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https://issues.apache.org/jira/browse/SPARK-3147?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14544925#comment-14544925
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Joseph K. Bradley commented on SPARK-3147:
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Thanks for pointing this out.  [~fliang] I'm sorry, but I don't think we'll be 
able to get this into 1.4.  I'm sure we'll be able to go for 1.5, though; we 
can try to get it merged early during this next release cycle.

> Implement A/B testing
> ---------------------
>
>                 Key: SPARK-3147
>                 URL: https://issues.apache.org/jira/browse/SPARK-3147
>             Project: Spark
>          Issue Type: New Feature
>          Components: MLlib, Streaming
>            Reporter: Xiangrui Meng
>            Assignee: Feynman Liang
>
> A/B testing is widely used to compare online models. We can implement A/B 
> testing in MLlib and integrate it with Spark Streaming. For example, we have 
> a PairDStream[String, Double], whose keys are model ids and values are 
> observations (click or not, or revenue associated with the event). With A/B 
> testing, we can tell whether one model is significantly better than another 
> at a certain time. There are some caveats. For example, we should avoid 
> multiple testing and support A/A testing as a sanity check.  



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