
side.
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