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https://issues.apache.org/jira/browse/SPARK-20502?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16011768#comment-16011768
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Joseph K. Bradley commented on SPARK-20502:
-------------------------------------------

Thanks for doing this audit!  Note that the list includes some items which are 
actually package private.  I largely agree with you about not making changes 
right now.  We could arguably make some more things non-Experimental, but 
really, I'd prefer to leave them as-is for this release.  Some of the main 
items:
* Summaries: I wonder if we should keep these Experimental b/c of future 
extensions, for which we'd want to make these final.
* Keep Evaluators Experimental b/c of ongoing discussions about supporting 
multiple metrics, etc.
* Keep RFormula Experimental b/c of existing differences from R which may 
require behavior changes to fix

I'll mark this as done, but others can comment if they disagree.  Thanks 
[~yuhaoyan]!

> ML, Graph 2.2 QA: API: Experimental, DeveloperApi, final, sealed audit
> ----------------------------------------------------------------------
>
>                 Key: SPARK-20502
>                 URL: https://issues.apache.org/jira/browse/SPARK-20502
>             Project: Spark
>          Issue Type: Sub-task
>          Components: Documentation, GraphX, ML, MLlib
>            Reporter: Joseph K. Bradley
>            Assignee: yuhao yang
>            Priority: Blocker
>             Fix For: 2.2.0
>
>
> We should make a pass through the items marked as Experimental or 
> DeveloperApi and see if any are stable enough to be unmarked.
> We should also check for items marked final or sealed to see if they are 
> stable enough to be opened up as APIs.



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