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• W3157758108 abstract "Abstract Dual encoders perform retrieval by encoding documents and queries into dense low-dimensional vectors, scoring each document by its inner product with the query. We investigate the capacity of this architecture relative to sparse bag-of-words models and attentional neural networks. Using both theoretical and empirical analysis, we establish connections between the encoding dimension, the margin between gold and lower-ranked documents, and the document length, suggesting limitations in the capacity of fixed-length encodings to support precise retrieval of long documents. Building on these insights, we propose a simple neural model that combines the efficiency of dual encoders with some of the expressiveness of more costly attentional architectures, and explore sparse-dense hybrids to capitalize on the precision of sparse retrieval. These models outperform strong alternatives in large-scale retrieval." @default.
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• W3157758108 date "2021-01-01" @default.
• W3157758108 modified "2023-10-13" @default.
• W3157758108 title "Sparse, Dense, and Attentional Representations for Text Retrieval" @default.
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• W3157758108 doi "https://doi.org/10.1162/tacl_a_00369" @default.
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