Github user karlhigley commented on the pull request:
https://github.com/apache/spark/pull/304#issuecomment-48093398
This looked useful, so I tried it out. It works as expected so long as the
feature array is an `Array[Any]`. If the features are all categorical, then
the feature array could be an `Array[String]`. In that case, `encodeVec` will
instantiate an `Array[String]` for `outVec`, which results in an exception on
line 125, because `Array[String]` won't accept an integer value.
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