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dbacl - digramic Bayesian text classifier…  more info»

hypex.1.gz

HMINE(1)                                                    HMINE(1)



NAME
       hypex  -  computes  the  Chernoff exponent between two simple
       categories.

SYNOPSIS
       hypex [-hH size] [-s stepsize] CATDUMP1 CATDUMP2

       hmine -V

DESCRIPTION
       hypex reads two category dumps  produced  by  dbacl(1)  after
       learning.   A  category  dump is obtained using the -d and -l
       switches, and is a  textual  representation  of  the  feature
       weights which exist in the binary category files.

       Given  two such category dumps for simple unigram categories,
       hypex calculates the Kullback Leibler divergence between  the
       probability  models,  and  prints out exponential error expo‐
       nents for Neyman-Pearson hypothesis tests under  a  range  of
       threshold  values.  See  Cover  and Thomas (1991) Elements of
       Information Theory, Chap. 12.

       Note that only simple categories are supported, and the  out‐
       put  only  makes  sense  under appropriate theoretical condi‐
       tions. This is a very specialized calculator.

EXIT STATUS
       hypex returns 0 on success, 1 if an error occurs.

OPTIONS
       -h

       -H     Same as dbacl(1). Selects the hash sizes in powers  of
              two.

       -s     Stepsize  for  the threshold.  hypex outputs exponents
              for different  values  of  the  threshold,  within  an
              interval  bounded  by the Kullback Leibler divergences
              between the categories.

       -V     Print the program version number and exit.

SOURCE
       The source code for the latest version  of  this  program  is
       available at the following locations:

       http://www.lbreyer.com/gpl.html
       http://dbacl.sourceforge.net

BUGS
       Doesn't work with complex categories, and theoretical assump‐
       tions are unrealistic in practice.

AUTHOR
       Laird A. Breyer <laird@lbreyer.com>

SEE ALSO
       dbacl(1), mailcross(1),  mailfoot(1),  mailinspect(1),  mail‐
       toe(1), regex(7)




Version 1.12        Bayesian Classification Tools           HMINE(1)
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