Joel and Erick,
Thank you very much for explaining how the ReRanking works. Now
its a bit more clear.
Thanks,
Ravi Kiran Bhaskar
On Sun, Sep 7, 2014 at 4:45 PM, Joel Bernstein <joels...@gmail.com> wrote:
> Oops wrong usage pattern. It should be:
>
> 1) Main query is sorted by a field (scores tracked silently in the
> background).
> 2) Reranker is reRanking docs based on the score from the main query.
>
>
>
> Joel Bernstein
> Search Engineer at Heliosearch
>
>
> On Sun, Sep 7, 2014 at 4:43 PM, Joel Bernstein <joels...@gmail.com> wrote:
>
> > Ok, just reviewed the code. The ReRankingQParserPlugin always tracks the
> > scores from the main query. So this explains things. Speaking of
> explaining
> > things, the ReRankingParserPlugin also works with Lucene's explain. So if
> > you use debugQuery=true we should see that the score from the initial
> query
> > was combined with the score from the reRankQuery, which should be 1.
> >
> > You have stumbled on a interesting usage pattern which I never
> considered.
> > But basically what's happening is:
> >
> > 1) Main query is sorted by score.
> > 2) Reranker is reRanking docs based on the score from the main query.
> >
> > No, worries Erick, you've taught me a lot over the past couple of years!
> >
> >
> >
> >
> >
> >
> >
> >
> > Joel Bernstein
> > Search Engineer at Heliosearch
> >
> >
> > On Sun, Sep 7, 2014 at 11:37 AM, Erick Erickson <erickerick...@gmail.com
> >
> > wrote:
> >
> >> Joel:
> >>
> >> I find that whenever I say something totally wrong publicly, I
> >> remember the correction really really well...
> >>
> >> Thanks for straightening that out!
> >> Erick
> >>
> >> On Sat, Sep 6, 2014 at 12:58 PM, Joel Bernstein <joels...@gmail.com>
> >> wrote:
> >> > This folllowing query:
> >> >
> >> > http://localhost:8080/solr/select?q=malaysian airline
> crash&rq={!rerank
> >> > reRankQuery=$rqq reRankDocs=1000}&rqq=*:*&sort=publish_date
> >> > desc&fl=headline,publish_date,score
> >> >
> >> > Is doing the following:
> >> >
> >> > The main query is sorted by publish_date. Then the results are
> reranked
> >> by
> >> > *:*, which in theory would have no effect at all.
> >> >
> >> > The reRankQuery only uses the reRankQuery to re-rank the results. The
> >> sort
> >> > param will always apply to the main query.
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> > Joel Bernstein
> >> > Search Engineer at Heliosearch
> >> >
> >> >
> >> > On Sat, Sep 6, 2014 at 2:33 PM, Ravi Solr <ravis...@gmail.com> wrote:
> >> >
> >> >> Erick,
> >> >> Your idea about reversing Joel's suggestion seems to give the
> >> best
> >> >> results of all the options I tried...but I cant seem to understand
> >> why. I
> >> >> thought the query shown below should give irrelevant results as
> >> sorting by
> >> >> date would throw relevancy off...but somehow its getting relevant
> >> results
> >> >> with fair enough reverse chronology. It is as if the sort is applied
> >> after
> >> >> the docs are collected and reranked (which is what I wanted). One
> more
> >> >> thing that baffled me was, if I change reRankDocs from 1000 to100 the
> >> >> results become irrelevant, which doesnt make sense.
> >> >>
> >> >> So can you kindly explain whats going on in the following query.
> >> >>
> >> >> http://localhost:8080/solr/select?q=malaysian airline
> >> crash&rq={!rerank
> >> >> reRankQuery=$rqq reRankDocs=1000}&rqq=*:*&sort=publish_date
> >> >> desc&fl=headline,publish_date,score
> >> >>
> >> >> I love the solr community, so much to learn from so many
> knowledgeable
> >> >> people.
> >> >>
> >> >> Thanks
> >> >>
> >> >> Ravi Kiran Bhaskar
> >> >>
> >> >>
> >> >>
> >> >> On Fri, Sep 5, 2014 at 1:23 PM, Erick Erickson <
> >> erickerick...@gmail.com>
> >> >> wrote:
> >> >>
> >> >> > OK, why can't you switch the clauses from Joel's suggestion?
