Zhang, Peng; Hou, Yuexian and Song, Dawei
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|DOI (Digital Object Identifier) Link:||http://dx.doi.org/10.1145/1571941.1571962|
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Pseudo relevance feedback (PRF), which has been widely applied in IR, aims to derive a distribution from the top n pseudo relevant documents D. However, these documents are often a mixture of relevant and irrelevant documents. As a result, the derived distribution is actually a mixture model, which has long been limiting the performance of PRF. This is particularly the case when we deal with difficult queries where the truly relevant documents in D are very sparse. In this situation, it is often easier to identify a small number of seed irrelevant documents, which can form a seed irrelevant distribution. Then, a fundamental and challenging problem arises: solely based on the mixed distribution and a seed irrelevance distribution, how to automatically generate an optimal approximation of the true relevance distribution? In this paper, we propose a novel distribution separation model (DSM) to tackle this problem. Theoretical justifications of the proposed algorithm are given. Evaluation results from our extensive simulated experiments on several large scale TREC data sets demonstrate the effectiveness of our method, which outperforms a well respected PRF Model, the Relevance Model (RM), as well as the use of RM on D with the seed negative documents directly removed.
|Item Type:||Conference Item|
|Copyright Holders:||2009 ACM|
|Extra Information:||SIGIR '09
Proceedings of the 32nd International ACM SIGIR Conference on Research and Development in Information Retrieval
ACM New York, NY, USA ©2009
|Academic Unit/Department:||Mathematics, Computing and Technology > Computing & Communications|
|Depositing User:||Dawei Song|
|Date Deposited:||21 Jun 2012 09:53|
|Last Modified:||26 Oct 2012 22:07|
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