Github user debasish83 commented on the pull request:
https://github.com/apache/spark/pull/5005#issuecomment-79747931
@mengxr thanks I got the idea....updateGram should always keep lower
triangular/upper triangular memory and we directly drop down to lapack to do
the solve...It will improve the runtime of QuadraticMinimizer default as well
as all other formulations...Let me add it...For NNLS I am not sure if this
optimization holds since it is doing gradient based CG calls...Let's think on it
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