> >> >> >
> >> >> > Something like:
> >> >> > q=Malaysia plane crash&rq={!rerank reRankDocs=1000
> >> >> > reRankQuery=$myquery}&myquery=*:*&sort=date+desc
> >> >> >
> >> >> > (haven't tried this yet, but you get the idea....).
> >> >> >
> >> >> > Best,
> >> >> > Erick
> >> >> >
> >> >> > On Fri, Sep 5, 2014 at 9:33 AM, Markus Jelsma
> >> >> > <markus.jel...@openindex.io> wrote:
> >> >> > > Hi - You can already achieve this by boosting on the document's
> >> >> recency.
> >> >> > The result set won't be exactly ordered by date but you will get
> the
> >> most
> >> >> > relevant and recent documents on top.
> >> >> > >
> >> >> > > Markus
> >> >> > >
> >> >> > > -----Original message-----
> >> >> > >> From:Ravi Solr <ravis...@gmail.com <mailto:ravis...@gmail.com>
> >
> >> >> > >> Sent: Friday 5th September 2014 18:06
> >> >> > >> To: solr-user@lucene.apache.org <mailto:
> >> solr-user@lucene.apache.org>
> >> >> > >> Subject: Re: Query ReRanking question
> >> >> > >>
> >> >> > >> Thank you very much for responding. I want to do exactly the
> >> opposite
> >> >> of
> >> >> > >> what you said. I want to sort the relevant docs in reverse
> >> chronology.
> >> >> > If
> >> >> > >> you sort by date before hand then the relevancy is lost. So I
> >> want to
> >> >> > get
> >> >> > >> Top N relevant results and then rerank those Top N to achieve
> >> relevant
> >> >> > >> reverse chronological results.
> >> >> > >>
> >> >> > >> If you ask Why would I want to do that ??
> >> >> > >>
> >> >> > >> Lets take a example about Malaysian airline crash. several
> >> articles
> >> >> > might
> >> >> > >> have been published over a period of time. When I search for -
> >> >> malaysia
> >> >> > >> airline crash blackbox - I would want to see "relevant" results
> >> but
> >> >> > would
> >> >> > >> also like to see the the recent developments on the top i.e.
> >> >> > effectively a
> >> >> > >> reverse chronological order within the relevant results, like
> >> telling
> >> >> a
> >> >> > >> story over a period of time
> >> >> > >>
> >> >> > >> Hope i am clear. Thanks for your help.
> >> >> > >>
> >> >> > >> Thanks
> >> >> > >>
> >> >> > >> Ravi Kiran Bhaskar
> >> >> > >>
> >> >> > >>
> >> >> > >> On Thu, Sep 4, 2014 at 5:08 PM, Joel Bernstein <
> >> joels...@gmail.com
> >> >> > <mailto:joels...@gmail.com> > wrote:
> >> >> > >>
> >> >> > >> > If you want the main query to be sorted by date then the top N
> >> docs
> >> >> > >> > reranked by a query, that should work. Try something like
> this:
> >> >> > >> >
> >> >> > >> > q=foo&sort=date+desc&rq={!rerank reRandDocs=1000
> >> >> > >> > reRankQuery=$myquery}&myquery=blah
> >> >> > >> >
> >> >> > >> >
> >> >> > >> > Joel Bernstein
> >> >> > >> > Search Engineer at Heliosearch
> >> >> > >> >
> >> >> > >> >
> >> >> > >> > On Thu, Sep 4, 2014 at 4:25 PM, Ravi Solr <ravis...@gmail.com
> >> >> > <mailto:ravis...@gmail.com> > wrote:
> >> >> > >> >
> >> >> > >> > > Can the ReRanking API be used to sort within docs retrieved
> >> by a
> >> >> > date
> >> >> > >> > field
> >> >> > >> > > ? Can somebody help me understand how to write such a query
> ?
> >> >> > >> > >
> >> >> > >> > > Thanks
> >> >> > >> > >
> >> >> > >> > > Ravi Kiran Bhaskar
> >> >> > >> > >
> >> >> > >> >
> >> >> > >>
> >> >> > >
> >> >> >
> >> >>
> >>
> >
> >
>
