Github user srowen commented on the pull request:
https://github.com/apache/incubator-spark/pull/575#issuecomment-35447529
For what it's worth, I like the idea of using breeze, even though I know
little about it. Mostly, I like the idea of using something consistent most of
all, and fast second, and for me that need not be commons math.
I am all too aware of how tidy abstractions in a library like this can add
killer runtime overhead. I am doubly worried in Scala (not necessarily because
of implicits). At the same time, looks like breeze does a fine job already at
making things fast where they count.
As an aside @fommil, while I don't have love for some of the ASF
bike-shedding over license stuff, their assertion is that the LGPL is
incompatible with AL2 (http://www.apache.org/legal/resolved.html#category-x),
not just something ASF dislikes. (Your interpretations may vary; but hey that's
Apache's and it's coherent.) AL2 indeed is supposed to empower the end user
more than developer, and in some cases that's the right thing. In any event the
AL2 is a faît acoompli for *Apache* Spark.
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