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https://issues.apache.org/jira/browse/SPARK-17137?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15941114#comment-15941114
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Seth Hendrickson commented on SPARK-17137:
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I can make a PR for using this inside the MLOR code, but I probably won't have 
time to do performance tests within the next couple of days (since code freeze 
has already passed). [~dbtsai] Do you think we need to do performance tests 
before this patch goes in? 

> 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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