Github user zhengruifeng commented on the issue: https://github.com/apache/spark/pull/15435 It seems that many metrics in `MultinomialLogisticRegressionSummary` are generic to other classification algos. So what about create a new class `MultiClassificationSummary` and put it in a new file? Just like what @yanboliang does in https://github.com/apache/spark/pull/15555
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