zhengruifeng opened a new pull request #27059: [SPARK-30398][ML] PCA/RegressionMetrics/RowMatrix avoid unnecessary computation URL: https://github.com/apache/spark/pull/27059 ### What changes were proposed in this pull request? use `.ml.Summarizer` instead of `.mllib.MultivariateOnlineSummarizer` to avoid computation of unused metrics ### Why are the changes needed? to avoid computation of unused metrics ### Does this PR introduce any user-facing change? No ### How was this patch tested? existing testsuites
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