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Error creating mahout model

I train the mahout classifier for my data, The following commands that I issued to create the mahout model

./bin/mahout seqdirectory -i /tmp/mahout-work-root/MyData-all -o /tmp/mahout-work-root/MyData-seq ./bin/mahout seq2sparse -i /tmp/mahout-work-root/MyData-seq -o /tmp/mahout-work-root/MyData-vectors -lnorm -nv -wt tfidf ./bin/mahout split -i /tmp/mahout-work-root/MyData-vectors/tfidf-vectors --trainingOutput /tmp/mahout-work-root/MyData-train-vectors --testOutput /tmp/mahout-work-root/MyData-test-vectors --randomSelectionPct 40 --overwrite --sequenceFiles -xm sequential ./bin/mahout trainnb -i /tmp/mahout-work-root/Mydata-train-vectors -el -o /tmp/mahout-work-root/model -li /tmp/mahout-work-root/labelindex -ow

When I try to create a model using the trainnb command, I get the following exception:

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 1 at org.apache.mahout.classifier.naivebayes.BayesUtils.writeLabelIndex(BayesUtils.java:119) at org.apache.mahout.classifier.naivebayes.training.TrainNaiveBayesJob.createLabelIndex(TrainNaiveBayesJob.java:152)

What could be the problem?

Note: the original example mentioned here is working fine.

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1 answer

I think this may be the problem of how you put your training files. Files should be organized as follows:

Mydata-all

\ CLASSA

  -file1 -file2 -...

\ ClassB

  -filex

....

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