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From "Joe Prasanna Kumar (JIRA)" <>
Subject [jira] Updated: (MAHOUT-509) Options in Bayes TrainClassifier and TestClassifier
Date Fri, 08 Oct 2010 04:48:30 GMT


Joe Prasanna Kumar updated MAHOUT-509:

    Attachment: MAHOUT-509-fix-TestClassifier.patch

I have fixed TestClassifier with making the parameters ngram, classifiertype and datasource
as optional. Verified that this works. So to test a classifier (say with wikipedia example),
the command would be {code} $MAHOUT_HOME/bin/mahout testclassifier -m wikipediamodel -d wikipediainput
-method mapreduce {code}

> Options in Bayes TrainClassifier and TestClassifier
> ---------------------------------------------------
>                 Key: MAHOUT-509
>                 URL:
>             Project: Mahout
>          Issue Type: Bug
>          Components: Classification
>            Reporter: Joe Prasanna Kumar
>            Assignee: Robin Anil
>            Priority: Minor
>             Fix For: 0.4
>         Attachments: MAHOUT-509-fix-TestClassifier.patch, MAHOUT-509.patch, MAHOUT-509_1.patch
> Hi all,
> As I was going through wikipedia example, I encountered a situation with TrainClassifier
wherein some of the options with default values are actually mandatory. 
> The documentation / command line help says that 
> default source (--datasource) is hdfs but TrainClassifier has withRequired(true) while
building the --datasource option. We are checking if the dataSourceType is hbase else set
it to hdfs. so ideally withRequired should be set to false
> default --classifierType is bayes but withRequired is set to true and we have code like
> if ("bayes".equalsIgnoreCase(classifierType)) {
>"Training Bayes Classifier");
>         trainNaiveBayes(inputPath, outputPath, params);
>       } else if ("cbayes".equalsIgnoreCase(classifierType)) {
>"Training Complementary Bayes Classifier");
>         // setup the HDFS and copy the files there, then run the trainer
>         trainCNaiveBayes(inputPath, outputPath, params);
>       }
> which should be changed to
> if ("cbayes".equalsIgnoreCase(classifierType)) {
>"Training Complementary Bayes Classifier");
>         trainCNaiveBayes(inputPath, outputPath, params);
>       } else  {
>"Training  Bayes Classifier");
>         // setup the HDFS and copy the files there, then run the trainer
>         trainNaiveBayes(inputPath, outputPath, params);
>       }
> Please let me know if this looks valid and I'll submit a patch for a JIRA issue.
> reg
> Joe.

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