Github user erikerlandson commented on the pull request:
https://github.com/apache/spark/pull/1964#issuecomment-52857232
Looking at the conversion code between spark vectors and breeze vectors,
conversions seem reasonably inexpensive, as they are just exchanging their
underlying data members. It might be nice to migrate to using all breeze
vectors instead of a mixture of spark and breeze, although that would be
outside the scope of this issue.
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