Github user myui commented on the issue:
https://github.com/apache/incubator-hivemall/pull/79
@takuti better to have this kind of documents.
http://spark.apache.org/docs/latest/mllib-optimization.html
http://scikit-learn.org/stable/modules/sgd.html#mathematical-formulation
BTW refer [1,2] for how Spark/scikit incorporates regularized updates. FYI
[1]
https://github.com/apache/spark/blob/f830bb9170f6b853565d9dd30ca7418b93a54fe3/mllib/src/main/scala/org/apache/spark/mllib/optimization/Updater.scala
[2]
https://github.com/scikit-learn/scikit-learn/blob/master/sklearn/linear_model/sgd_fast.pyx#L632
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