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https://issues.apache.org/jira/browse/MAHOUT-1077?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13534765#comment-13534765
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sdfox commented on MAHOUT-1077:
-------------------------------
The dimension of 'triDiag' matrix in LanczosState and the 'desiredRank' in
LanczosSolver was inconsistent.
It caused the LanczosSolver set the element with index which is out of bound of
triDiag.
Should it be the LanczosSolver use the dimension of matrix in LanczosState as
desiredRank to avoid using incorrectly this solver?
> apparent spectral kmeans bug
> ----------------------------
>
> Key: MAHOUT-1077
> URL: https://issues.apache.org/jira/browse/MAHOUT-1077
> Project: Mahout
> Issue Type: Bug
> Components: Clustering
> Affects Versions: 0.7
> Reporter: Paul Hubenig
>
> Using example data at:
> https://cwiki.apache.org/MAHOUT/spectral-clustering.html
> 0,0,0
> 0,1,0.8
> 0,2,0.5
> 1,0,0.8
> 1,1,0
> 1,2,0.9
> 2,0,0.5
> 2,1,0.9
> 2,2,0
> Using 0.7 distribution.
> mahout spectralkmeans -i file:///Users/phubenig/affExGraph.txt -o
> file:///Users/phubenig/spectralEx -k 2 -d 3 -x 30 -cd 0.01 -ow
> 12/09/05 16:14:00 INFO mapred.JobClient: Combine output records=1
> 12/09/05 16:14:00 INFO mapred.JobClient: Reduce output records=1
> 12/09/05 16:14:00 INFO mapred.JobClient: Map output records=1
> 12/09/05 16:14:00 INFO lanczos.LanczosSolver: 2 passes through the corpus so
> far...
> Exception in thread "main" org.apache.mahout.math.IndexException: Index 2 is
> outside allowable range of [0,2)
> at org.apache.mahout.math.AbstractMatrix.set(AbstractMatrix.java:479)
> at
> org.apache.mahout.math.decomposer.lanczos.LanczosSolver.solve(LanczosSolver.java:132)
> at
> org.apache.mahout.math.hadoop.decomposer.DistributedLanczosSolver.runJob(DistributedLanczosSolver.java:73)
> at
> org.apache.mahout.clustering.spectral.kmeans.SpectralKMeansDriver.run(SpectralKMeansDriver.java:148)
> 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:39)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> at java.lang.reflect.Method.invoke(Method.java:597)
> 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:195)
> 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 org.apache.hadoop.util.RunJar.main(RunJar.java:156)
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