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From "Paritosh Ranjan (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAHOUT-825) Canopies grouping records outside t1
Date Fri, 07 Oct 2011 17:03:29 GMT

    [ https://issues.apache.org/jira/browse/MAHOUT-825?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13122962#comment-13122962
] 

Paritosh Ranjan commented on MAHOUT-825:
----------------------------------------

hmmm, applying it in Canopy generation phasethat was an experiment ( as you can see from previous
posts ). I can remove that.

I don't need to compute parameters if I remove it from Canopy generation phase ( which was
anyway an experiment ).

Then we will simply use the radius, which is already calculated ( and not t1 ).

                
> Canopies grouping records outside t1
> ------------------------------------
>
>                 Key: MAHOUT-825
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-825
>             Project: Mahout
>          Issue Type: Bug
>          Components: Clustering
>    Affects Versions: 0.6
>         Environment: windows, linux
>            Reporter: Paritosh Ranjan
>              Labels: features, newbie, patch
>             Fix For: 0.6
>
>         Attachments: Clustering Remote Points - Two Big, Useless Clusters.txt, Not Clustering
Remote Points - Two Meaningful Clusters.txt, canopy-clusterFilter-t1, canopy-outlier-elimination,
canopy-outside-t1-points-patch-1, canopy-strict-clustering-flag
>
>
> While finding closest canopy, there is no check to ensure that it returns canopies which
are within distance t1 from the point. This results in incorrect result i.e. Points outside
t1 are grouped in canopies.

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