[jira] [Created] (MAHOUT-1531) Remove ALPHA_I CLI option in NB

["Andrew Palumbo (JIRA)" <ji...@apache.org>]

Andrew Palumbo created MAHOUT-1531:
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             Summary: Remove ALPHA_I CLI option in NB
                 Key: MAHOUT-1531
                 URL: https://issues.apache.org/jira/browse/MAHOUT-1531
             Project: Mahout
          Issue Type: Bug
          Components: Classification, CLI
    Affects Versions: 0.9
         Environment:  
            Reporter: Andrew Palumbo
            Priority: Minor
             Fix For: 1.0


The APLHA_I CLI option accepts a float for what should be a vector of floats (or more correctly a path to a SequenceFile containing word, alpha_i pairs for each word in the respective dictionary).   The current MapReduce NB implementation treats APLHA_I as a constant float where it should be a vector (ALPHA) of floats (smoothing parameter per word).  

However as (Rennie et al.) sec 2.2 uses a constant ALPHA_I = 1 and the NB implementation defaults to APLHA_I = 1 and is an implementation of Rennie, there is not really a problem.

To avoid confusion, I think its a good idea to remove the option to set ALPHA_I and to keep ALPHA_I a constant 1.0 in NB.

   



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