Github user mengxr commented on the pull request:
https://github.com/apache/spark/pull/2491#issuecomment-57865710
@staple The conditional distribution matrix may not be sparse. That is why
we use dense format to store it. Maybe we can do a hard thresholding to make it
parse, but this should be in a separate PR. Let's focus on the second and the
third in this PR.
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