Github user dbtsai commented on the issue:
https://github.com/apache/spark/pull/13796
The solution of this overparameterized problem in the link is just adding
the regularization, and users may not want it. I think we need to optimize it
on (k-1) parameters, and then put the final or the first one back by centering
the intercepts and weights. @sethah could you have a JIRA to track this issue?
Thanks.
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