Github user debasish83 commented on the issue: https://github.com/apache/spark/pull/458 ADMM is already implemented as part of Breeze proximal NonlinearMinimizer where the ADMM solver stays in master and gradient calculator is used in similar manner as how Breeze LBFGS/OWLQN has been plugged in...I did not open up a PR since OWLQN has been chosen for L1 logistic...
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