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https://issues.apache.org/jira/browse/MAHOUT-1086?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13466654#comment-13466654
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Ted Dunning commented on MAHOUT-1086:
-------------------------------------
OK. The problem was round-off errors introduced by the new formulation. The
caching of squared lengths apparently changed which round-off errors occurred
which triggered a change in the (excessively) sensitive clustering tests.
Patch coming shortly.
> Mean Shift Test Now Produces 4 Clusters
> ---------------------------------------
>
> Key: MAHOUT-1086
> URL: https://issues.apache.org/jira/browse/MAHOUT-1086
> Project: Mahout
> Issue Type: Bug
> Components: Clustering
> Affects Versions: 0.7
> Reporter: Jeff Eastman
>
> Something changed in Mahout around 9/6/12 that caused
> TestMeanShift.testCanopyEuclideanMRJobNoClustering to return 4 clusters
> rather than 3. All of the other tests using the same data still return 3
> clusters. No changes were made to any of the MeanShiftCanopy classes other
> than 1 formatting change to the driver so I'm at a loss to the cause.
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