Github user erikerlandson commented on the pull request:
https://github.com/apache/spark/pull/1964#issuecomment-53341467
You want to use abs(vector) instead of vector.map(abs(_)):
https://gist.github.com/erikerlandson/488275019e4b54f5cdaf
With the test harness above, I am getting breeze abs results around 2x
faster, although the variance between test runs can be substantial. I'm
interested if you get comparable results running it on your environment.
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