Grant Ingersoll wrote: > For a long time now, we've been telling people not to compare scores across > queries, yet we maintain the queryNorm() code as an attempt to do this and > the javadocs even promote it. I'm in the process of researching this some > more (references welcomed), but wanted to hear what people think about it > here. I haven't profiled it just yet, but it seems like a good chunk of > wasted computation to me (loops, divisions and square roots). At a minimum, > I think we might be able to refactor the callback mechanism for it just as we > did for the collectors, such that we push of the actual calculation of the > sum of squares into Similarity, instead of just doing 1/sqrt(sumSqs). That > way, when people want to override queryNorm() to return 1, they are saving > more than just the 1/sqrt calculation. I haven't tested it yet, but wanted > to find out what others think. > > Thoughts? > > -Grant > --------------------------------------------------------------------- > To unsubscribe, e-mail: java-dev-unsubscr...@lucene.apache.org > For additional commands, e-mail: java-dev-h...@lucene.apache.org > > Here is old discussion http://issues.apache.org/jira/browse/LUCENE-1896.
Its essentially no cost and has minor benefits - I'm still +1 for keeping it. --------------------------------------------------------------------- To unsubscribe, e-mail: java-dev-unsubscr...@lucene.apache.org For additional commands, e-mail: java-dev-h...@lucene.apache.org
