Github user iyounus commented on the pull request:
https://github.com/apache/spark/pull/10702#issuecomment-173738254
I've added an exception for the case when label is constant and
`standardization == true` and `regParam != 0.0`. Also added test for this case.
I cannot test the case when `standardizeLabel = false` with non-zero
`regParam` against analytic normal equation solution, because the analytic
normal equation gives me quite different results.
Even for the case when `regParam=0` and `fitIntercept=false`, the results
from normal equation are slightly different from `glmnet` and `spark`. Please
see my detailed comment regarding this comparison at
https://github.com/apache/spark/pull/10274.
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