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https://issues.apache.org/jira/browse/SPARK-4494?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14234091#comment-14234091
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Apache Spark commented on SPARK-4494:
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User 'yu-iskw' has created a pull request for this issue:
https://github.com/apache/spark/pull/3603
> IDFModel.transform() add support for single vector
> --------------------------------------------------
>
> Key: SPARK-4494
> URL: https://issues.apache.org/jira/browse/SPARK-4494
> Project: Spark
> Issue Type: New Feature
> Components: MLlib
> Affects Versions: 1.1.1, 1.2.0
> Reporter: Jean-Philippe Quemener
> Priority: Minor
>
> For now when using the tfidf implementation of mllib you have no other
> possibility to map your data back onto i.e. labels or ids than use a hackish
> way with ziping: {quote} 1. Persist input RDD. 2. Transform it to just
> vectors and apply IDFModel 3. zip with original RDD 4. transform label and
> new vector to LabeledPoint{quote}
> Source:[http://stackoverflow.com/questions/26897908/spark-mllib-tfidf-implementation-for-logisticregression]
> I think as in production alot of users want to map their data back to some
> identifier, it would be a good imporvement to allow using a single vector on
> IDFModel.transform()
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