Github user MLnick commented on a diff in the pull request:
https://github.com/apache/spark/pull/12461#discussion_r60022981
--- Diff:
mllib/src/main/scala/org/apache/spark/mllib/evaluation/RankingMetrics.scala ---
@@ -156,6 +156,32 @@ class RankingMetrics[T: ClassTag](predictionAndLabels:
RDD[(Array[T], Array[T])]
}.mean()
}
+ /**
+ * Returns the mean reciprocal rank (MRR) of all the queries.
--- End diff --
It would be good to expand the doc string here with more detail about what
is MRR and how it is computed (see the `ndcg` doc string above).
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