srowen commented on issue #24727: [SPARK-27867][ML] RegressionEvaluator cache lastest RegressionMetrics to avoid duplicated computation URL: https://github.com/apache/spark/pull/24727#issuecomment-496946434 Yeah, that's pretty much the design of all of these evaluators, for better or worse. I wouldn't make this change though. A caller could use RegressionMetrics directly if desired, but that would be going outside the Evaluator interface. I don't see a clean way to expose N metrics at once, because Evaluators inherently produce one metric.
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