Markus,
The calculation is correct.
Look at your output.
Result = queryWeight(text:gb) * fieldWeight(text:gb in 1)
Result = (idf(docFreq=6, numDocs=26) * queryNorm) *
(tf(termFreq(text:gb)=2) * idf(docFreq=6, numDocs=26) *
fieldNorm(field=text, doc=1))
This you should notice that idf(docFreq=6
The example does not include the evidence. But we do use eDisMax for
scoring in Solr.
The following is from solrconfig.xml:
edismax
Here is a short snippet of the explained result, where 0.1 is the Tie
breaker in DisMax/eDisMax.
6.446447 = (MATCH) max plus 0.1 times others of:
0.63826215
: Thanks! What's the procedure to report this if it's a bug?
: EDisMax has similar behavior.
what yo uare seeing isn't specific to dismax & edismax (in fact: there's
no evidence in your example that dismax is even being used)
what you are seeing is the basic scoring of a TermQuery using the
D
Ok, here is the calculation of the score:
0.18314168 = *2.3121865* * 0.15502669 * 1.4142135 * *2.3121865* * 0.15625
*2.3121865 is *multiplied twice here. That is what I mean tf x idf^2 is
used instead of tf x idf.
On Wed, Oct 5, 2011 at 10:42 AM, Markus Jelsma
wrote:
> Hi,
>
> I don't see
Hi,
I don't see 2.3121865 * 2 anywhere in your debug output or something that
looks like that.
> Hi Markus,
>
> The idf calculation itself is correct.
> What I am trying to understand here is why idf value is multiplied twice
> in the final score calculation. Essentially, tf x idf^2 is used
Hi Markus,
The idf calculation itself is correct.
What I am trying to understand here is why idf value is multiplied twice in
the final score calculation. Essentially, tf x idf^2 is used instead of tf
x idf.
I'd like to understand the rational behind that.
On Wed, Oct 5, 2011 at 9:43 AM, Ma
In Lucene's default similarity idf = 1 + ln (numDocs / df + 1).
1 + ln(26 / 7) =~ 2.3121865
I don't see a problem.
> Hi,
>
>
> When I examine the score calculation of DisMax in Solr, it looks to me
> that DisMax is using tf x idf^2 instead of tf x idf.
> Does anyone have insight why tf x id
Thanks! What's the procedure to report this if it's a bug?
EDisMax has similar behavior.
On Tue, Oct 4, 2011 at 11:24 PM, Bill Bell wrote:
> This seems like a bug to me.
>
> On 10/4/11 6:52 PM, "David Ryan" wrote:
>
> >Hi,
> >
> >
> >When I examine the score calculation of DisMax in Solr, it
This seems like a bug to me.
On 10/4/11 6:52 PM, "David Ryan" wrote:
>Hi,
>
>
>When I examine the score calculation of DisMax in Solr, it looks to me
>that DisMax is using tf x idf^2 instead of tf x idf.
>Does anyone have insight why tf x idf is not used here?
>
>Here is the score contributio
Hi,
When I examine the score calculation of DisMax in Solr, it looks to me
that DisMax is using tf x idf^2 instead of tf x idf.
Does anyone have insight why tf x idf is not used here?
Here is the score contribution from one one field:
score(q,c) = queryWeight x fieldWeight
=
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