[jira] [Updated] (SPARK-7126) For spark.ml Classifiers, automatically index labels if they are not yet indexed

["Joseph K. Bradley (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-7126?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Joseph K. Bradley updated SPARK-7126:
-------------------------------------
    Target Version/s:   (was: 1.5.0)

> For spark.ml Classifiers, automatically index labels if they are not yet indexed
> --------------------------------------------------------------------------------
>
>                 Key: SPARK-7126
>                 URL: https://issues.apache.org/jira/browse/SPARK-7126
>             Project: Spark
>          Issue Type: Improvement
>          Components: ML
>    Affects Versions: 1.4.0
>            Reporter: Joseph K. Bradley
>
> Now that we have StringIndexer, we could have spark.ml.classification.Classifier (the abstraction) automatically handle label indexing if the labels are not yet indexed.
> This would require a bit of design:
> * Should predict() output the original labels or the indices?
> * How should we notify users that the labels are being automatically indexed?
> * How should we provide that index to the users?
> * If multiple parts of a Pipeline automatically index labels, what do we need to do to make sure they are consistent?



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