Github user zhengruifeng commented on the issue:
https://github.com/apache/spark/pull/15314
@sethah @srowen I think we can firstly work on this PR to support weightCol
numeric types and by the way fix the bug in LabelCol.
And then, open another jira to discuss whether cast weightCol and labelCol
in `Predictor` or not.
I agree with sethah's inclination that casting should be a commen method
and each algo only need to deal with `DoubleType`.
What's your opinion?
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