Github user feynmanliang commented on the pull request:
https://github.com/apache/spark/pull/7884#issuecomment-135137091
Since `instances : RDD[(Double, Vector)]` is effectively processed as
`RDD[(Double, 1.0, Vector)]` (due to default params / method aliases for
`add`), I wonder if we can just map `instances` into a `RDD[(Double, 1.0,
Vector)]` `if $(weightCol).isEmpty` and avoid using the `Either`s throughout
the code. This will add an additional pass, but I think it should be negligible
compared to the optimizer time.
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