Github user mengxr commented on the pull request:
https://github.com/apache/spark/pull/2667#issuecomment-58320921
@srowen Ranking metrics are different from multiclass metrics. In general,
multiclass metrics do not consider the ordering of the predictions, but just
hits and misses, and they don't truncate the result. Ranking metrics consider
the ordering of predictions, applying discounts and truncating the result. I
think they are two sets of evaluation metrics.
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