Github user mengxr commented on the pull request:
https://github.com/apache/spark/pull/3975#issuecomment-71419431
@Lewuathe I'm suggesting the following:
1) loadLibSVMFile should not transform the input data.
2) Users should map the labels to 0, 1, 2, 3, ...
a) using ad-hoc transformations,
b) or using a `LabelIndexer` (to be added) in the new pipeline API, where
metadata will be added to the output column of `LabelIndexer`
3) Algorithms should validate the label values and throw errors if they are
out of range
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