similar to: Letor: returning MSet after re-ranking

On Sun, Jul 31, 2016 at 12:44:16AM +0100, Olly Betts wrote: > Would a method which swapped two elements of an MSet provide what you > need? That would provide a more generic way to adjust the ranking of > an MSet which for example could be used to implement a diversification > feature or something like SQL "GROUP BY". Isn't the most common use going to be that the

> > > > The approach I was thinking would look something like this: > > * instead of Features, which is really a namespace implemented as a > class, we separate out the calculation of the different features > into distinct subclasses of Feature, whose only job is to calculate > a single feature. Currently the FeatureManager calls these (via >

Hello, I am Uppinder Chugh (irc nick: icebyte), a senior year undergraduate student majoring in Computer Science and Engineering at Indian Institute of Technology, Guwahati. I'm interested to work on the idea of adding the functionality of search result diversification to Xapian. After having brief conversations with mentors on IRC, I would like to compile the discussions and further discuss

Hi all, Thank you for giving me the opportunity to work with Xapian :) I am Jiarong Wei, a third year undergraduate student in Zhejiang University, China. In GSoC 2014, I will work on Letor module with Hanxiao Sun. Here are some questions I encountered these days, 1. In letor.cc, we have two parts of functions: the training part and the ranking part. I?ll use SVMRanker as an example. The

On Thu, Aug 17, 2023 at 09:28:26PM +0000, Eric Wong wrote: > In other words, is it possible to avoid duplicates if new > documents are inserted into the DB by another process in-between > ->get_mset calls when reusing Xapian::Enquire objects? The Database object itself effectively does (it works in a snapshot of the state of the database when you open it, or last called reopen() which

In other words, is it possible to avoid duplicates if new documents are inserted into the DB by another process in-between ->get_mset calls when reusing Xapian::Enquire objects? I do some expensive processing on each mset window, so I always limit the results to limit heap usage even if I'm planning on going through a big chunk of the DB: $mset = $enq->get_mset(0, 1000);

We are equally excited about working with you over summer. I think you missed reply by Olly on IRC, you can find it in logs here: https://botbot.me/freenode/xapian/2018-04-24/?msg=99336093&page=1 - olly icebyte[m]: i think that probably needs to go through SFC ( https://sfconservancy.org/) as the "legal entity" - 2:05 am

Olly Betts <olly at survex.com> wrote: > On Wed, Aug 23, 2023 at 01:53:27PM +0000, Eric Wong wrote: > > I'm already retrying the ->get_mset operations; but now I'm > > wondering where I'd hit DatabaseModifiedErrors while inside a > > Xapian::MSetIterator loop. > > > > I assume ->get_document is a place where it gets thrown; > > but

Hello, I'm Ayush from New Delhi, India. I am interested in Letor Stabilisation project for GSoC. I have a good background in machine learning. Sorry for getting in so late, university exams were holding me back. I'll try to cover as much as I can in the coming week. I am following the plan of attack suggested on the project page. Following are the things that I have completed: 1.

Hi, is there a way to get the number of all possible matches for a specific query? Some api call like Xapian::doccount Xapian::Enquire::get_number_of_matches(); Best wishes Wilm

Hi Olly. Thanks for your reply to the previous email. To have an appropriate subject I've started this new thread for further discussions. > There's a $log{} command available in Omega templates. We can't log from > the result page template, as the clicks happen after that is used, but we > could make result links redirect via a second Omega template which does > the

Hi, I'm using xapian with c# and mono and i'm having a segfault in get_weight. When i print the index variable, the value is clearly too high. I think something write over it. Do you have any idea on how i could trace the beginning of the segmentation fault ? Thanks, -- Yann

Hi Rishabh, I think its better not to expose RankiList to Letor.h and make it better user friendly. So my suggestion is to convert RankList to the following statement in this method. std::map<Xapian::docid, double> letor_score(const Xapian::MSet & mset); So just convert the RankList in std::map<Xapian::docid, double> format in the methods where you need to return. Parth. On

Hi all, While building from git with xapian-letor not ignored in bootstrap, I am getting the following make error: In function `main': /home/ayush/Desktop/xapian/xapian-letor/bin/xapian-letor-update.cc:98: undefined reference to `Xapian::Internal::str(unsigned int)' /home/ayush/Desktop/xapian/xapian-letor/bin/xapian-letor-update.cc:99: undefined reference to

1.Could you explain why are these libraries included in all the xapian-letor headers? #include<xapian/intrusive_ptr.h> #include<xapian/types.h> #include<xapian/visibility.h> Or just provide me with the documentation of these header. I looked into these header files but couldn't anything substantial. 2.

I've traced a memory leak to a statement which assigns the values from an MSetItem to a dictionary which is then appended to a list in python. We're running python 2.7.3, xapian-core 1.2.15 and xapian-bindings 1.2.15. I've provided an example which reproduces the behavior below. The example prints the PID and has a few statements waiting for input to make observing the behavior easier.

On Wed, Aug 23, 2023 at 01:53:27PM +0000, Eric Wong wrote: > I'm already retrying the ->get_mset operations; but now I'm > wondering where I'd hit DatabaseModifiedErrors while inside a > Xapian::MSetIterator loop. > > I assume ->get_document is a place where it gets thrown; > but once a document is retrieved, can iterating through > terms in one document

Hello, I wanted to decide the dataset that should be used for Letor stabilisation project. I think 2009 INEX Wikipedia Collection <http://www.mpi-inf.mpg.de/departments/databases-and-information-systems/software/inex/> should work fine. It's a collection of 2,666,190 XML articles, 115 topics <http://inex.mmci.uni-saarland.de/protected/adhoc/2009-topics.zip>, 50,275 qrel

Hello James, Parth, Following our discussion on IRC and on code review, the way FeatureVector class works needs some discussion. Presently, the FeatureVector class is defined as follows, with a fixed number of feature count (19): class FeatureVector::Internal : public Xapian::Internal::intrusive_base{ friend class FeatureVector; double label; double score;

Hello James, I am working on breaking down Features into sub-classes. Should each of the features get their own sub-class, or should the grouping be done according to type? i.e. query-document pair dependent, query-dependent and document dependent sub-classes. Using this approach makes more sense if we plan to add support for user to include query-dependent and document-dependent features in