Github user MLnick commented on the issue:
https://github.com/apache/spark/pull/10945
I'd only say it's worth putting in if it's something that users would
cross-validate against (in which case makes more sense to put it into the `ml`
evaluator). But I don't think that's a common case, so unless we saw a lot of
user requests I'd tend to lean against it, since as you mention it's pretty
straightforward to write a small function to compute it.
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