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https://issues.apache.org/jira/browse/MAHOUT-1080?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13463626#comment-13463626
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Paritosh Ranjan commented on MAHOUT-1080:
-----------------------------------------

The vectors can be wrapped around NamedVectors with id as the name to trace 
them back, which solves the problem explained.

So, I am not sure whether this fix should be applied or not.
                
> Kmeans clustered output losses vectorId given in the input
> ----------------------------------------------------------
>
>                 Key: MAHOUT-1080
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-1080
>             Project: Mahout
>          Issue Type: Improvement
>          Components: Clustering
>            Reporter: Smita Wadhwa
>         Attachments: kMeansClusterVectorId.diff
>
>
> The input to the Kmeans is Intwritable and vectorWritable 
> and the output of clustered points is clusterId 
> WeightedVectorWitable(vector,distance-from-the-centre)
> The information the id of the vector is lost in this processing . 

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