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From "Paul Hubenig (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAHOUT-1077) apparent spectral kmeans bug
Date Tue, 25 Sep 2012 21:56:07 GMT
Paul Hubenig created MAHOUT-1077:
------------------------------------

             Summary: 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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