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From David Ryan <help...@gmail.com>
Subject Re: idf calculation in Lucene ?
Date Mon, 31 Oct 2011 21:24:18 GMT
Thanks!  Is there any way to extend the Similarity class to overwrite the
behavior (e.g.,  using the max idf instead of the sum of each term idfs)?


On Thu, Oct 27, 2011 at 5:41 AM, Robert Muir <rcmuir@gmail.com> wrote:

> On Thu, Oct 20, 2011 at 3:11 PM, David Ryan <helponr@gmail.com> wrote:
>
> >
> > However, in some case,  when I search o'reilly ,  I see
> >
> >  *  44.0865 = idf(title: o''reilli=4 o=1488 reilli=14 oreilli=4)*
> >
> > In this cae, How is IDF calculated?
> >
>
> thats a phrase or multiphrase query.
>
> in this case it sums up the idf of each term:
>
> http://lucene.apache.org/java/3_4_0/api/all/org/apache/lucene/search/Similarity.html#idfExplain(java.util.Collection
> ,
> org.apache.lucene.search.Searcher)
>
> --
> lucidimagination.com
>
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