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https://issues.apache.org/jira/browse/SPARK-17498?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16390777#comment-16390777
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Haopu Wang commented on SPARK-17498:
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After this fix, the reverse transformation "IndexToString" still complains
"Unseen index: 3.0 ??" for the indexes of unseen labels, any idea to fix it?
> 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
> Assignee: Vincent
> Priority: Minor
> Fix For: 2.2.0
>
>
> 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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