Github user mengxr commented on the pull request:
https://github.com/apache/spark/pull/6595#issuecomment-108204925
I checked the transformers we have. Perhaps this is the only one that would
operate on target labels, and it is blocking users from making predictions
without labels. So it would be nice to merge this fix into branch-1.4, before
1.4.1 is out.
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