zhengruifeng opened a new pull request #26596: [SPARK-29959][ML][PYSPARK] Summarizer support more metrics URL: https://github.com/apache/spark/pull/26596 ### What changes were proposed in this pull request? Summarizer support more metrics: sum, sumL2, weightSum, numFeatures, std ### Why are the changes needed? Those metrics are widely used, it will be convenient to directly obtain them other than a conversion. in `NaiveBayes`: we want the sum of vectors, mean & weightSum need to computed then multiplied in `StandardScaler`,`AFTSurvivalRegression`,`LinearRegression`,`LinearSVC`,`LogisticRegression`: we need to obtain `variance` and then sqrt it to get std ### Does this PR introduce any user-facing change? yes, new metrics are exposed to end users ### How was this patch tested? added testsuites
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