Github user jkbradley commented on the pull request:
https://github.com/apache/spark/pull/7538#issuecomment-127427628
@MechCoder Thanks for the updates! I'll take a look. The issue with
multiclass is that, when we add multiclass support in the future, the current
(binary) metrics will not all be applicable to multiclass problems. That means
we'd need to return null or some bad value for certain metrics. I'd prefer to
use a type-safe approach instead of returning bad values.
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