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...ds have been implemented in the current module)? And how about the cross validation for the training set? Is there any method included in the current project? For SVM method, I found letor_learn_model() has been commented out, but I didn't find any other file contain this function (or maybe in letor_internal.cc)? Finally I found a file called letor_internal_refactored.cc file, is that the latest version of letor_internal.cc ? Is letor_internal.cc still being used? Thank you very much. I am waiting for your reply. -- Jia Xu -------------- next part -------------- An HTML attachment was scrubbed......

.../letor.h#L41>is the class Letor::Internal intentionally named same as this Internal<https://github.com/xapian/xapian/blob/99eed23ae87bb96f5f9ee7e14a62e9f4af04af0c/xapian-core/include/xapian/intrusive_ptr.h#L44>namespace or is it just a coincidence? 3. If I am not wrong we want to dissolve letor_internal to create SVMRanker. So accordingly letor,h will also change. Right? Thanks -Mayank -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.xapian.org/pipermail/xapian-devel/attachments/20140310/89ac3f89/attachment-0002.html>

Hi, I've read the code of letor module. And I have some questions about it: 1. In https://github.com/rishabhmehrotra/xapian/blob/master/xapian-letor/letor_internal.cc#L299, there is a write_to_file method, which save RankList into ?train.txt?. But the format for ?train.txt? is different from the one mentioned in http://trac.xapian.org/wiki/GSoC2011/LTR/Notes#QueryLevelNorm. And in https://github.com/rishabhmehrotra/xapian/blob/master/xapian-letor/letor_inte...

...tags: (unofficial)`` on http://www.mpi-inf.mpg.de/departments/d5/software/inex/, right? Thank you! Jiarong Wei On Mar 9, 2014, at 0:52, Parth Gupta <pargup8 at gmail.com> wrote: > Hi Jiarong Wei, > > > 1. In https://github.com/rishabhmehrotra/xapian/blob/master/xapian-letor/letor_internal.cc#L299, there is a write_to_file method, which save RankList into ?train.txt?. But the format for ?train.txt? is different from the one mentioned in http://trac.xapian.org/wiki/GSoC2011/LTR/Notes#QueryLevelNorm. And in https://github.com/rishabhmehrotra/xapian/blob/master/xapian-letor/letor_inte...

...tests for it. Before adding tests, I think it would be better if xapian-letor could be made consistent with how xapian-core is written. For that, I'd first like to restructure some directories. Here are a few things that I intend to do: 1. Placing all api headers together (e.g. ranklist.h, letor_internal.h etc) in xapian-letor/include/letor 2. Rewriting letor.h and placing it in xapian-letor/include so that it does a job similar to xapian.h. The current letor.h contains some methods for which it is not the appropriate file. 3. Creating subdirectories like "ranker", "features&quo...

...so specified the ranker class, which should be implemented by a new LTR models, ListNet and ListMLE in your case. The evaluation file should be used for validating the performance of the algorithm in the training so which you plan to implement. You should take the corresponding definitions from the letor_internal.cc and create the corresponding .cc files. Feel free to do necessary changes and in case of any doubt, feel free to ask. Regards, Parth. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.xapian.org/pipermail/xapian-devel/attachments/20120424/dcc6787...

...ult set). At present, letor is mostly centred around RankList (for both training and ranking), whereas RankList is just a vector of FeatureVectors corresponding to a qid. Having RankList in ranking has no meaning since qid isn't required once the training part is over. (letor_rank(*) method in letor_internal.cc supplies a junk qid to the RankList while performing the ranking, which points out that the RankList approach isn't quite correct). Hence, RankList can be completely eliminated and instead we can have FeatureVector work on top of FeatureManager directly. Am I right? > > * letor it...