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From "Paritosh Ranjan (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAHOUT-825) Canopies grouping records outside t1
Date Fri, 07 Oct 2011 17:40:29 GMT

     [ https://issues.apache.org/jira/browse/MAHOUT-825?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Paritosh Ranjan updated MAHOUT-825:
-----------------------------------

    Attachment: canopy-radius-based-outlier-elimination

Here goes the compromise patch named canopy-radius-based-outlier-elimination ( attached )
J :). It has no impact on the buildCluster phase.

It uses radius based outlier elimination controlled by a parameter clusterStrictness. 

There are junit tests, which show the usage of this flag.
                
> 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-radius-based-outlier-elimination, 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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