Mailing-List: contact dev-help@mahout.apache.org; run by ezmlm
Precedence: bulk
Reply-To: dev@mahout.apache.org
Date: Sun, 3 Jun 2012 19:22:24 +0000 (UTC)
From: "Hudson (JIRA)" <jira@apache.org>
To: dev@mahout.apache.org
Message-ID: <1585905699.32171.1338751344359.JavaMail.jiratomcat@issues-vm>
In-Reply-To: 
 <757684725.8668.1330634159416.JavaMail.tomcat@hel.zones.apache.org>
Subject: [jira] [Commented] (MAHOUT-986) OutOfMemoryError in LanczosState by
 way of SpectralKMeans
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 7bit


    [ https://issues.apache.org/jira/browse/MAHOUT-986?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13288240#comment-13288240 ] 

Hudson commented on MAHOUT-986:
-------------------------------

Integrated in Mahout-Quality #1517 (See [https://builds.apache.org/job/Mahout-Quality/1517/])
    MAHOUT-986 Remove old LDA implementation from codebase (Revision 1345736)

     Result = FAILURE
ssc : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1345736
Files : 
* /mahout/trunk/core/src/main/java/org/apache/mahout/clustering/lda/LDADocumentTopicMapper.java
* /mahout/trunk/core/src/main/java/org/apache/mahout/clustering/lda/LDADriver.java
* /mahout/trunk/core/src/main/java/org/apache/mahout/clustering/lda/LDAInference.java
* /mahout/trunk/core/src/main/java/org/apache/mahout/clustering/lda/LDAReducer.java
* /mahout/trunk/core/src/main/java/org/apache/mahout/clustering/lda/LDASampler.java
* /mahout/trunk/core/src/main/java/org/apache/mahout/clustering/lda/LDAState.java
* /mahout/trunk/core/src/main/java/org/apache/mahout/clustering/lda/LDAUtil.java
* /mahout/trunk/core/src/main/java/org/apache/mahout/clustering/lda/LDAWordTopicMapper.java
* /mahout/trunk/core/src/test/java/org/apache/mahout/clustering/ClusteringTestUtils.java
* /mahout/trunk/core/src/test/java/org/apache/mahout/clustering/lda/TestLDAInference.java
* /mahout/trunk/core/src/test/java/org/apache/mahout/clustering/lda/TestMapReduce.java
* /mahout/trunk/src/conf/driver.classes.props
* /mahout/trunk/src/conf/lda.props
* /mahout/trunk/src/conf/ldatopics.props

                
> OutOfMemoryError in LanczosState by way of SpectralKMeans
> ---------------------------------------------------------
>
>                 Key: MAHOUT-986
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-986
>             Project: Mahout
>          Issue Type: Improvement
>          Components: Clustering
>    Affects Versions: 0.6
>         Environment: Ubuntu 11.10 (64-bit)
>            Reporter: Shannon Quinn
>            Assignee: Shannon Quinn
>            Priority: Minor
>             Fix For: 0.7
>
>
> Dan Brickley and I have been testing SpectralKMeans with a dbpedia dataset ( http://danbri.org/2012/spectral/dbpedia/ ); effectively, a graph with 4,192,499 nodes. Not surprisingly, the LanczosSolver throws an OutOfMemoryError when it attempts to instantiate a DenseMatrix of dimensions 4192499-by-4192499 (~17.5 trillion double-precision floating point values). Here's the full stack trace:
> {quote}
> Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
> 	at org.apache.mahout.math.DenseMatrix.<init>(DenseMatrix.java:50)
> 	at org.apache.mahout.math.decomposer.lanczos.LanczosState.<init>(LanczosState.java:45)
> 	at org.apache.mahout.clustering.spectral.kmeans.SpectralKMeansDriver.run(SpectralKMeansDriver.java:146)
> 	at org.apache.mahout.clustering.spectral.kmeans.SpectralKMeansDriver.run(SpectralKMeansDriver.java:86)
> 	at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
> 	at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:79)
> 	at org.apache.mahout.clustering.spectral.kmeans.SpectralKMeansDriver.main(SpectralKMeansDriver.java:53)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
> 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> 	at java.lang.reflect.Method.invoke(Method.java:616)
> 	at org.apache.hadoop.util.ProgramDriver$ProgramDescription.invoke(ProgramDriver.java:68)
> 	at org.apache.hadoop.util.ProgramDriver.driver(ProgramDriver.java:139)
> 	at org.apache.mahout.driver.MahoutDriver.main(MahoutDriver.java:188)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
> 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> 	at java.lang.reflect.Method.invoke(Method.java:616)
> 	at org.apache.hadoop.util.RunJar.main(RunJar.java:156)
> {quote}
> Obviously SKM needs a more sustainable and memory-efficient way of performing an eigen-decomposition of the graph laplacian. For those who are more knowledgeable in the linear systems solvers of Mahout than I, can the Lanczos parameters be tweaked to negate the requirement of a full DenseMatrix? Or should SKM move to SSVD instead?

--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira