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https://issues.apache.org/jira/browse/MAHOUT-1086?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ted Dunning updated MAHOUT-1086:
--------------------------------
Attachment: 0001-MAHOUT-1086-Deal-with-round-off-errors-in-computing-.patch
Here is a patch in git format. I can't remember if jenkins will apply that
cleanly or not.
The problem was round-off errors that happened differently when the ordering of
operations is different. That ordering is changed when caching is changed and
this problem comes up.
The expected result of this patch is that the old error will come back
(reversed). That is, you should see
{code}
Failed tests:
testCanopyEuclideanMRJobNoClustering(org.apache.mahout.clustering.meanshift.TestMeanShift):
count expected:<4> but was:<3>
{code}
> 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
> Attachments:
> 0001-MAHOUT-1086-Deal-with-round-off-errors-in-computing-.patch
>
>
> 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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