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


Grant Ingersoll commented on MAHOUT-524:

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

Exception in thread "main" java.lang.NullPointerException
	at org.apache.mahout.math.DenseVector.assign(
	at org.apache.mahout.math.decomposer.lanczos.LanczosSolver.solve(
	at org.apache.mahout.math.hadoop.decomposer.DistributedLanczosSolver.runJob(
	at org.apache.mahout.clustering.display.DisplaySpectralKMeans.main(
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(
	at java.lang.reflect.Method.invoke(
	at com.intellij.rt.execution.application.AppMain.main(

Not sure if that is a direct correlation to my change or not, but continue to debug
> DisplaySpectralKMeans example fails
> -----------------------------------
>                 Key: MAHOUT-524
>                 URL:
>             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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