Github user jkbradley commented on the issue:
https://github.com/apache/spark/pull/15788
I agree that R makes it much easier to convert back to the string label.
My main worries are:
* changing the API, which may break some user code
* hiding probabilities from R users (since I'd expect many would want to
analyze the probabilities)
One alternative would be to output both the string prediction and the
probability as 2 columns, which would make the SparkR API a little closer to
the other language APIs.
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