Github user jodersky commented on the issue:

    https://github.com/apache/spark/pull/13729
  
    Hi @dbtsai, I assisted @sethah with some serialization issues during this 
PR. I know we considered using transient but can't recall exactly why we ended 
up not.
    My knowledge about the bigger picture of this PR is quite limited, but one 
explanation that comes to mind is that the `coefficients` and `featuresStd` 
parameters are only used within the `add` method. So the reasoning was to keep 
parameters as local as possible.


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