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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