Github user holdenk commented on the pull request: https://github.com/apache/spark/pull/10788#issuecomment-172233210 Also related is https://github.com/apache/spark/pull/6771 which avoids the round trip through DataFrames (although since it now works on Instances rather than LabeledPoints under the hood it got a bit more complicated) so its probably OK to have the round trip (but just to keep as an option).
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