Github user hhbyyh commented on the issue:
https://github.com/apache/spark/pull/19565
Let me know if I missed anything, but I don't quite catch the part
> all the batches have the same length
IMO
`docs.sample(withReplacement = sampleWithReplacement, miniBatchFraction,
randomGenerator.nextLong())` does not return the same number of documents
during multiple function calls.
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