[Xapian-discuss] Relevance wdf

Richard Boulton richard at tartarus.org
Fri Mar 18 14:20:03 GMT 2005

On Fri, 2005-03-18 at 13:50 +0000, James Aylett wrote:
> > Is it possible that get desired result with Xapian?
> If you add a dummy term you never search over with a wdf such that all
> document lengths are the same, that might do it. However it will stop
> the normal relevance mechanism from working, and will probably cause
> you other problems further down the line.

Or, you could perform your match using different parameters for the BM25
weighting function, such that document length is ignored.  Try using a
BM25Weight object with the k2 and b parameters to the constructor set to

(See the documentation of Enquire::set_weighting_scheme() at

and the documentation of the BM25weight class at

Richard Boulton <richard at tartarus.org>

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