Canopy Emits Too Many Trivial Clusters
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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
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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