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From Sergey Bartunov <sbos....@gmail.com>
Subject Re: 20news
Date Mon, 04 Jul 2011 08:58:52 GMT
When I started with Mahout I had the same errors. In my case, I just
didn't run PrepareTwentyNewsgroups. You may try to accurately repeat
all steps from https://cwiki.apache.org/MAHOUT/twenty-newsgroups.html

On 4 July 2011 12:52, Vijay Santhanam <vijay.santhanam@gmail.com> wrote:
> Hi All,
>
> I'm new to Mahout and I'm interested in experimenting with it's classifiers.
>
> Right now, I'm just trying to get up and running with the demo's and
> examples.
>
> After checking out the mahout trunk, I've tried running the classification
> example 20news, but after running the ./examples/bin/build/20news-bayes.sh
> script I get the following error during the classification phase.
>
> Does anyone else get the same thing? Or have any recommendations about how
> to fix it?
> I'd just like to get a sample classifier working before I embark on my own
> classification journey.
>
>
> INFO: Loading model from:
> {basePath=examples/bin/work/20news-bydate/bayes-model, classifierType=bayes,
> alpha_i=1.0, dataSource=hdfs, gramSize=1, verbose=false, encoding=UTF-8,
> defaultCat=unknown,
> testDirPath=examples/bin/work/20news-bydate/bayes-test-input}
> Jul 4, 2011 6:28:25 PM org.slf4j.impl.JCLLoggerAdapter info
> INFO: Testing Bayes Classifier
> Jul 4, 2011 6:28:27 PM org.slf4j.impl.JCLLoggerAdapter info
> INFO: Read 50000 feature weights
> Jul 4, 2011 6:28:27 PM org.slf4j.impl.JCLLoggerAdapter info
> INFO: Read 100000 feature weights
> Jul 4, 2011 6:28:28 PM org.slf4j.impl.JCLLoggerAdapter info
> INFO: 193370.88331085522
> Jul 4, 2011 6:28:30 PM org.slf4j.impl.JCLLoggerAdapter info
> INFO: rec.sport.baseball -129829.34738930278 531784.7805631821
> -0.2441388925268003
> Jul 4, 2011 6:28:30 PM org.slf4j.impl.JCLLoggerAdapter info
> INFO: sci.crypt -193023.42370049533 531784.7805631821 -0.3629728242618669
> Jul 4, 2011 6:28:30 PM org.slf4j.impl.JCLLoggerAdapter info
> INFO: rec.sport.hockey -167853.6159738822 531784.7805631821
> -0.31564200802459647
> Jul 4, 2011 6:28:30 PM org.slf4j.impl.JCLLoggerAdapter info
> INFO: talk.politics.guns -203524.0148974065 531784.7805631821
> -0.3827187658170024
> Jul 4, 2011 6:28:30 PM org.slf4j.impl.JCLLoggerAdapter info
> INFO: soc.religion.christian -163900.9258713857 531784.7805631821
> -0.308209132457322
> Jul 4, 2011 6:28:30 PM org.slf4j.impl.JCLLoggerAdapter info
> INFO: sci.electronics -142854.1677345925 531784.7805631821
> -0.26863154598614886
> Jul 4, 2011 6:28:30 PM org.slf4j.impl.JCLLoggerAdapter info
> INFO: comp.os.ms-windows.misc -531784.7805631821 531784.7805631821 -1.0
> Jul 4, 2011 6:28:30 PM org.slf4j.impl.JCLLoggerAdapter info
> INFO: misc.forsale -143454.70176448982 531784.7805631821
> -0.26976082619845826
> Jul 4, 2011 6:28:30 PM org.slf4j.impl.JCLLoggerAdapter info
> INFO: talk.religion.misc -139428.73484148504 531784.7805631821
> -0.2621901565024562
> Jul 4, 2011 6:28:30 PM org.slf4j.impl.JCLLoggerAdapter info
> INFO: alt.atheism -139569.06867597546 531784.7805631821 -0.2624540486626301
> Jul 4, 2011 6:28:30 PM org.slf4j.impl.JCLLoggerAdapter info
> INFO: comp.windows.x -178029.10523376046 531784.7805631821
> -0.33477660839638973
> Jul 4, 2011 6:28:30 PM org.slf4j.impl.JCLLoggerAdapter info
> INFO: talk.politics.mideast -193075.00789450994 531784.7805631821
> -0.36306982627452317
> Jul 4, 2011 6:28:30 PM org.slf4j.impl.JCLLoggerAdapter info
> INFO: comp.sys.ibm.pc.hardware -138410.02049984262 531784.7805631821
> -0.2602745049477736
> Jul 4, 2011 6:28:30 PM org.slf4j.impl.JCLLoggerAdapter info
> INFO: comp.sys.mac.hardware -125200.9927438868 531784.7805631821
> -0.23543545682389364
> Jul 4, 2011 6:28:30 PM org.slf4j.impl.JCLLoggerAdapter info
> INFO: sci.space -192437.0009266271 531784.7805631821 -0.3618700797018455
> Jul 4, 2011 6:28:30 PM org.slf4j.impl.JCLLoggerAdapter info
> INFO: rec.motorcycles -143142.20855440624 531784.7805631821
> -0.26917319522159455
> Jul 4, 2011 6:28:30 PM org.slf4j.impl.JCLLoggerAdapter info
> INFO: rec.autos -141800.97549909537 531784.7805631821 -0.2666510601317365
> Jul 4, 2011 6:28:30 PM org.slf4j.impl.JCLLoggerAdapter info
> INFO: comp.graphics -166882.18654471825 531784.7805631821
> -0.3138152738556811
> Jul 4, 2011 6:28:30 PM org.slf4j.impl.JCLLoggerAdapter info
> INFO: talk.politics.misc -165196.84193278523 531784.7805631821
> -0.3106460507535303
> Jul 4, 2011 6:28:30 PM org.slf4j.impl.JCLLoggerAdapter info
> INFO: sci.med -192698.5183245711 531784.7805631821 -0.36236185270382393
> Exception in thread "main" java.lang.IllegalArgumentException: Label not
> found: alt.atheism from
>  at
> com.google.common.base.Preconditions.checkArgument(Preconditions.java:88)
> at
> org.apache.mahout.classifier.ConfusionMatrix.getCount(ConfusionMatrix.java:93)
>  at
> org.apache.mahout.classifier.ConfusionMatrix.incrementCount(ConfusionMatrix.java:113)
> at
> org.apache.mahout.classifier.ConfusionMatrix.incrementCount(ConfusionMatrix.java:117)
>  at
> org.apache.mahout.classifier.ConfusionMatrix.addInstance(ConfusionMatrix.java:85)
> at
> org.apache.mahout.classifier.ResultAnalyzer.addInstance(ResultAnalyzer.java:67)
>  at
> org.apache.mahout.classifier.bayes.TestClassifier.classifySequential(TestClassifier.java:244)
> at
> org.apache.mahout.classifier.bayes.TestClassifier.main(TestClassifier.java:177)
>  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:188)
>
>
> Any help is great appreciated.
>
> Regards,
> --
>  Vijay Santhanam
>  Software Engineer
>

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