Github user mengxr commented on the pull request:
https://github.com/apache/spark/pull/3099#issuecomment-62595832
@shivaram Your definition is correct. Many users would be happy to see that
they can quickly assemble a pipeline without implementing new
transformers/estimators. They can focus more on their own task.
There is a trade-off here. We need more feedback from developers and learn
how we can improve the internals, but we don't want to expose APIs to reserve
the right for future changes. We chose to mark everything "alpha" to make the
message clear. I'm also okay with your suggestion: marking developer-facing
APIs `private[ml]` if possible.
@mateiz Based on the feedback from @jkbradley , @shivaram , and @etrain,
how about me removing `CrossValidator` and `Evaluator` from this PR and mark
`Transformer` and `Estimator` `prviate[ml]`?
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