Github user mengxr commented on the pull request:
https://github.com/apache/spark/pull/1624#issuecomment-50704107
@miccagiann For `regType`, I think people are more familiar with `l1` and
`l2` than `L1Updater` and `SquaredUpdater`. Do you mind changing them?
Lowercase names are preferred because we use lowercase method names in other
places.
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