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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