Github user mengxr commented on the pull request:
https://github.com/apache/spark/pull/3468#issuecomment-64526447
@brkyvz `XORShiftRandom` implements `Random`. So users can use it directly.
Using seed will create problems when we want to generate a sequence of
matrices, e.g., generate a random block matrices, because `randn` and `rand` do
not return the next seed. If we using a predefined sequence of seeds, the
generated sequence won't have good quality.
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