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https://issues.apache.org/jira/browse/SPARK-17137?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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DB Tsai resolved SPARK-17137.
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Resolution: Fixed
Fix Version/s: 2.2.0
Issue resolved by pull request 17426
[https://github.com/apache/spark/pull/17426]
> Add compressed support for multinomial logistic regression coefficients
> -----------------------------------------------------------------------
>
> Key: SPARK-17137
> URL: https://issues.apache.org/jira/browse/SPARK-17137
> Project: Spark
> Issue Type: Sub-task
> Components: ML
> Reporter: Seth Hendrickson
> Assignee: Seth Hendrickson
> Priority: Minor
> Fix For: 2.2.0
>
>
> For sparse coefficients in MLOR, such as when high L1 regularization, it may
> be more efficient to store coefficients in compressed format. We can add this
> option to MLOR and perhaps to do some performance tests to verify
> improvements.
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