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From Drew Farris <drew.far...@gmail.com>
Subject Re: Array out of bounds in the KMeans driver
Date Sat, 19 Dec 2009 22:31:18 GMT
The stack trace below suggests that the input file may not contain any
vectors because the code inside the while loop at 77, (esp. the
conditional starting at line 82) never fired and thus either (or both)
chosenTests or chosenClusters is empty.

There should likely be some form of bounds check on line 98 of
RandomSeedGenerator, but that woundn't solve the problem if the input
file is empty.

On Sat, Dec 19, 2009 at 5:07 PM, Benson Margulies <bimargulies@gmail.com> wrote:
> ../hadoop-0.20.1/bin/hadoop jar
> examples/target/mahout-examples-0.3-SNAPSHOT.job
> org.apache.mahout.clustering.kmeans.KMeansDriver  --input
> testdata/he_mahout_vector -c clusters -o output -m
> org.apache.mahout.common.distance.ManhattanDistanceMeasure -k 7
>
>
> 09/12/19 17:02:18 WARN util.NativeCodeLoader: Unable to load
> native-hadoop library for your platform... using builtin-java classes
> where applicable
> 09/12/19 17:02:18 INFO compress.CodecPool: Got brand-new decompressor
> 09/12/19 17:02:18 INFO compress.CodecPool: Got brand-new compressor
> Exception in thread "main" java.lang.IndexOutOfBoundsException: Index:
> 0, Size: 0
>        at java.util.ArrayList.RangeCheck(ArrayList.java:547)
>        at java.util.ArrayList.get(ArrayList.java:322)
>        at org.apache.mahout.clustering.kmeans.RandomSeedGenerator.buildRandom(RandomSeedGenerator.java:94)
>        at org.apache.mahout.clustering.kmeans.KMeansDriver.main(KMeansDriver.java:158)
>        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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