I think the OP meant to use random order in the case of score ties. On Wed, Jan 11, 2012 at 9:31 PM, Erick Erickson <erickerick...@gmail.com>wrote:
> Alexandre: > > Have you thought about grouping? If you can analyze the incoming > documents and include a field such that "similar" documents map > to the same value, than group on that value you'll get output that > isn't dominated by repeated copies of the "similar" documents. It > depends, though, on being able to do a suitable mapping. > > In your case, could the mapping just be the site from which you > got the data? > > Best > Erick > > On Wed, Jan 11, 2012 at 1:58 PM, Alexandre Rocco <alel...@gmail.com> > wrote: > > Erick, > > > > Probably I really written something silly. You are right on either > sorting > > by field or ranking. > > I just need to change the ranking to shift things around as you said. > > > > To clarify the use case: > > We have a listing aggregator that gets product listings from a lot of > > different sites and since they are added in batches, sometimes you see a > > lot of pages from the same source (site). We are working on some changes > to > > shift things around and reduce this "blocking" effect, so we can present > > mixed sources on the result pages. > > > > I guess I will start with the document random field and later try to > > develop a custom plugin to make things better. > > > > Thanks for the pointers. > > > > Regards, > > Alexandre > > > > On Wed, Jan 11, 2012 at 1:58 PM, Erick Erickson <erickerick...@gmail.com > >wrote: > > > >> I really don't understand what this means: > >> "random sorting for the records but also preserving the ranking" > >> > >> Either you're sorting on rank or you're not. If you mean you're > >> trying to shift things around just a little bit, *mostly* respecting > >> relevance then I guess you can do what you're thinking. > >> > >> You could create your own function query to do the boosting, see: > >> http://wiki.apache.org/solr/SolrPlugins#ValueSourceParser > >> > >> which would keep you from having to re-index your data to get > >> a different "randomness". > >> > >> You could also consider external file fields, but I think your > >> own function query would be cleaner. I don't think math.random > >> is a supported function OOB > >> > >> Best > >> Erick > >> > >> > >> On Wed, Jan 11, 2012 at 8:29 AM, Alexandre Rocco <alel...@gmail.com> > >> wrote: > >> > Hello all, > >> > > >> > Recently i've been trying to tweak some aspects of relevancy in one > >> listing > >> > project. > >> > I need to give a higher score to newer documents and also boost the > >> > document based on a boolean field that indicates the listing has > >> pictures. > >> > On top of that, in some situations we need a random sorting for the > >> records > >> > but also preserving the ranking. > >> > > >> > I tried to combine some techniques described in the Solr Relevancy FAQ > >> > wiki, but when I add the random sorting, the ranking gets messy (as > >> > expected). > >> > > >> > This works well: > >> > > >> > http://localhost:18979/solr/select/?start=0&rows=15&q={!boost%20b=recip(ms(NOW/HOUR,date_updated),3.16e-11,1,1)}active%3a%22true%22+AND+featured%3a%22false%22+_val_:%haspicture%22&fl=*,score > >> > > >> > This does not work, gives a random order on what is already ranked > >> > > >> > http://localhost:18979/solr/select/?start=0&rows=15&q={!boost%20b=recip(ms(NOW/HOUR,date_updated),3.16e-11,1,1)}active%3a%22true%22+AND+featured%3a%22false%22+_val_:%haspicture%22&fl=*,score&sort=random_1+desc > >> > > >> > The only way I see is to create another field on the schema > containing a > >> > random value and use it to boost the document the same way that was > tone > >> on > >> > the boolean field. > >> > Anyone tried something like this before and knows some way to get it > >> > working? > >> > > >> > Thanks, > >> > Alexandre > >> >
