Github user jkbradley commented on the issue: https://github.com/apache/spark/pull/15018 Thanks for pinging about this---it looks important! One request: Do you know if there is a resource with a clearer statement of this precise algorithm for the L2 norm? That'd be nice to have. The best I found so far was "A Fast Scaling Algorithm for Minimizing Separable Convex Functions Subject to Chain Constraints"
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