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https://issues.apache.org/jira/browse/MAHOUT-1045?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13414757#comment-13414757
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Pat Ferrel commented on MAHOUT-1045:
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I changed the init values in inter and intra-cluster methods and iterated
through intra-cluster calc until the first time you get a density = NaN. The
breakpoint is on this line.
log.info("Intra-Cluster Density[{}] = {}", cluster.getId(), density);
I've attached the debug output. It will mean more to you than me but one odd
thing is that the radius vector has weights on keys of NaN in spots?
> Cluster evaluators returning bad results
> ----------------------------------------
>
> Key: MAHOUT-1045
> URL: https://issues.apache.org/jira/browse/MAHOUT-1045
> Project: Mahout
> Issue Type: Bug
> Components: Clustering
> Affects Versions: 0.6, 0.7, 0.8
> Environment: Several environments and data sets
> Reporter: Pat Ferrel
> Fix For: 0.8
>
> Attachments: MAHOUT-1045.patch
>
>
> With real world crawl data the Intra-cluster density from ClusterEvaluator is
> almost always NaN. The CDbw inter-cluster density is almost always 0. I have
> also seen several cases where CDbw fails to return any results but have not
> tracked down why yet.
> I have sent a link to an 8G data set that reproduces these errors to Jeff
> Eastman.
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