Search Results for author: Ahmed Mourad

Found 8 papers, 4 papers with code

TPRF: A Transformer-based Pseudo-Relevance Feedback Model for Efficient and Effective Retrieval

no code implementations24 Jan 2024 Chuting Yu, Hang Li, Ahmed Mourad, Bevan Koopman, Guido Zuccon

This paper considers Pseudo-Relevance Feedback (PRF) methods for dense retrievers in a resource constrained environment such as that of cheap cloud instances or embedded systems (e. g., smartphones and smartwatches), where memory and CPU are limited and GPUs are not present.

Retrieval

AgAsk: An Agent to Help Answer Farmer's Questions From Scientific Documents

1 code implementation21 Dec 2022 Bevan Koopman, Ahmed Mourad, Hang Li, Anton van der Vegt, Shengyao Zhuang, Simon Gibson, Yash Dang, David Lawrence, Guido Zuccon

On the basis of these needs we release an information retrieval test collection comprising real questions, a large collection of scientific documents split in passages, and ground truth relevance assessments indicating which passages are relevant to each question.

Information Retrieval Retrieval

How does Feedback Signal Quality Impact Effectiveness of Pseudo Relevance Feedback for Passage Retrieval?

no code implementations12 May 2022 Hang Li, Ahmed Mourad, Bevan Koopman, Guido Zuccon

Pseudo-Relevance Feedback (PRF) assumes that the top results retrieved by a first-stage ranker are relevant to the original query and uses them to improve the query representation for a second round of retrieval.

Passage Retrieval Retrieval

To Interpolate or not to Interpolate: PRF, Dense and Sparse Retrievers

no code implementations30 Apr 2022 Hang Li, Shuai Wang, Shengyao Zhuang, Ahmed Mourad, Xueguang Ma, Jimmy Lin, Guido Zuccon

In this paper we consider the problem of combining the relevance signals from sparse and dense retrievers in the context of Pseudo Relevance Feedback (PRF).

Information Retrieval Language Modelling +1

Improving Query Representations for Dense Retrieval with Pseudo Relevance Feedback: A Reproducibility Study

1 code implementation13 Dec 2021 Hang Li, Shengyao Zhuang, Ahmed Mourad, Xueguang Ma, Jimmy Lin, Guido Zuccon

Finally, we contribute a study of the generalisability of the ANCE-PRF method when dense retrievers other than ANCE are used for the first round of retrieval and for encoding the PRF signal.

Retrieval

Seed-driven Document Ranking for Systematic Reviews: A Reproducibility Study

1 code implementation8 Dec 2021 Shuai Wang, Harrisen Scells, Ahmed Mourad, Guido Zuccon

Our results also indicate that our reproduced screening prioritisation method, (1) is generalisable across datasets of similar and different topicality compared to the original implementation, (2) that when using multiple seed studies, the effectiveness of the method increases using our techniques to enable this, (3) and that the use of multiple seed studies produces more stable rankings compared to single seed studies.

Document Ranking

Pseudo Relevance Feedback with Deep Language Models and Dense Retrievers: Successes and Pitfalls

1 code implementation25 Aug 2021 Hang Li, Ahmed Mourad, Shengyao Zhuang, Bevan Koopman, Guido Zuccon

Text-based PRF results show that the use of PRF had a mixed effect on deep rerankers across different datasets.

Retrieval

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