Github user mengxr commented on the pull request:
https://github.com/apache/spark/pull/1518#issuecomment-50441485
@dbtsai I thought another way to do this and want to know your opinion. We
can add an optional argument to `appendBias`: `appendBias(bias: Double = 1.0)`.
If this is used in adding intercept, we can add a large bias so the
corresponding weight gets less regularized.
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