zhengruifeng commented on issue #26679: [SPARK-30044][ML] MNB/CNB/BNB use empty sigma matrix instead of null URL: https://github.com/apache/spark/pull/26679#issuecomment-560203448 @srowen eh, the improvement is small: 1, we do not need to check `sigma==null` in model saving and loading 2, in the py side, the `sigma` is alwasys a matrix; while in the previous version, it is `None` when `modelType` is not `gaussian`. Since you do not object, I will merge it these days.
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