20 Aug 2010 00:48:58 UTC
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- Distribution: KinoSearch
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- Latest versionCREAMYG Marvin Humphreyand 1 contributors
- Marvin Humphrey <marvin at rectangular dot com>
KinoSearch::Analysis::Stopalizer - Suppress a "stoplist" of common words.
my $stopalizer = KinoSearch::Analysis::Stopalizer->new( language => 'fr', ); my $polyanalyzer = KinoSearch::Analysis::PolyAnalyzer->new( analyzers => [ $case_folder, $tokenizer, $stopalizer, $stemmer ], );
This class uses Lingua::StopWords for its default stoplists, so it supports the same set of languages.
A "stoplist" is collection of "stopwords": words which are common enough to be of little value when determining search results. For example, so many documents in English contain "the", "if", and "maybe" that it may improve both performance and relevance to block them.
Before filtering stopwords:
( "i", "am", "the", "walrus" )
After filtering stopwords:
( "walrus" );
Stopalizer provides default stoplists for several languages, courtesy of the Snowball project (<http://snowball.tartarus.org>), or you may supply your own.
my $stopalizer = KinoSearch::Analysis::Stopalizer->new( language => 'de', ); # or... my $stopalizer = KinoSearch::Analysis::Stopalizer->new( stoplist => \%stoplist, );
stoplist - A hash with stopwords as the keys.
language - The ISO code for a supported language.
Copyright 2005-2010 Marvin Humphrey
This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.