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From "Suman Somasundar (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAHOUT-1635) Getting an exception when I provide classification labels manually for Naive Bayes
Date Fri, 03 Apr 2015 18:01:54 GMT

    [ https://issues.apache.org/jira/browse/MAHOUT-1635?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14394787#comment-14394787
] 

Suman Somasundar commented on MAHOUT-1635:
------------------------------------------

OK. It would have been a good feature to have since it takes a lot of time to scan through
millions of records to extract the classification labels.
I will also look into this to see what can be done. 

> Getting an exception when I provide classification labels manually for Naive Bayes
> ----------------------------------------------------------------------------------
>
>                 Key: MAHOUT-1635
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-1635
>             Project: Mahout
>          Issue Type: Bug
>          Components: Classification
>    Affects Versions: 0.9
>            Reporter: Suman Somasundar
>            Assignee: Andrew Palumbo
>              Labels: legacy
>             Fix For: 0.10.0
>
>         Attachments: zip_1
>
>
> If I let the Naive Bayes program itself extract the classification labels, the program
runs fine. But, I get the following error when I provide the classification labels for the
dataset manually.
> Error: java.lang.IllegalArgumentException: Wrong numLabels: 0. Must be > 0!
>         at com.google.common.base.Preconditions.checkArgument(Preconditions.java:88)
>         at org.apache.mahout.classifier.naivebayes.training.WeightsMapper.setup(WeightsMapper.java:45)
>         at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:142)
>         at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:784)
>         at org.apache.hadoop.mapred.MapTask.run(MapTask.java:341)
>         at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:169)
>         at java.security.AccessController.doPrivileged(Native Method)
>         at javax.security.auth.Subject.doAs(Subject.java:415)
>         at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1640)
>         at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:164)



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