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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