Github user jkbradley commented on the pull request:
https://github.com/apache/spark/pull/6339#issuecomment-128130195
It's failing because invert is only in StringIndexer, not
StringIndexerModel.
That's a good point though; we should probably add invert() to
StringIndexerModel as well. @holdenk Would you mind sending a quick PR to do
that? Thanks!
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