Github user debasish83 commented on the pull request:
https://github.com/apache/spark/pull/3221#issuecomment-84766375
Also for the ml.QuadraticSolver vs ml.CholeskySolver first iteration
runtime difference I am considering opening up an API in Breeze
QuadraticMinimizer which only uses half of the workspace for cholesky systems
and full workspace for quasi definite systems...
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