Github user sethah commented on a diff in the pull request: https://github.com/apache/spark/pull/19638#discussion_r148662710 --- Diff: mllib/src/main/scala/org/apache/spark/mllib/stat/MultivariateOnlineSummarizer.scala --- @@ -230,6 +230,13 @@ class MultivariateOnlineSummarizer extends MultivariateStatisticalSummary with S override def count: Long = totalCnt /** + * Number of parameters + * + */ + @Since("2.3.0") + override def numParam: Int = n --- End diff -- Hmmm... no this isn't right. When this is used with regression metrics, the summary is of dimension 2 always since the `predictionsAndObservations` is just an rdd of (prediction, label) pairs. The unit tests weren't thorough enough to catch it.
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