Hybrid Search: Combining Dense and Sparse Retrievers
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Reciprocal Rank Fusion Outperforms Condorcet and Individual Rankers, William R. Webber, Stephen E. Robertson, J. Shane Culpepper, Alistair Moffat, 2010Proceedings of the 2010 ACM SIGIR workshop on combining multiple evidence for information retrieval (ACM)DOI: 10.1145/1839886.1839893 - Introduces and evaluates Reciprocal Rank Fusion (RRF) as an effective method for combining results from multiple information retrieval systems, demonstrating its robustness.
Okapi at TREC-3, S. E. Robertson, S. Walker, S. Jones, M. M. Hancock-Beaulieu, M. Gatford, 1995Proceedings of the Third Text REtrieval Conference (TREC 3) (National Institute of Standards and Technology (NIST))DOI: 10.6028/NIST.SP.500-225 - Describes the Okapi BM25 ranking function, a widely used sparse retrieval algorithm based on a probabilistic model of information retrieval, and its performance in TREC-3.
Sentence-BERT: Sentence Embeddings using Siamese BERT-Networks, Nils Reimers, Iryna Gurevych, 2019Proceedings of the 2019 Conference on Empirical Methods in Natural Language Processing and the 9th International Joint Conference on Natural Language Processing (EMNLP-IJCNLP) (Association for Computational Linguistics)DOI: 10.18653/v1/D19-1410 - Introduces Sentence-BERT, a modification of pre-trained BERT networks that produces semantically meaningful sentence embeddings, significantly improving the efficiency and performance of dense retrieval for semantic similarity tasks.