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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAHOUT-1045) Cluster evaluators returning bad results
Date Sun, 19 Aug 2012 18:39:37 GMT

    [ https://issues.apache.org/jira/browse/MAHOUT-1045?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13437564#comment-13437564
] 

Andrew Purtell commented on MAHOUT-1045:
----------------------------------------

The integration tests checked in with this patch appear to want an absolute path hardcoded
to the developer's home directory:

{noformat}
mvn -Dhadoop.version=2.0.0-alpha clean install
[...]
Tests in error: 
  testClusterEvaluator(org.apache.mahout.clustering.MAHOUT1045Test): /Users/jeff/Desktop/jeff/kmeans-clusters/clusters-27-final
  testCDbwEvaluator(org.apache.mahout.clustering.MAHOUT1045Test): /Users/jeff/Desktop/jeff/kmeans-clusters/clusters-27-final
{noformat}


                
> 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: first-time-density-nan.txt, MAHOUT-1045.patch, MAHOUT-1045.patch,
MAHOUT-1045.patch, 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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