Github user mateiz commented on the pull request:
https://github.com/apache/spark/pull/117#issuecomment-38321698
@mengxr I think this approach is fine, and we'll just have to change the
other algorithms to take `RDD[Vector]` for Spark 1.0. It's unfortunate that we
had to do this -- we started with `Array[Double]` thinking it's an interface we
can always support, but we didn't realize that type erasure would create this
problem. We can add a utility function to `Vectors` to create an `RDD[Vector]`
from `RDD[Array[Double]]`.
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