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https://issues.apache.org/jira/browse/MAHOUT-569?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen resolved MAHOUT-569.
------------------------------
Resolution: Fixed
Fix Version/s: 0.5
Assignee: Sean Owen
> Category names with spaces cause NullPointerException in ConfusionMatrix when
> testing classifier
> ------------------------------------------------------------------------------------------------
>
> Key: MAHOUT-569
> URL: https://issues.apache.org/jira/browse/MAHOUT-569
> Project: Mahout
> Issue Type: Bug
> Components: Classification
> Affects Versions: 0.5
> Environment: Mac OS 10.6.5 and RHL
> Reporter: Raviv M-G
> Assignee: Sean Owen
> Priority: Minor
> Fix For: 0.5
>
> Attachments: MAHOUT-569.patch
>
>
> If you try to perform classification using categories with spaces in their
> names then the classifier will happily train and create a model for you, but
> when you go to test the model you get:
> Exception in thread "main" java.lang.NullPointerException
> at
> org.apache.mahout.classifier.ConfusionMatrix.getCount(ConfusionMatrix.java:102)
> at
> org.apache.mahout.classifier.ConfusionMatrix.incrementCount(ConfusionMatrix.java:118)
> at
> org.apache.mahout.classifier.ConfusionMatrix.incrementCount(ConfusionMatrix.java:122)
> at
> org.apache.mahout.classifier.ConfusionMatrix.addInstance(ConfusionMatrix.java:90)
> at
> org.apache.mahout.classifier.ResultAnalyzer.addInstance(ResultAnalyzer.java:69)
> at
> org.apache.mahout.classifier.bayes.TestClassifier.classifySequential(TestClassifier.java:266)
> at
> org.apache.mahout.classifier.bayes.TestClassifier.main(TestClassifier.java:186)
> 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:182)
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