Github user yanboliang commented on the issue:
https://github.com/apache/spark/pull/17867
@srowen These methods were deprecated when 2.1 releasing, and we usually
remove methods deprecated in last feature/minor release (when 2.1 releasing, we
remove methods deprecated in 2.0, see #15913). We only remove the setter
methods from the trait, which cause them be remove from the model classes who
extend them. Since it does not make sense to have it in the model classes, and
actually we never use them and mark them deprecated for one minor release
cycle. You can refer the discussion
[here](https://github.com/apache/spark/pull/15913#discussion_r89662469) .
Thanks.
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