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Apache Spark commented on SPARK-17498:
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User 'VinceShieh' has created a pull request for this issue:
https://github.com/apache/spark/pull/16883
> StringIndexer.setHandleInvalid should have another option 'new'
> ---------------------------------------------------------------
>
> Key: SPARK-17498
> URL: https://issues.apache.org/jira/browse/SPARK-17498
> Project: Spark
> Issue Type: Improvement
> Components: ML
> Reporter: Miroslav Balaz
>
> That will map unseen label to maximum known label +1, IndexToString would map that back
to "<undef>" or NA if there is something like that in spark,
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