On 4/10/2009 5:13 PM, Steven Bethard wrote: > On 4/10/2009 12:56 PM, Steven Bethard wrote: >> I need to have a scoring model of the form: >> >> s1(d, q)^a1 * s2(d, q)^a2 * ... * sN(d, q)^aN >> >> where "d" is a document, "q" is a query, "sK" is a scoring function, and >> "aK" is the exponential boost factor for that scoring function. [snip] > My third thought was to create a wrapper class that takes a Query and an > exponential boost factor. The wrapper class would delegate to the Query > for all methods except .weight(). For .weight(), it would return a > Weight wrapper that delegated to the Weight for all methods except > .getValue(). For .getValue(), it would return the original value, raised > to the appropriate exponent. But will that really work, or am I going to > mess up the normalization or something else?
I've started playing around with this route. I'm not 100% sure I've implemented all the Query and Weight methods correctly (the documentation for these is pretty terse), but assuming I have it right, that should give me the ability to create the "s(d, q)^a" terms, by just coming up with a Query for each term, and then wrapping it in my wrapper class to add the exponential boost. So to finish up the scoring, I want to create a Query that takes all the sub-queries and just multiplies their scores together. This seems like something Lucene must already be doing somewhere. I looked at BooleanQuery hoping maybe that was already doing something like this, but BooleanWeight.getValue() just seems to return the boost factor, so I guess not. So does anyone know of an existing Query class that will simply multiply its sub-queries together? More generally, is there any other documentation about Lucene's scoring mechanisms than the following? There isn't quite enough detail (or I don't know how to read it) to answer my questions here. http://lucene.apache.org/java/2_4_1/scoring.html http://lucene.apache.org/java/2_4_1/api/org/apache/lucene/search/package-summary.html Also, I seem to have gotten very little response to my questions here, perhaps because they are asking about the expert interfaces? Is there a better place to ask such questions? Thanks, Steve --------------------------------------------------------------------- To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org For additional commands, e-mail: java-user-h...@lucene.apache.org
