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Posted to solr-user@lucene.apache.org by Pierre-Yves LANDRON <pl...@hotmail.com> on 2007/02/28 10:49:42 UTC
how to interpret the Solr score ?
Hello,
A silly question, but I think the subject isn't cover on the Solr wiki :
I'd like to use the score returned by Solr to give the user an estimation of
the response adequacy to his request (ok, that's what the score is for...).
But I cannot figure the meaning of this score : is it a precentage of the
response relevancy ? is it absolute, or relative to others given response ?
Is it the raw Lucene score (perhaps I'm wrong but it doesn't seems it is in
my case) ? Is there a way to obtain a meaningful score ( ie: human readable
) ?
Thanks for reading !
Pierre-Yves Landron
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Re: No segments file after optimizing using Luke
Posted by Yonik Seeley <yo...@apache.org>.
On 4/11/07, Michael Levy <Lu...@gmail.com> wrote:
> After using Luke v0.7 to Optimize Index, with either "Using Standard
> Format" or "Using Compound Format", and restarting Solr using jetty, I
> get a java.io.FileNotFoundException indicating that it can't find the
> segments file.
>
> There's no segments file in the index directory, but Luke optimization
> created files named segments_n (n being 3 for standard format and 6 for
> compound format) and segments.gen.
>
> How can I resolve this? Thanks in advance!
If you are going to use another program to modify a Solr-Lucene index,
make sure that program is using the same version of Lucene that Solr
is :-)
The very latest version of Luke uses Lucene 2.1, which is later than
Solr1.1 uses.
Try using a nightly build of Solr.
-Yonik
No segments file after optimizing using Luke
Posted by Michael Levy <Lu...@gmail.com>.
After using Luke v0.7 to Optimize Index, with either "Using Standard
Format" or "Using Compound Format", and restarting Solr using jetty, I
get a java.io.FileNotFoundException indicating that it can't find the
segments file.
There's no segments file in the index directory, but Luke optimization
created files named segments_n (n being 3 for standard format and 6 for
compound format) and segments.gen.
How can I resolve this? Thanks in advance!
Re: how to interpret the Solr score ?
Posted by Yonik Seeley <yo...@apache.org>.
On 3/1/07, Pierre-Yves LANDRON <pl...@hotmail.com> wrote:
> I haven't seen that maxScore you're speaking about. It's exactly what I
> needed.
It's an attribute in <result> when you elect to return scores.
<?xml version="1.0" encoding="UTF-8"?>
<response>
<lst name="responseHeader">
<int name="status">0</int>
<int name="QTime">0</int>
<lst name="params">
<str name="fl">score,*</str>
<str name="q">ipod</str>
<str name="indent">on</str>
</lst>
</lst>
<result name="response" numFound="3" start="0" maxScore="2.4851787">
<doc>
<float name="score">2.4851787</float>
<arr name="cat"><str>electronics</str><str>connector</str></arr>
<arr name="features"><str>car power adapter for iPod, white</str></arr>
<str name="id">IW-02</str>
<bool name="inStock">false</bool>
<str name="manu">Belkin</str>
<str name="name">iPod & iPod Mini USB 2.0 Cable</str>
<int name="popularity">1</int>
<float name="price">11.5</float>
<str name="sku">IW-02</str>
<date name="timestamp">2007-01-31T05:12:44.484Z</date>
<float name="weight">2.0</float>
</doc>
<doc>
[...]
Re: how to interpret the Solr score ?
Posted by Pierre-Yves LANDRON <pl...@hotmail.com>.
Thank you Yonik,
I haven't seen that maxScore you're speaking about. It's exactly what I
needed.
Cheers,
P-Y L
>From: "Yonik Seeley" <yo...@apache.org>
>Reply-To: solr-user@lucene.apache.org
>To: solr-user@lucene.apache.org
>Subject: Re: how to interpret the Solr score ?
>Date: Wed, 28 Feb 2007 12:31:34 -0500
>
>On 2/28/07, Pierre-Yves LANDRON <pl...@hotmail.com> wrote:
>>A silly question, but I think the subject isn't cover on the Solr wiki :
>>I'd like to use the score returned by Solr to give the user an estimation
>>of
>>the response adequacy to his request (ok, that's what the score is
>>for...).
>>But I cannot figure the meaning of this score : is it a precentage of the
>>response relevancy ? is it absolute, or relative to others given response
>>?
>>Is it the raw Lucene score (perhaps I'm wrong but it doesn't seems it is
>>in
>>my case) ? Is there a way to obtain a meaningful score ( ie: human
>>readable
>>) ?
>
>It's the raw lucene score. Some lucene functions normalize the score
>by dividing all scores by the top score in matching documents, if that
>top score is greater than 1. Solr also returns maxScore so you can do
>the same if you desire.
>
>-Yonik
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Re: how to interpret the Solr score ?
Posted by Yonik Seeley <yo...@apache.org>.
On 2/28/07, Pierre-Yves LANDRON <pl...@hotmail.com> wrote:
> A silly question, but I think the subject isn't cover on the Solr wiki :
> I'd like to use the score returned by Solr to give the user an estimation of
> the response adequacy to his request (ok, that's what the score is for...).
> But I cannot figure the meaning of this score : is it a precentage of the
> response relevancy ? is it absolute, or relative to others given response ?
> Is it the raw Lucene score (perhaps I'm wrong but it doesn't seems it is in
> my case) ? Is there a way to obtain a meaningful score ( ie: human readable
> ) ?
It's the raw lucene score. Some lucene functions normalize the score
by dividing all scores by the top score in matching documents, if that
top score is greater than 1. Solr also returns maxScore so you can do
the same if you desire.
-Yonik