Github user Lewuathe commented on the pull request:
https://github.com/apache/spark/pull/3637#issuecomment-66415498
My initial question was based on the viewpoint of developer api.
Simple api seems to restrict the possibility of implementation of new
algorithm. As @shivaram mentioned, developer cannot use optimization api
because these datatypes does not support simply multi classification etc. So I
think typed interface does not necessarily be public in this context. If you
have different viewpoint such as end user of this api, that opinion should be
included on this discussion.
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