Github user MLnick commented on the pull request:
https://github.com/apache/spark/pull/12200#issuecomment-206724684
@wangmiao1981 the tests are ok - but I do like @BrianCutler's idea of
fitting the vectorizer first, and then building the model from that fitted
vocab - it seems slightly cleaner to me (any prevents issues if the tests input
should change in future for whatever reason).
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