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https://issues.apache.org/jira/browse/SPARK-3942?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen resolved SPARK-3942.
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Resolution: Won't Fix
> LogisticRegressionWithLBFGS should not use SquaredL2Updater
> ------------------------------------------------------------
>
> Key: SPARK-3942
> URL: https://issues.apache.org/jira/browse/SPARK-3942
> Project: Spark
> Issue Type: Bug
> Components: MLlib
> Affects Versions: 1.1.0
> Reporter: fuminglin
>
> LBFGS method use line search for step size, in all mllib`s updater use
> step-size decreasing with the square root of the number of iterations, this
> may cause Wolfe condition not hold.
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