On 10/16/06, Peter Royle <[EMAIL PROTECTED]> wrote:
> Hi Everyone,
>
> I'm using Ferret 0.10.11 with acts_as_ferret from SVN (same results with
> 0.10.10 and 0.10.9 though).
>
> I'm running into an odd problem where the scores of my top-ranking
> search results are ridiculously small - even when the query is one that
> should match at least one document with a decent score.
>
> To give an example, I have just the names of 5 businesses indexed using
> the standard analyzer. (The same happens with thousands of records
> indexed by many fields but I've simplified for this example). One of
> those businesses is called "ABC Master Building Designers". When I do a
> query for "building" I get "ABC Master Building Designers" as the top
> result, but with the following explanation (via code a added to
> acts_as_ferret for debugging):
>
> QUERY: id:building name:building
>
> EXPLANATION of building: 8.438619e-42 = product of:
> 1.687724e-41 = weight(name:building in 3), product of:
> 0.6125279 = query_weight(name:building), product of:
> 2.386294 = idf(doc_freq=1)
> 0.2566858 = query_norm
> 2.755373e-41 = field_weight(name:building in 3), product of:
> 1.0 = tf(term_freq(name:building)=1)
> 2.386294 = idf(doc_freq=1)
> 1.15467e-41 = field_norm(field=name, doc=3)
> 0.5 = coord(1/2)
>
> Note the tiny score of field_norm which is throwing the whole score out.
> The net result is that all the records aren't differenciated by much and
> so the ordering of the results rarely makes much sense. I sometimes get
> restaurants in the search results!
>
> I haven't used any boost or anything on the name field. My Business
> class calls AaF like this:
>
> class Business < ActiveRecord::Base
>
> acts_as_ferret(
> :fields => { :name => { } },
> :or_default => true
> )
>
> ...
>
> end
>
> Does anyone have any ideas as to what might be causeing this? Any help
> would be greatly appreciated.
Hi Pete,
Are you on a Mac by any chance? There are problems with the scoring on
OS X but I'm not sure why.
Cheers,
Dave
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