Paul Hubenig created MAHOUT-1077:
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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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