Github user sethah commented on the pull request:
https://github.com/apache/spark/pull/10270#issuecomment-175302328
This approach only copies shared params like `HasFeatureCol` through class
inheritance. Parameters defined in the actual model itself are not copied, so
this patch won't mimic the scala side exactly. For example, the `NaiveBayes`
smoothing parameter is not copied to the Naive Bayes model. It seems like we
should copy all params from estimator to model, not just shared ones. Doing so
likely requires manually copying those parameters through the model constructor
or similar approach. The other approach proposed by @jkbradley in [the
jira](https://issues.apache.org/jira/browse/SPARK-10931) is to override
`getattr` but has the problem of not generating docs.
I like the latter approach but the lack of doc generation may be a deal
breaker. cc @holdenk
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