Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/2313#issuecomment-54779815
> What's the behavior if some slaves have numpy but others do not have?
Yeah, this was my original concern. Do both implementations give equal
results, or will this patch lead to non-deteterministic outcomes if tasks
sometimes run with numpy and sometimes without (e.g. while recomputing failed
tasks)?
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