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hypex - Online in the Cloud

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This is the command hypex that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator



hypex - computes the Chernoff exponent between two simple categories.


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

hmine -V


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
exponents 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 output only makes sense under
appropriate theoretical conditions. This is a very specialized calculator.


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



-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.


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


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