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From "Grant Ingersoll (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAHOUT-524) DisplaySpectralKMeans example fails
Date Wed, 02 Nov 2011 21:07:32 GMT

    [ https://issues.apache.org/jira/browse/MAHOUT-524?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13142530#comment-13142530
] 

Grant Ingersoll commented on MAHOUT-524:
----------------------------------------

Making this change does indeed get us well past that problem and leads to:

{quote}
Exception in thread "main" java.lang.NullPointerException
	at org.apache.mahout.math.DenseVector.assign(DenseVector.java:133)
	at org.apache.mahout.math.decomposer.lanczos.LanczosSolver.solve(LanczosSolver.java:160)
	at org.apache.mahout.math.hadoop.decomposer.DistributedLanczosSolver.runJob(DistributedLanczosSolver.java:72)
	at org.apache.mahout.clustering.spectral.kmeans.SpectralKMeansDriver.run(SpectralKMeansDriver.java:155)
	at org.apache.mahout.clustering.display.DisplaySpectralKMeans.main(DisplaySpectralKMeans.java:72)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)
{quote}

Not sure if that is a direct correlation to my change or not, but continue to debug
                
> DisplaySpectralKMeans example fails
> -----------------------------------
>
>                 Key: MAHOUT-524
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-524
>             Project: Mahout
>          Issue Type: Bug
>          Components: Clustering
>    Affects Versions: 0.4, 0.5
>            Reporter: Jeff Eastman
>            Assignee: Shannon Quinn
>              Labels: clustering, k-means, visualization
>             Fix For: 0.6
>
>         Attachments: EclipseLog_20110918.txt, SpectralKMeans_fail_20110919.txt, aff.txt,
raw.txt, spectralkmeans.png
>
>
> I've committed a new display example that attempts to push the standard mixture of models
data set through spectral k-means. After some tweaking of configuration arguments and a bug
fix in EigenCleanupJob it runs spectral k-means to completion. The display example is expecting
2-d clustered points and the example is producing 5-d points. Additional I/O work is needed
before this will play with the rest of the clustering algorithms. 

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