Github user iyounus commented on the pull request: https://github.com/apache/spark/pull/10940#issuecomment-176481784 @dbtsai I agree that the constant feature doesn't have predictive power. But, the WeightedLeastSqures just throws an `AssertionError` in `lapack.dpotrs` (https://issues.apache.org/jira/browse/SPARK-11918), whereas the "l-bfgs" solver sets the coefficient to zero.
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