Xapian devel - Mar 2013 - How to add an custom weight to the relevancy value and sort it.

Hello guys,

I have an weight value which is calculated by some factor and i need to add
the weight with the relevancy value of a result and sort it with that value
is that possible in xapian.

Thanks,
VishnuKumar
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Hi Vishnu,

You need to use quest.cc like program and perform your operations on the
mset.

See lines 165-172 of
http://trac.xapian.org/browser/branches/gsoc2011-parth/xapian-core/examples/quest.cc

And you can add your weights to the i.get_weight()->store in a map with
docid and sort it. To sort it you can use something like lines 235-244 of
http://trac.xapian.org/browser/branches/gsoc2011-parth/xapian-letor/examples/questletor.ccwhich
basically calculates new weights for the documents, add it in a
sorted map and reprint it.

Parth.


On Sat, Mar 2, 2013 at 1:11 PM, Vishnu Kumar <vishnu at searchlabs.org>
wrote:
> Hello guys,
>
> I have an weight value which is calculated by some factor and i need to
> add the weight with the relevancy value of a result and sort it with that
> value is that possible in xapian.
>
> Thanks,
> VishnuKumar
>
> _______________________________________________
> Xapian-devel mailing list
> Xapian-devel at lists.xapian.org
> http://lists.xapian.org/mailman/listinfo/xapian-devel
>
>
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On 2 Mar 2013, at 05:11, Vishnu Kumar <vishnu at searchlabs.org> wrote:
> I have an weight value which is calculated by some factor and i need to add
the weight with the relevancy value of a result and sort it with that value is
that possible in xapian.

One way of doing this is using a PostingSource. Docs at
<http://xapian.org/docs/postingsource.html> and
<http://getting-started-with-xapian.readthedocs.org/en/latest/xapian-core-rst/postingsource.html>.

J

-- 
 James Aylett, occasional trouble-maker
 xapian.org

Hi Vishnu :) I think this what you are looking for :-

http://xapian.org/docs/postingsource.html

The documentation and code for the API can be found here :-

http://xapian.org/docs/sourcedoc/html/classXapian_1_1PostingSource.html

-Regards
-Aarsh.



On Sat, Mar 2, 2013 at 5:30 PM, <xapian-devel-request at
lists.xapian.org>wrote:
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> Today's Topics:
>
>    1. How to add an custom weight to the relevancy value        and sort
>       it. (Vishnu Kumar)
>    2. Getting Started (Mohd Azeem)
>    3. Re: Reading a password-protected PDF (Mohd Azeem)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sat, 2 Mar 2013 10:41:49 +0530
> From: Vishnu Kumar <vishnu at searchlabs.org>
> Subject: [Xapian-devel] How to add an custom weight to the relevancy
>         value   and sort it.
> To: xapian-devel at lists.xapian.org
> Message-ID:
>         <
> CADwY5FX9QMuaXW0b59FWbhkRoE_RBP_m8HDtmopoUXuqa9T6PA at mail.gmail.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Hello guys,
>
> I have an weight value which is calculated by some factor and i need to add
> the weight with the relevancy value of a result and sort it with that value
> is that possible in xapian.
>
> Thanks,
> VishnuKumar
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> ------------------------------
>
> Message: 2
> Date: Sat, 2 Mar 2013 19:48:11 +0800 (SGT)
> From: Mohd Azeem <azeem201001 at yahoo.in>
> Subject: [Xapian-devel] Getting Started
> To: xapian <xapian-devel at lists.xapian.org>
> Message-ID:
>         <1362224891.33603.YahooMailNeo at
web190103.mail.sg3.yahoo.com>
> Content-Type: text/plain; charset="utf-8"
>
> Hello all,
> I am Mohd Azeem. I want to contribute in Xapian but I am a newbie here. I
> wonder if anyone could help me in getting started with Xapian. I have some
> basic knowledge of IR and implemented TF*IDF and PageRank schemes, and also
> implemented Inverted Index and Web-Crawler.
>
>
> regards,
> Azeem
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> ------------------------------
>
> Message: 3
> Date: Sat, 2 Mar 2013 19:58:34 +0800 (SGT)
> From: Mohd Azeem <azeem201001 at yahoo.in>
> Subject: Re: [Xapian-devel] Reading a password-protected PDF
> To: Zaim Zuhuri <mzaimz at gmail.com>,     "xapian-devel at
lists.xapian.org"
>         <xapian-devel at lists.xapian.org>
> Message-ID:
>         <1362225514.15504.YahooMailNeo at
web190103.mail.sg3.yahoo.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Hello,
>
> Because the content is encrypted thus the crawler may not see the content.
> But it may provide the search for the document on the basis of metadata
> (name or other metadata info).
>
>
> regards,
> Azeem
>
>
> ________________________________
>  From: Zaim Zuhuri <mzaimz at gmail.com>
> To: xapian-devel at lists.xapian.org
> Sent: Wednesday, 27 February 2013 12:36 PM
> Subject: [Xapian-devel] Reading a password-protected PDF
>
>
> Hello respected developers,
>
> I was wondering if it is possible for xapian to read a password-protected
> PDF. Searches in the archives and google had yield 0 results. I also tried
> looking at the source code but I could not find the specific one related to
> this issue. The characteristic of the set of PDF is as:
>
> 1. a set of password protected PDF documents
> 2. all PDF is set with the same password.
> 3. only the content of the PDF is encrypted, not the metadata.?
>
> If it is possible could you guys point me in the right direction.
>
> Thanks and warm regards,
>
> Zaim Zuhuri
> _______________________________________________
> Xapian-devel mailing list
> Xapian-devel at lists.xapian.org
> http://lists.xapian.org/mailman/listinfo/xapian-devel
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> End of Xapian-devel Digest, Vol 95, Issue 2
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