Github user rnowling commented on the pull request:
https://github.com/apache/spark/pull/1964#issuecomment-52924889
@erikerlandson Breeze uses non-JVM data structures so it can use BLAS. The
malloc and copying could be both expensive and lead to 2-3x higher memory usage.
This may be an artifact of the MLlib vector API and may be outside the
scope of this issue.
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