Github user mengxr commented on the pull request:
https://github.com/apache/spark/pull/9252#issuecomment-150607991
@dahlem Any issue with float precision? The ratings do not have high
precision anyway. Changing it to double precision increases the shuffle size by
a lot. If you want to make the `RegressionEvaluator` work with `ALS`, you can
cast the label type to Double in `RegressionEvaluator`.
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