Efficient coordinate descent for ranking with domination loss

We define a new batch coordinate-descent ranking algorithm based on a domination loss, which is designed to rank a small number of positive examples above all negatives, with a large penalty on false positives. Its objective is to learn a linear ranking function for a query with labeled training examples in order to rank documents. The derived single-coordinate updates scale linearly with respect to the number of examples. We investigate a number of modifications to the basic algorithm, including regularization, layers of examples, and feature induction. The algorithm is tested on multiple datasets and problem settings, including Microsoft's LETOR dataset, the Corel image dataset, a Google image dataset, and Reuters RCV1. Specific results vary by problem and dataset, but the algorithm generally performed similarly to existing algorithms when rated by average precision and precision at top k. It does not train as quickly as online algorithms, but offers extensions to multiple layers, and perhaps most importantly, can be used to produce extremely sparse weight vectors. When trained with feature induction, it achieves similarly competitive performance but with much more compact models.

Department dc:contributor.department

Massachusetts Institute of Technology. Dept. of Electrical Engineering and Computer Science.

Grantor dc:publisher

Massachusetts Institute of Technology

Year dc:date.issued

2010

Author dc:creator

• Stevens, Mark A., M. Eng. Massachusetts Institute of Technology

Advisor dc:contributor.advisor

• Yoram Singer and Michael Collins.

• Electrical Engineering and Computer Science.

Statement dc:rights

• M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission.

Licence dc:rights.uri

• http://dspace.mit.edu/handle/1721.1/7582

Language dc:language.iso

eng

Handle dc:identifier.uri

http://hdl.handle.net/1721.1/61592

OAI identifier oai:identifier

oai:dspace.mit.edu:1721.1/61592