> > >> -----Original Message----- > > >> From: Paul Taylor [mailto:paul_t...@fastmail.fm] > > >> Sent: Saturday, January 28, 2012 10:33 AM > > >> To: 'java-user@lucene.apache.org' > > >> Subject: Does Fuzzy Search scores the same as Exact Match > > >> > > >> All things being equal does a fuzzy match give the same score as an > > >> exact match. > > >> i.e if I do a search for farmin and it matches two docs one on term > > > farmin, the > > >> other on term farming, will it score farming higher or score both > > >> the same > > > ? > > > > > > YES, depends on the Fuzzy configuration (rewrite method,...), but > > > the default does so! > > > > > > Uwe > > > > > > > > So how do I change it, seems like a funny default to have. > > Maybe I was not clear, it should score "farming" higher than "farmin" by > default, but the default rewrite mode also takes TF/IDF into account (in > addition).
Maybe there was some confusion in your original question, to make it clear: If you search for "farming", "farming" (exact match) should score higher than "farmin" (distance 1). With default rewrite mode this is correct for boosting, but if a typo is more unlikely in the corpus, then based on TF-IDF the score can still be different. You can prohibit that by using the right rewrite mode that *only* takes levensthein distance as inverse boost and not use TF-IDF => http://goo.gl/0eJ47 > You can change that by a different rewrite method: > > The default is: http://goo.gl/JhHOA (which combines the standard vector model > with additionally boosting exact matches - we have that for backwards > compatibility only, its not what most users expect) > > The better one is: http://goo.gl/0eJ47, which does not take TF/IDF into account > and only boosts by levensthein distance. > > You can disable fuzzy boosting altogether: > Additionally http://goo.gl/VWlkW provides two other scoring models (TF/IDF > only, no boosting - or constant score at all) > > Uwe > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org > For additional commands, e-mail: java-user-h...@lucene.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org For additional commands, e-mail: java-user-h...@lucene.apache.org
