[jira] [Commented] (MAHOUT-1045) Cluster evaluators returning bad results

["Pat Ferrel (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MAHOUT-1045?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13414123#comment-13414123 ] 

Pat Ferrel commented on MAHOUT-1045:
------------------------------------

>From the inputs to the ClusterEvaluator class I'll try uploading the stuff below as an attachment to this issue:

    conf.set(RepresentativePointsDriver.DISTANCE_MEASURE_KEY, dm.getClass().getName());
    ---> org.apache.mahout.common.distance.CosineDistanceMeasure
    I guess you can just make a note of this

    conf.set(RepresentativePointsDriver.STATE_IN_KEY, "tmp/representative/representativePoints-" + numIters);
    ---> representativePoints-5/*

    ClusterEvaluator ce = new ClusterEvaluator(conf, finalClusters);
    ---> clusters-27-final/*
    The final clusters dir of the k = 500 run.

it's an 22M tar.gz
                
> 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
>
>
> 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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