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

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

Joseph K. Bradley created SPARK-7126:
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             Summary: 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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