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• W4220798854 abstract "In this work, we study recent advances in context-sensitive language models for the task of query expansion. We study the behavior of existing and new approaches for lexical word-based expansion in both unsupervised and supervised contexts. For unsupervised models, we study the behavior of the Contextualized Embeddings for Query Expansion (CEQE) model. We introduce a new model, Supervised Contextualized Query Expansion with Transformers (SQET) that performs expansion as a supervised classification task and leverages context in pseudo-relevant results. We study the behavior of these expansion approaches for the tasks of ad-hoc document and passage retrieval. We conduct experiments combining expansion with probabilistic retrieval models as well as neural document ranking models. We evaluate expansion effectiveness on three standard TREC collections: Robust, Complex Answer Retrieval, and Deep Learning. We analyze the results of extrinsic retrieval effectiveness, intrinsic ability to rank expansion terms, and perform a qualitative analysis of the differences between the methods. We find out CEQE statically significantly outperforms static embeddings across all three datasets for Recall@1000. Moreover, CEQE outperforms static embedding-based expansion methods on multiple collections (by up to 18% on Robust and 31% on Deep Learning on average precision) and also improves over proven probabilistic pseudo-relevance feedback (PRF) models. SQET outperforms CEQE by 6% in P@20 on the intrinsic term ranking evaluation and is approximately as effective in retrieval performance. Models incorporating neural and CEQE-based expansion score achieves gains of up to 5% in P@20 and 2% in AP on Robust over the state-of-the-art transformer-based re-ranking model, Birch." @default.
• W4220798854 created "2022-04-03" @default.
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• W4220798854 date "2022-03-22" @default.
• W4220798854 modified "2023-10-11" @default.
• W4220798854 title "CEQE to SQET: A study of contextualized embeddings for query expansion" @default.
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• W4220798854 doi "https://doi.org/10.1007/s10791-022-09405-y" @default.
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