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https://issues.apache.org/jira/browse/SPARK-12375?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16222566#comment-16222566
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Apache Spark commented on SPARK-12375:
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User 'WeichenXu123' has created a pull request for this issue:
https://github.com/apache/spark/pull/19588
> VectorIndexer: allow unknown categories
> ---------------------------------------
>
> Key: SPARK-12375
> URL: https://issues.apache.org/jira/browse/SPARK-12375
> Project: Spark
> Issue Type: Sub-task
> Components: ML
> Reporter: Joseph K. Bradley
> Assignee: yuhao yang
>
> Add option for allowing unknown categories, probably via a parameter like
> "allowUnknownCategories."
> If true, then handle unknown categories during transform by assigning them to
> an extra category index.
> The API should resemble the API used for StringIndexer.
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