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lib/Algorithm/TicketClusterer.pm  view on Meta::CPAN

parameter limits the number of synonyms chosen to the value used for the parameter.
When the number of synonyms returned by WordNet is greater than the value set for
this parameter, the synonyms retained are chosen randomly from the list returned by
WordNet.

=item I<min_idf_threshold:>

First recall that IDF stands for Inverse Document Frequency.  It is calculated during
the second of the three-stage processing of the tickets as described in the section
B<THE THREE STAGES OF PROCESSING TICKETS>.  The IDF value of a word gives us a
measure of the discriminatory power of the word.  Let's say you have a word that
occurs in only one out of 1000 tickets.  Such a word is obviously highly
discriminatory and its IDF would be the logarithm (to base 10) of the ratio of 1000
to 1, which is 3.  On the other hand, for a word that occurs in every one of 1000
tickets, its IDF value would be the logarithm of the ratio of 1000 to 1000, which is
0.  So, for the case when you have 1000 tickets, the upper bound on IDF is 3 and the
lower bound 0. This constructor parameter controls which of the query words you will
use for constructing the initial pool of tickets that will be used for matching.  The
larger the value of this threshold, the smaller the pool obviously.

=item I<min_word_length:>