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Dehghani, M. and Azarbonyad, H. and Kamps, J. and Hiemstra, D. and Marx, M. (2016) Luhn Revisited: Significant Words Language Models. In: Proceedings of the 25th ACM International on Conference on Information and Knowledge Management (CIKM 2016), October 24 - 28, 2016, Indianapolis, Indiana, USA. pp. 1301-1310. ACM. ISBN 978-1-4503-4073-1
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Official URL: http://dx.doi.org/10.1145/2983323.2983814
Users tend to articulate their complex information needs in only a few keywords, making underspecified statements of request the main bottleneck for retrieval effectiveness. Taking advantage of feedback information is one of the best ways to enrich the query representation, but can also lead to loss of query focus and harm performance - in particular when the initial query retrieves only little relevant information - when overfitting to accidental features of the particular observed feedback documents. Inspired by the early work of Hans Peter Luhn, we propose significant words language models of feedback documents that capture all, and only, the significant shared terms from feedback documents. We adjust the weights of common terms that are already well explained by the document collection as well as the weight of rare terms that are only explained by specific feedback documents, which eventually results in having only the significant terms left in the feedback model.
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