srowen commented on issue #25256: [SPARK-28514][ML] Remove the redundant transformImpl method in RF & GBT URL: https://github.com/apache/spark/pull/25256#issuecomment-516882385 I think I'd leave this, as it's on purpose and probably for performance reasons. I wonder if we can just always broadcast the model here? What's the downside? the model is already by default serialized in the closure, so it should serialize. There's overhead to broadcasting a tiny model I guess, but maybe that's fine.
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