Please give full details of what you did. Command line wise On Mon, Nov 8, 2010 at 12:54 PM, siddharth chhabra < [email protected]> wrote:
> > Hi > I am new to mahout and am using the trunk which I was able to successfully > build with maven. > I tried to run the newsgroup example and was able to train the classifier > successfully. > But while running the testclassifier I got a NPE as follows - > > 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:68) > 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:184) > > I am running this locally without hadoop. > I tried following the instructions here - > https://cwiki.apache.org/confluence/display/MAHOUT/Twenty+Newsgroups > I created the folder bayes-test-input and dropped in a document there for > testing purposes but that didnt seem to work. > > Any pointers will be appreciated. > > Thanks > -Sid >
