Github user yinxusen commented on the issue:
https://github.com/apache/spark/pull/13794
@jkbradley For
[SPARK-15574](https://issues.apache.org/jira/browse/SPARK-15574), only Pipeline
and Transformer are changed in this PR. I will add Estimator/Model later.
For pure Python transformers, I have to add a `transformSchema`, otherwise
it fails in Scala Pipeline schema check.
For saving/loading in pure Python transformers, I think we can either
saving/loading them from Python side or serializing and shipping them to Scala
side for saving/loading.
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