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Posted to dev@mahout.apache.org by "Jeff Eastman (Resolved) (JIRA)" <ji...@apache.org> on 2011/09/28 22:16:45 UTC
[jira] [Resolved] (MAHOUT-818) Canopy Emits Too Many Trivial
Clusters
[ https://issues.apache.org/jira/browse/MAHOUT-818?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Jeff Eastman resolved MAHOUT-818.
---------------------------------
Resolution: Fixed
Patch committed to trunk
> Canopy Emits Too Many Trivial Clusters
> --------------------------------------
>
> Key: MAHOUT-818
> URL: https://issues.apache.org/jira/browse/MAHOUT-818
> Project: Mahout
> Issue Type: Improvement
> Components: Clustering
> Affects Versions: 0.5
> Reporter: Jeff Eastman
> Assignee: Jeff Eastman
> Fix For: 0.6
>
> Attachments: MAHOUT-818.patch
>
>
> Users of Canopy clustering report that the single reducer used in the mapreduce version often takes dispropportately long to process the results of multiple mappers. This patch introduces a new Canopy CLI argument, -cf (--clusterFilter), which if present establishes a lower bound on the numPoints of canopies output from the algorithm. The default value for this filter is 0, and all canopies are output. Setting -cf 1 would eliminate any canopies which contain only 1 point from subsequent processing steps.
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