similar to: scoring question

Hi, I'm trying to use custom weight with python binding. My test code is like this. class TinkerWeight(xapian.Weight): def __init__(self): pass def name(self): return "Tinker" def serialize(self): return "" def get_sumpart(*args): return 1 def get_maxpart(*args): return 1 def get_sumextra(*args):

Hello guys.I just read up about tf-idf schemes and want to implement it in Xapian (with some frequently used normalizations) as it will also give me a good hang of implementing a weighting scheme before I start working on implementing DFR schemes. I read the following as references and I think Ive understood it well and can write the hack :- 1.)

Hello guys.I have begun work on writing my proposal as discussed on IRC and will submit a draft in a couple of days so that I can make it detailed and refine it after getting feedback. I wanted to know about the number of weeks a proposal should cover and also,is it okay if I set aside a buffer week somewhere in the middle of the summer for something like cleaning the code,working on the

For unsupervised approaches like BM25 this approach works well but letor does not need special weighting for title in this form as it itself assigns weights to title features separately. But I see your concern it would be a problem when BM25 is used on the index with this setup. Hence its preferable to take a note of this uplift in title weight for xapian-letor and normalize it everywhere

Hi Xapianers: My name is Weixian Zhou, Computer Science student of University at Buffalo, State University of New York. I am interested in the project of posting list encoding improvements and weighting schemes. I have some questions toward them. 1) After read the comments in brass_postlist.cc, I am still not very clear about the detailed structure of postings list. If you can provide some simple

On Tue, Aug 20, 2013 at 07:28:42PM +0800, jiangwen jiang wrote: > I think norm(t, d) in Lucene can used to caculate the number which is > similar to doc length(see norm(t,d) in > http://lucene.apache.org/core/3_5_0/api/all/org/apache/lucene/search/Similarity.html#formula_norm). It sounds similar (especially if document and field boosts aren't in use), though some places may rely on

Hi, I'm Michael, I would like to participate in this year's Google Summer of Code, and I picked Xapian as the project to code for. Before writing a full proposal, I want to get in contact with the community, as well as introducing myself and discuss my ideas for the contribution to Xapian. First of all I'd like to talk about my motivation. I'm currently working on a webapp

Hi, I'm Michael, I would like to participate in this year's Google Summer of Code, and I picked Xapian as the project to code for. Before writing a full proposal, I want to get in contact with the community, as well as introducing myself and discuss my ideas for the contribution to Xapian. First of all I'd like to talk about my motivation. I'm currently working on a webapp

I am having a problem letting users mount there samba shares. The root user has no problem mounting . But regular users get the error "mount: only root can do that " when trying to execute the following. mount -rw -t smbfs //jelly-bean-iii/E /home/ca43887/E Any help is appreciated. Thanks, Charles

Hi all Is there a way to do adaptive query scoring (as in popular results returned by a query should get more weight because they are getting clicked more often) in xapian? Is this what the rset class should be used for? I could write a php app to do adaptive results scoring for separate words (just recording the clicks and then have a cron:ned script add weight to the document_id:s for the

Dear LLVM user and developer, We get a chance to give a tutorial on LLVM and MCLinker. The tutorial will be co-located with CGO 2013 on Feb. 24 (Sunday morning) in Shenzhen, China. If you are also interesting in these topics, welcome to join the tutorial! Here is a website of the tutorial: http://code.google.com/p/mclinker/ We're also looking for additional presenters to share a

HI, all, I am a user of Xapian, and now I have a problem in using it. After using boolean terms to get some candidates of documents (still too much), we want sorted them by self-defined function which is used in Xapian::KeyMaker->operator(). But how can I get the serialise score in Xapian::MSetIterator object. c++ code likes this: class SortKeyMaker : public Xapian::KeyMaker { std::string

Hi Olly, Wouldn't setting the weight of terms in title back to normal (e.g. 5 to 1) by below line, automatically adjust the wdfs and field lengths? indexer.index_text(title, 5, "S"); -> indexer.index_text(title, 1, "S"); if it does not then we should include that part in the patch too. I like to create a patch for xapian-letor for resolving common code of xapian.

On Sun, Apr 09, 2017 at 11:34:07PM +0530, Vivek Pal wrote: > > Each scheme already has a human-readable name, and Xapian::Registry > > can map that to an "examplar" object of the right type, so we > > could take a string like "bm25 1 0.8", see the first word is "bm25" > > and get a BM25Weight object, then call parse_params("1 0.8") on

On Mon, Aug 26, 2013 at 09:41:07AM +0800, jiangwen jiang wrote: > > For now, using weighting schemes which don't use document length is > > probably the simplest answer. > > There's tf-idf weighting scheme on svn master, is it suitable for lucene > backend? Yes - TfIdfWeight doesn't ever use the document length (at least with the normalisations currently

Hi, I am Abhishek Currently Xapian::Weight follows BM25 scheme, many models such as the Divergence from Randomness (DfR) family of models, Unigram Language Model and the Bi-gram Language Model implemented two years ago in GSoc 2012 yet not merged to the master. The new weighing schemes or improvement in implementing the previous models to change the default scheme of BM25 from SMART with

On Sat, Apr 08, 2017 at 09:11:22PM +0100, James Aylett wrote: > On 8 Apr 2017, at 19:15, Vivek Pal <vivekpal.dtu at gmail.com> wrote: > > >> and the details of which weighting schemes were available in which version > >> isn't a key part of the $set command itself. > > > > Do you suggest dropping that piece of information out? Since the reason behind

Hi All, I am interested in applying for the two projects listed in the Xapian Gsoc 2019 project idealist: "Learning to Rank Stabilisation" and "Weighting Schemes". I have downloaded the codebase and going through some of the commits related to Letor API, BM25, and DFR weighting schemes. Can anyone tell me how to write about the formal proposal for the above-mentioned projects?

Hi, all: I have wrote a demo patch for Backend for Lucene format indexes, Lucene version is 3.6.2. http://lucene.apache.org/core/3_6_2/fileformats.html Now, this demo patch just support the basic features in Lucene. Compound File(.cfs/.cfe)?term vector(.tvx/.tvd/.tvf) delete document(.del) are not supported, skip list in .fdx is not supported too example/quest.cc is used to test this demo.

We have a corpus of academic papers. Sometimes it happens that there is an academic controversy and one paper is a response or rebuttal to another paper. The name of the author of the first paper may appear many times in the second paper. So in light of this, how should we set our weight on the author field? Here is an example: http://www.nber.org/papers/w11215  in which the term