Seoho Song
2022
Pseudo-Relevance for Enhancing Document Representation
Jihyuk Kim
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Seung-won Hwang
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Seoho Song
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Hyeseon Ko
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Young-In Song
Proceedings of the 2022 Conference on Empirical Methods in Natural Language Processing
This paper studies how to enhance the document representation for the bi-encoder approach in dense document retrieval. The bi-encoder, separately encoding a query and a document as a single vector, is favored for high efficiency in large-scale information retrieval, compared to more effective but complex architectures. To combine the strength of the two, the multi-vector representation of documents for bi-encoder, such as ColBERT preserving all token embeddings, has been widely adopted. Our contribution is to reduce the size of the multi-vector representation, without compromising the effectiveness, supervised by query logs. Our proposed solution decreases the latency and the memory footprint, up to 8- and 3-fold, validated on MSMARCO and real-world search query logs.
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