Github user mengxr commented on the pull request:
https://github.com/apache/spark/pull/3729#issuecomment-67601970
Had an offline discussion with @witgo . The current implementation takes
advantage of Parquet's serialization over Java's. However, this is too special
for this particular algorithm. I asked @witgo to check the implementation of
gap sampling and see how to apply it to min-batch sampling.
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