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From Vikas Gupta <vgu...@cs.utexas.edu>
Subject Re: document boost not showing up in Explanation
Date Tue, 28 Dec 2004 03:12:20 GMT
You can checkout the nutch search engine(with my modifications) at:

http://cofferdam.cs.utexas.edu:8080

You can search by computer science related terms there(it searches the CS
dept at Univ. of Texas at Austin)

To get a sample explanation:

enter a search query and click on 'explanation' in the results.

Thanks.

On Mon, 27 Dec 2004, Vikas Gupta wrote:

> I am using lucene-1.4.1.jar(with nutch). For some reason, the effect of
> document boost is not showing up in the search results. Also, why is it
> not a part of the Explanation
>
>     Below is the 'explanation' of a sample query "solar". I don't see the
> boost value (1.5514448) being used at all in the calculation of the
> document score - from the 'explanation' below and also from the quality of
> the search.
>
>     How can I see the effect of document boost?
>
>     Thanks.
>
> -Vikas
>
> --------------- a sample explanation ------------
> page
> docNo = 0
> segment = 20041224185557
> digest = 18cef64c6c53ecf399abfd9239caf240
>
> ----> boost = 1.5514448 <----(Vikas: not used in the calculation below)
>
> lang = en
> url = http://www.cs.utexas.edu/users/vgupta/web1/a31.html
> anchor = Solar System jigsaw
> anchor = a31.html
> anchor = Solar System jigsaw
> title = Solar System jigsaw
> H1 = Solar System jigsaw
>
> score for query: solar
> 0.7634825 = sum of:
>  0.5878681 = weight(anchor:solar^2.0 in 0), product of:
>  0.3017718 = queryWeight(anchor:solar^2.0), product of:
>  2.0 = boost
>  2.2039728 = idf(docFreq=2)
>  0.06846087 = queryNorm
>  1.9480551 = fieldWeight(anchor:solar in 0), product of:
>  1.4142135 = tf(termFreq(anchor:solar)=2)
>  2.2039728 = idf(docFreq=2)
>  0.625 = fieldNorm(field=anchor, doc=0)
>  0.010230478 = weight(content:solar in 0), product of:
>  0.09287914 = queryWeight(content:solar), product of:
>  1.3566749 = idf(docFreq=6)
>  0.06846087 = queryNorm
>  0.11014828 = fieldWeight(content:solar in 0), product of:
>  1.7320508 = tf(termFreq(content:solar)=3)
>  1.3566749 = idf(docFreq=6)
>  0.046875 = fieldNorm(field=content, doc=0)
>  0.16538392 = weight(H1:solar^1.5 in 0), product of:
>  0.1393187 = queryWeight(H1:solar^1.5), product of:
>  1.5 = boost
>  1.3566749 = idf(docFreq=2)
>  0.06846087 = queryNorm
>  1.1870905 = fieldWeight(H1:solar in 0), product of:
>  1.0 = tf(termFreq(H1:solar)=1)
>  1.3566749 = idf(docFreq=2)
>  0.875 = fieldNorm(field=H1, doc=0)
>
>
>
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