You can tweak the parameters of BM25 similarity:
https://solr.apache.org/docs/8_1_1/solr-core/org/apache/solr/search/similarities/BM25SimilarityFactory.html
IIRC, the similarity becomes a constant with k1 = 0.
<similarity class="solr.BM25SimilarityFactory">
<float name="k1">0</float>
</similarity>
Thomas
Op do 14 apr. 2022 om 15:51 schreef Vincenzo D'Amore <v.dam...@gmail.com>:
> https://github.com/freedev/solr-constant-similarity
>
> this is just an implementation of what Markus was suggesting.
>
> Could be a good idea adding a constant similarity class into the solr
> standard distribution.
>
> On Thu, Apr 14, 2022 at 3:48 PM Vincenzo D'Amore <v.dam...@gmail.com>
> wrote:
>
> > Hi,
> >
> > long time ago I wrote this, just trying to handle cases where there is no
> > need TF/IDF
> >
> > https://github.com/freedev/solr-constant-similarity
> >
> > There just two simple steps to follow:
> >
> > 1. Add this line in solrconfig.xml:
> >
> > <lib dir="../../../dist/" regex="constant-similarity-\d.*\.jar" />
> >
> > 1. And add this line into schema.xml:
> >
> > <similarity
> > class="it.damore.solr.similarity.ConstantTFSimilarity"></similarity>
> >
> >
> > <
> https://github.com/freedev/solr-constant-similarity#old-solr-versions-before-54
> >
> >
> > On Thu, Apr 14, 2022 at 3:30 PM Jeremy Buckley - IQ-C
> > <jeremy.buck...@gsa.gov.invalid> wrote:
> >
> >> You may be interested in the ^= modifier for queries. From the
> reference
> >> guide:
> >>
> >> Constant Score with "^="
> >>
> >> Constant score queries are created with <query_clause>^=<score>, which
> >> sets
> >> the entire clause to the specified score for any documents matching that
> >> clause. This is desirable when you only care about matches for a
> >> particular
> >> clause and don’t want other relevancy factors such as term frequency
> (the
> >> number of times the term appears in the field) or inverse document
> >> frequency (a measure across the whole index for how rare a term is in a
> >> field).
> >>
> >> Example:
> >>
> >> (description:blue OR color:blue)^=1.0 text:shoes
> >>
> >>
> >> On Thu, Apr 14, 2022 at 8:52 AM Fiz N <fiznewy...@gmail.com> wrote:
> >>
> >> > Hello Experts,
> >> >
> >> > In our project we are using SOLR 8.11.1 in Standalone mode in Windows
> >> > server box.
> >> >
> >> > We have implemented a search mechanism by using pure keyword match and
> >> > boosting the keywords as per business needs. For each search result,
> >> match
> >> > percentage is derived using the obtained SOLR document score. The SOLR
> >> > document score is the summation of individual keyword scores which is
> >> > derived by using boost factor and TF/IDF values of the keyword.
> >> >
> >> > As per requirements, in our case the resultant scores should be
> >> dependent
> >> > only on the boost factor, whereas the implicit TF/IDF factor is
> causing
> >> > deviation in the expected results and also causing uncertainty in the
> >> > resultant ranking.
> >> >
> >> > So we are looking for better approaches to eliminate/neutralize the
> SOLR
> >> > TF/IDF factor.
> >> >
> >> > Please do let us know your suggestions in removal of TF/IDF factor or
> >> any
> >> > other solution approach that we can consider in this case.
> >> >
> >> > Thanks
> >> > Fiz Fareedh.
> >> >
> >>
> >
> >
> > --
> > Vincenzo D'Amore
> >
> >
>
> --
> Vincenzo D'Amore
>
