Github user debasish83 commented on the pull request:
https://github.com/apache/spark/pull/5005#issuecomment-90942562
@tmyklebu do you have the original NNLS paper in english ? Breeze also has
a linear CG...I am thinking if it is possible to merge simple projections like
positivity and bounds with the linear CG...CG based linear solves can be
extended to handle projection similar to SPG...But NNLS looks like does some
specific optimization for x >= 0...can NNLS be extended to other
projection/proximal operators ?
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