Github user yinxusen commented on the pull request:
https://github.com/apache/spark/pull/11486#issuecomment-198870531
@mengxr @yanboliang Since the `ml.NaiveBayes` making the assumption that
its input data's label is 0-based indices, we should add a `StringIndexer` for
labels after `RFormula` if the input data's label column is not a string column
because the `RFormula` doesn't handle numerical labels. Now we can extract
labels from the final `IndexToString`.
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