Github user jkbradley commented on the pull request:
https://github.com/apache/spark/pull/9916#issuecomment-190965496
@ehsanmok Sorry for the delay. Could you please add a to-do in the code
for using zero matrices more efficiently? Other than that, it looks fine.
Would you be interested in submitting a PR to Breeze to add a primitive for
subtracting a DenseMatrix and CSCMatrix? If you can, please CC me on the PR,
and I can help review it. Thanks!
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