Github user Lewuathe commented on the pull request:
https://github.com/apache/spark/pull/3975#issuecomment-71455512
@mengxr @jkbradley Thank you for suggestive advices. Anyway
`loadLibSVMFile` should not be changed and in this case the problem is occurred
by negative label in `Impurity`. So I update `Impurity` to throw exception.
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