Github user debasish83 commented on the pull request:
https://github.com/apache/spark/pull/5005#issuecomment-79250025
Also quadraticMinimizer keeps it's own workspace...The idea is to construct
ALS.QuadraticSolver once and keep re-using it..this is specially useful for LSA
constraints...For ALS.NNLSSolver workspace is still maintained by ALS...Let me
do the comparisons with CholeskySolver first and report the results...
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