zhengruifeng commented on issue #26393: [SPARK-29751][ML] Scalers use Summarizer instead of MultivariateOnlineSummarizer URL: https://github.com/apache/spark/pull/26393#issuecomment-549694050 IIRC, when `Summarizer` was created, I had done similar tests, and at that time `Summarizer` was much slower than `MultivariateOnlineSummarizer`. I am surprised by the results and will look for whether it works in other places.
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