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=head1 EXPORT

None by design.

=head1 SO THAT YOU DO NOT LOSE RELEVANCY JUDGMENTS

You have to be careful when carrying out Precision verses Recall calculations if you
do not wish to lose the previously created relevancy judgments. Invoking the method
C<estimate_doc_relevancies()> in your own script will cause the file C<relevancy.txt>
to be overwritten.  If you have created a relevancy database and stored it in a file
called, say, C<relevancy.txt>, you should make a backup copy of this file before
executing a script that calls C<estimate_doc_relevancies()>.

=head1 BUGS

Please notify the author if you encounter any bugs.  When sending email, please place
the string 'VSM' in the subject line to get past my spam filter.

=head1 INSTALLATION

Download the archive from CPAN in any directory of your choice.  Unpack the archive