Github user mengxr commented on the pull request:

    https://github.com/apache/spark/pull/3307#issuecomment-63405418
  
    You can set it through via the `optimizer.setUpdater`. It may not work well 
for L1, but I want to reserve that position even we only support `None` and 
`l2` at this time to be consistent with `LRWithSGD`. It will be awkward to 
append `regType` to the end of the list if we want to add it in the future. 
This is why I'd like to enforce named arguments.


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