Github user itg-abby commented on the issue:
https://github.com/apache/spark/pull/15496
@holdenk
Thanks for the review and your availability, I really appreciate the work
you are doing too by mentoring me! I didn't realize np.append was making
copies, though it made a lot of sense once I thought about what is actually
going on there in terms of memory.
The appends were also ultimately unnecessary and have been removed in favor
of a much better, simpler, efficient call to make the csr matrix!
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