| Challenge: | Dual encoders perform retrieval by encoding documents and queries into dense low-dimensional vectors, scoring each document by its inner product with the query. |
| Approach: | They propose a dual-encoder-based neural model that combines the efficiency of dual encoders with expressiveness of more costly attentional architectures. |
| Outcome: | The proposed model outperforms strong alternatives in large-scale retrieval. |
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Investigating Multi-layer Representations for Dense Passage Retrieval (2025.findings-emnlp)
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| Challenge: | Dense retrieval models adopt vectors from the last hidden layer of the document encoder to represent a document, which is in contrast to the fact that representations in different layers of a pre-trained language model contain different kinds of linguistic knowledge and behave differently during fine-tuning. |
| Approach: | They propose to utilize representations from multiple encoder layers to make up the representation of a document, which they denote Multi-layer Representations (MLR). |
| Outcome: | The proposed model outperforms dual encoder, ME-BERT and ColBERT in the single-vector retrieval setting and with other advanced training techniques. |
Pseudo-Relevance for Enhancing Document Representation (2022.emnlp-main)
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| Challenge: | a novel approach to document retrieval can be used to encode documents as vectors . a few query-relevant terms can be pruned out to reduce index overhead . |
| Approach: | They propose to enhance the document representation for the bi-encoder approach in dense document retrieval. |
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Multi-Vector Attention Models for Deep Re-ranking (2021.emnlp-main)
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| Challenge: | Document retrieval systems often use two styles of neural network models . dual encoder models are used for retrieval and deep re-ranking, while cross-attention models are typically used for shallow reranking. |
| Approach: | They propose a dual encoder and cross-attention neural network architectures that combine query and document representations to optimize retrieval accuracy. |
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GNN-encoder: Learning a Dual-encoder Architecture via Graph Neural Networks for Dense Passage Retrieval (2022.findings-emnlp)
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| Challenge: | Existing approaches to perform large-scale query-passage retrieval are term-based, but they lose interaction between query-pastage pairs. |
| Approach: | They propose to fuse query (passage) information into query representations via graph neural networks that are constructed by queries and their top retrieved passages. |
| Outcome: | The proposed model outperforms existing models on MSMARCO, Natural Questions and TriviaQA datasets and achieves the new state-of-the-art on these datasets. |
What Are You Token About? Dense Retrieval as Distributions Over the Vocabulary (2023.acl-long)
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| Challenge: | Dense retrieval models based on text representations have proven very effective, but when applied off-the-shelf they often experience a severe drop in performance. |
| Approach: | They propose to interpret the vector representations produced by dual encoders by projecting them into the model’s vocabulary space. |
| Outcome: | The proposed model significantly improves on the BEIR benchmark and in zero-shot settings. |
Ultra-High Dimensional Sparse Representations with Binarization for Efficient Text Retrieval (2021.emnlp-main)
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| Challenge: | Recent approaches to information retrieval (IR) and natural language processing (NLP) use contextual language models, which can improve both synonymy and polysemy problems associated with words. |
| Approach: | They propose an ultra-high dimensional representation scheme equipped with directly controllable sparsity and a bucketing method where embeddings from multiple layers of BERT are selected/merged to represent diverse linguistic aspects. |
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Extremely efficient online query encoding for dense retrieval (2024.findings-naacl)
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| Challenge: | Existing dense retrieval systems use the same model architecture for encoding both passages and queries, even though queries are much shorter and simpler than passages. |
| Approach: | They propose a small efficient RNN query encoder that can reduce latency by 12 with only a minor decrease in quality. |
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Decoding Dense Embeddings: Sparse Autoencoders for Interpreting and Discretizing Dense Retrieval (2025.emnlp-main)
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| Challenge: | Existing sparse retrieval methods suffer from a lack of interpretability . we propose a new interpretability framework that decomposes dense embeddings into distinct, interpretable latent concepts. |
| Approach: | They propose a new interpretability framework that leveragesSparse Autoencoders to decompose uninterpretable dense embeddings fromDPR models into distinct, interpretable latent concepts. |
| Outcome: | The proposed interpretability framework achieves high index-space and computational efficiency while maintaining robust performance across vocabulary and semantic mismatches. |
The Curse of Dense Low-Dimensional Information Retrieval for Large Index Sizes (2021.acl-short)
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| Challenge: | Existing studies have shown that dense representations outperform sparse representations with large index sizes. |
| Approach: | They propose to use dense low-dimensional representations to retrieve relevant documents . they show performance decreases quicker for increasing index sizes than for sparse representations . |
| Outcome: | The proposed representations outperform sparse representations with large index sizes. |
Augmenting Document Representations for Dense Retrieval with Interpolation and Perturbation (2022.acl-short)
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| Challenge: | Existing sparse retrieval models rely on term-based matching to retrieve relevant documents. |
| Approach: | They propose a framework which augments the representations of documents with interpolation and perturbation. |
| Outcome: | The proposed framework significantly outperforms baselines on the dense retrieval of both the labeled and unlabeled documents. |