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https://issues.apache.org/jira/browse/MAHOUT-825?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13119914#comment-13119914
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Paritosh Ranjan commented on MAHOUT-825:
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The clusterData phase runs only when runClustering variable is true ( as shown
in the code snippet below ). So, the canopies are already generated and
computed before clusterData phase.
if (runClustering) { clusterData(conf, input, clustersOut, output, measure, t1,
t2, runSequential); }
clusterData is just grouping/pointing/classifying/identifying that which point
belongs to which canopy. Adding a remote point (greater than t1) to the already
generated/computed canopies is just wasting this grouping functionality. There
is no use of doing it.
> 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: 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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