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https://issues.apache.org/jira/browse/SPARK-9977?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14697104#comment-14697104
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Apache Spark commented on SPARK-9977:
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User 'Lewuathe' has created a pull request for this issue:
https://github.com/apache/spark/pull/8205
> The usage of a label generated by StringIndexer
> -----------------------------------------------
>
> Key: SPARK-9977
> URL: https://issues.apache.org/jira/browse/SPARK-9977
> Project: Spark
> Issue Type: Improvement
> Components: Documentation
> Affects Versions: 1.4.1
> Reporter: Kai Sasaki
> Priority: Trivial
> Labels: documentaion
>
> By using {{StringIndexer}}, we can obtain indexed label on new column. So a
> following estimator should use this new column through pipeline if it wants
> to use string indexed label.
> I think it is better to make it explicit on documentation.
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