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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