zhengruifeng commented on issue #24727: [SPARK-27867][ML] RegressionEvaluator cache lastest RegressionMetrics to avoid duplicated computation URL: https://github.com/apache/spark/pull/24727#issuecomment-496792285 @srowen But current `Evaluator` do not expose method to obtain the metrics other that set by `metricName`. If we want two metrics, we have to compute twice. or we modify `Evaluator` to support `setMetricNames` and return an array?
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