Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/1393#issuecomment-49203419
@mateiz I think it would mean mostly cloning `ALS.scala`, as the `Rating`
object is woven throughout. Probably some large chunks could be refactored and
shared. Is that what you mean? even I'm not sure if two APIs are worth the
trouble. When I get to this point and see what it takes to make a 64-bit key
implementation, yes I can propose what that looks like.
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