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https://issues.apache.org/jira/browse/SPARK-17137?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15941106#comment-15941106
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DB Tsai commented on SPARK-17137:
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Ping! SPARK-17471 is merged. Anyone interested in making this by 2.2.0 release?
> 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
> Priority: Minor
>
> 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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