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https://issues.apache.org/jira/browse/SPARK-7000?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14512828#comment-14512828
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Joseph K. Bradley commented on SPARK-7000:
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Decision after conferring with [~mengxr]:  The structure will be:
* ml.Predictor (Predictor will be made public and moved to the ml package in 
[SPARK-5995])
* ml.trees.* (Tree abstractions shared by ml.classification and ml.regression)
* ml.ensembles.* (Generic ensemble abstractions shared by ml.classification and 
ml.regression)

Since we can't think of more shared abstractions currently, we'll aim for a 
flatter directory structure.  Closing this JIRA

> spark.ml Prediction abstractions should reside in ml.prediction subpackage
> --------------------------------------------------------------------------
>
>                 Key: SPARK-7000
>                 URL: https://issues.apache.org/jira/browse/SPARK-7000
>             Project: Spark
>          Issue Type: Improvement
>          Components: ML
>    Affects Versions: 1.3.1
>            Reporter: Joseph K. Bradley
>            Assignee: Joseph K. Bradley
>            Priority: Minor
>
> spark.ml prediction abstractions are currently not gathered; they are in both 
> ml.impl and ml.tree.  Instead, they should be gathered into ml.prediction.  
> This will become more important as more abstractions, such as ensembles, are 
> added.



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