Github user yinxusen commented on the pull request:
https://github.com/apache/spark/pull/11683#issuecomment-196495577
I think it's better to call save/load from Scala side because we want
consistency between Scala/Python implementations. We need to guarantee the
model and the pipeline saved by Python/Scala should be loaded via Scala/Python,
respectively.
Yes we can implement the pipeline persistence in Python side, but it need
more work to keep the consistency.
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