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https://issues.apache.org/jira/browse/SPARK-6965?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14517700#comment-14517700
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Apache Spark commented on SPARK-6965:
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User 'mengxr' has created a pull request for this issue:
https://github.com/apache/spark/pull/5753
> StringIndexer should convert input to Strings
> ---------------------------------------------
>
> Key: SPARK-6965
> URL: https://issues.apache.org/jira/browse/SPARK-6965
> Project: Spark
> Issue Type: Improvement
> Components: ML
> Affects Versions: 1.4.0
> Reporter: Joseph K. Bradley
> Assignee: Xiangrui Meng
> Priority: Minor
>
> StringIndexer should convert non-String input types to String. That way, it
> can handle any basic types such as Int, Double, etc.
> It can convert any input type to strings first and store the string labels
> (instead of an arbitrary type). That will simplify model export/import.
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