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From "Sean Owen (Commented) (JIRA)" <>
Subject [jira] [Commented] (MAHOUT-825) Canopies grouping records outside t1
Date Thu, 06 Oct 2011 17:49:29 GMT


Sean Owen commented on MAHOUT-825:

+0 I'd say. The patch is unobtrusive enough to not bother me. The functionality is not obscure
or illogical. The thing about it is that it is sort of endorsing one way to trim outliers
from final clusters (and trimming is a good thing to support), when that way of doing it seems
problematic as it's a fixed threshold.
> Canopies grouping records outside t1
> ------------------------------------
>                 Key: MAHOUT-825
>                 URL:
>             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-outside-t1-points-patch-1,
> 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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