Github user mridulm commented on the pull request:
https://github.com/apache/spark/pull/506#issuecomment-41144433
Might be a good idea to move this out of mllib and push this into core
itself.
The utility of this PR seems more fundamental than just for ML (assuming it
does something analogous to all reduce in mpi - note, I am yet to go through
this in detail :-) ).
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