Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/11322#issuecomment-188787972
I asked around and couldn't find anyone who had heard of this metric being
used -- except for the examples you cite in Kaggle. Since it's quite easy to
implement yourself for these cases, I'd suggest it's not worth including. The
downside is simply a little extra weight in the API for little-r gain. We can
revive it later if someone has evidence to the contrary. Would you close this
PR?
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