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From "Suneel Marthi (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAHOUT-1217) Nearest neighbor searchers sometimes fail to remove points
Date Thu, 16 May 2013 18:59:17 GMT

    [ https://issues.apache.org/jira/browse/MAHOUT-1217?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13659829#comment-13659829
] 

Suneel Marthi commented on MAHOUT-1217:
---------------------------------------

a) This issue is not related to the Distance Measure that's being used.
b) It only happens in FastProjection Search, works fine with Projection Search. I suspect
its got to do with the Array sort that's happening in FastProjection Search.
                
> Nearest neighbor searchers sometimes fail to remove points
> ----------------------------------------------------------
>
>                 Key: MAHOUT-1217
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-1217
>             Project: Mahout
>          Issue Type: Bug
>          Components: Math
>    Affects Versions: 0.8
>            Reporter: Dan Filimon
>
> When updating a Centroid in StreamingKMeans, the Centroid needs to be removed and its
updated version added.
> When removing points in a searcher that are already there, sometimes the searcher fails
to return the closest point (the one being searched for) causing a RuntimeException.
> This has been observed for TF-IDF vectors with SquaredEuclideanDistance and CosineDistance
and FastProjectionSearch.

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