search for: svmranker

...dataset and leverage it to predict the rankings of other dataset) or is it for supervised learning? For instance - Xapian currently powers the Gmane search which is by default based on BM25 weighting scheme and now suppose we want to use LETOR to rank the top k retrieved search results, lets take SVMRanker for an example, will it rank the Gmane's search results based on the weights learned from INEX dataset because the client won't be providing any training file. And also I don't think it'll perform good for two datasets of different distributions. So how are we going to use it? PROP...

...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 training part basically uses the libsvm library and training data to train a model, then save the model file. The ranking part will calculate score for each document in searching results (MSet) by using the trained model file. My question is for each of our three rank...

...n.h. The current letor.h contains some methods for which it is not the appropriate file. 3. Creating subdirectories like "ranker", "features" etc. and placing appropriate files in them. 4. Fixing minor bugs that I encounter in completing this process. (For instance, including svmranker in Makefile.am, since it does not do so at present). 5. Ask for a review and merge changes to master. Is this the right way to go about it? Regards, Ayush -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.xapian.org/pipermail/xapian-devel/attachmen...

...ass 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 have several questions regarding the letor module,I looked at the framework of learning to rank in xapian http://rishabhmehrotra.com/gsoc/17.png, I am a little confused. Why using deep learning to find unsupervised features in test data? Since in my understanding, learning to rank model usually learn features from the training data then apply the model to the test data? Why test set and

Hi Parth, I?ve implemented SVMRanker class and also sorted out most of current Letor APIs. Now I?m trying to use INEX dataset to verify my implement. But I stuck in the indexing part. You said in the documentation that we have to add prefix when indexing. Also I notice that you set some metadata in omindex.cc of your version. But the...

Hi everyone, My name is Shreedhar Pawar. I have already introduced myself on Xapian-discuss... I feel that the Xapian Search/Letor Algorithm, can speed up using Parallel computing. Techniques like Map-reduce, 'compact n split', radix sort, scan, parallel hashing n much more can be used to speed up the learning algorithms as well as the search... support vector machines in the Letor