Github user hhbyyh commented on the pull request: https://github.com/apache/spark/pull/7084#issuecomment-117860374 Yes that's the plan (an estimator). And I know jkbradley has a similar implementation in LDA example. If Joseph is interested in migrating it here ( perhaps another jira) , we can keep the scope of this to transformer only. Any way, I think the constructor for passing in a vocabulary is useful.
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