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https://issues.apache.org/jira/browse/SPARK-6346?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen resolved SPARK-6346.
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    Resolution: Not A Problem

> Use faster converging optimization method in MLlib
> --------------------------------------------------
>
>                 Key: SPARK-6346
>                 URL: https://issues.apache.org/jira/browse/SPARK-6346
>             Project: Spark
>          Issue Type: Improvement
>          Components: ML, MLlib
>            Reporter: Reza Zadeh
>
> According to experiments in SPARK-1503, the LBFGS algorithm converges much 
> faster than our current proximal gradient, which is used throughout MLlib. 
> This ticket is to track replacing slower-converging algorithms, with faster 
> components e.g. LBFGS
> This needs unification of the Optimization interface. For example, the LBFGS 
> implementation should not know about RDDs.



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