Github user actuaryzhang commented on the issue: https://github.com/apache/spark/pull/16344 @srowen Thanks for the comments. Makes lots of sense to move the switch to subclass. I did not know one could override a `val`. In the new commit, I have moved the `defaultLink` and `aic` to subclasses. I also added back `name` in the constructor. The other methods `initialize`, `variance`, `deviance` and `project` are common and thus implemented in the `TweedieFamily` parent class. Hope this makes sense.
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