[jira] [Commented] (SPARK-15957) RFormula supports forcing to index label

["Apache Spark (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-15957?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15564876#comment-15564876 ] 

Apache Spark commented on SPARK-15957:
--------------------------------------

User 'yanboliang' has created a pull request for this issue:
https://github.com/apache/spark/pull/15430

> RFormula supports forcing to index label
> ----------------------------------------
>
>                 Key: SPARK-15957
>                 URL: https://issues.apache.org/jira/browse/SPARK-15957
>             Project: Spark
>          Issue Type: Improvement
>          Components: ML
>            Reporter: Yanbo Liang
>            Assignee: Yanbo Liang
>             Fix For: 2.1.0
>
>
> RFormula will index label only when it is string type currently. If the label is numeric type and we use RFormula to present a classification model, there is no label attributes in label column metadata. The label attributes are useful when making prediction for classification, so we can force to index label by {{StringIndexer}} whether it is numeric or string type for classification. Then SparkR wrappers can extract label attributes from label column metadata successfully. This feature can help us to fix bug similar with SPARK-15153.
> For regression, we will still to keep label as numeric type.
> In this PR, we add a param indexLabel to control whether to force to index label for RFormula.



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