Category names with spaces cause NullPointerException in ConfusionMatrix when
testing classifier
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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
Priority: Minor
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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