Github user yinxusen commented on the pull request: https://github.com/apache/spark/pull/11683#issuecomment-195858851 @jkbradley @yanboliang In this PR Pipeline and PipelineModel are kept with Python implementations. However, 2 bad things are 1. It's hard to handle the scenario that Pipeline and PipelineModel themselves are used as stages. 2. I have to add a public PipelineModel constructor to generate Scala PipelineModel in Python side. I'll close the previous PR: https://github.com/apache/spark/pull/11266
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