Hi guys, It seems like to really customise the scoring in lucene, one will have to go into the lucene source.
I spend a fair bit of time looking into this and it seems to me not the full scoring api is exported. The formula documented on the Similarity class seems to explain how a term is scored, but not, for example, how the final score on a Boolean query is computed from each individual component. (Please correct me if I'm wrong). Normalisation is another part where the API is not exported. Anson -----Original Message----- From: Otis Gospodnetic [mailto:[EMAIL PROTECTED] Sent: Wednesday, June 23, 2004 3:51 AM To: Lucene Users List Subject: Re: using boost factor Hello Anson, I would look at IndexSearcher's explain method: http://jakarta.apache.org/lucene/docs/api/org/apache/lucene/search/IndexSear cher.html#explain(org.apache.lucene.search.Query,%20int) This should give you insight into what's contributing to the high/low scores, thus telling you what you can tweak. Perhaps it's just the boost, perhaps some other similarity factors. Using explain should provide you information such as this, for example: http://www.mozdex.com/explain.jsp?idx=2&id=2067257&query=goober I hope this helps. Somebody else will probably be able to give more information, but this should get you started while you wait. Otis --- Anson Lau <[EMAIL PROTECTED]> wrote: > Hi guys, > > Lets say I want to search the term "hello world" over 3 fields with > different boost: > > ((hello:field1 world:field1)^0.001 (hello:field2 world:field2)^100 > (hello:field3 world:field3)^20000)) > > Note I've given field1 a really low boost, a heavy boost to field2 > and a > REALLY heavy boost to field3. > > What is happening to me is that a term that matches both field1 and > field2, > will have a higher score than a term that matches field3 only, even > though > field3's boost is WAY higher. > > Can I change this behaviour such that the match in field3 only will > actually > have a higher score because of the boost? > > Thanks, > > Anson --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
