Github user mdagost commented on the pull request:
https://github.com/apache/spark/pull/3095#issuecomment-62010165
Okay @davies. I changed `seed` to a `java.lang.Long` and did a null check,
which is a much nicer way of doing things. Thanks. So the `if` branch is gone
from the python, and the extra stub in `PythonMLLibAPI` is gone.
In terms of cleaning up the API's in `ALS.scala`, I don't know what to do
about that since I don't know what they're all for, other than the ones that I
added to deal with `nonnegative`. @mengxr?
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