Not advocating any particular approach here, just curious: could BMW also function in the presence of a doc-score (like recency) that is multiplied? My vague understanding is that as long as the scoring formula is monotonic in all of its inputs, and we have block-encoded the inputs, then we could compute a max score for a block?
On Thu, Sep 16, 2021 at 12:41 PM Adrien Grand <jpou...@gmail.com> wrote: > > Hello, > > You are correct that the contribution would be additive in that case. We > don't provide an easy way to make the contribution multiplicative. > > There is some debate about what is the best way to combine BM25 scores with > query-independent features, though in the discussions I've seen > contributions were summed up and the debate was more about whether they > should be normalized or not. > > How much recency impacts ranking indeed depends on the number of terms and > how frequent these terms are. One way that I'm interpreting the fact that > not everyone recommends normalizing scores is that this way the query score > dominates when the query is looking for something very specific, because it > includes many terms or because it uses very specific terms - which may be a > feature. This approach also works well for Lucene since dynamic pruning via > Block-Max WAND keeps working when query-independent features are > incorporated into the final score, which helps figure out the top hits > without having to collect all matches. > > On Thu, Sep 16, 2021 at 5:40 PM Nicolás Lichtmaier > <nicol...@wolfram.com.invalid> wrote: > > > On March I've asked a question here that go no answers at all. As it > > still something that I'd very much like to know I'll ask again. > > > > To implement "recency" into a search you would add a boolean clause with > > a LongPoint.newDistanceFeatureQuery(), right? But that's additive, > > meaning that this recency will impact different for searches with > > different number of terms, right? With more terms the recency component > > contribution to score will be more and more "diluted". However... I only > > see examples using this way of doing, and I would need to do something > > weird to implement a multiplicative change of the score... Am I missing > > something? > > > > Thanks! > > > > > > --------------------------------------------------------------------- > > To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org > > For additional commands, e-mail: java-user-h...@lucene.apache.org > > > > > > -- > Adrien --------------------------------------------------------------------- To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org For additional commands, e-mail: java-user-h...@lucene.apache.org
