NB testclassifier runs in sequential mode by default
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                 Key: MAHOUT-894
                 URL: https://issues.apache.org/jira/browse/MAHOUT-894
             Project: Mahout
          Issue Type: Bug
          Components: Classification
    Affects Versions: 0.6
            Reporter: tom pierce


NB classifiers can only be trained in MR mode, but evaluation happens in 
sequential mode by default.  I think this violates the principle of least 
surprise - anyone trying this out is likely to expect the opposite.

I'm attaching a patch to flip the default.

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