Challenge: a recent study shows that late-interaction methods trade off retrieval accuracy and efficiency by exploiting cross-modal interactions only in the late stage.
Approach: They propose an inflating and shrinking approach to exploit cross-modal interactions . they inflate code inputs and shrink code outputs to exploit interactions progressively .
Outcome: The proposed method exploits cross-modal interactions in the late stage to achieve retrieval speed.

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Challenge: Current approaches to cross-modal retrieval process text and visual input jointly . current approaches are pretrained from scratch and suffer from huge retrieval latency and inefficiency issues .
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ColBERTv2: Effective and Efficient Retrieval via Lightweight Late Interaction (2022.naacl-main)

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Challenge: Neural information retrieval (IR) methods encode queries and documents into single vectors, but late interaction models produce multi-vector representations at the granularity of each token.
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MATCH: Modulating Attention via In-Context Retrieval for Long-Context Transformers (2026.acl-long)

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Challenge: Existing approaches to improve efficiency often enforce rigid structural constraints such as local attention windows.
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TRIAL: Token Relations and Importance Aware Late-interaction for Accurate Text Retrieval (2025.emnlp-main)

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Challenge: Late-interaction based multi-vector retrieval systems rely on a naive summation of token-level similarity scores . this leads to inaccurate relevance estimation due to tokenization of semantic units and the influence of low-content words.
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Challenge: Existing approaches to estimate semantic similarity of queries and documents rely on token-level information derived from query/document interactions.
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Leaner and Faster: Two-Stage Model Compression for Lightweight Text-Image Retrieval (2022.naacl-main)

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Challenge: Existing text-image approaches use pre-trained vision-language representations for text retrieval . however, these models pose non-trivial memory requirements and substantial indexing time .
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CELI: Simple yet Effective Approach to Enhance Out-of-Domain Generalization of Cross-Encoders. (2024.naacl-short)

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Challenge: Existing cross-encoders do not capture all information into the [CLS] token . Xiong et al., 2021) find that the out-of-domain approach is less robust.
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Typo-Robust Representation Learning for Dense Retrieval (2023.acl-short)

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Challenge: Dense retrieval is a fundamental building block of information retrieval applications.
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QuadrupletBERT: An Efficient Model For Embedding-Based Large-Scale Retrieval (2021.naacl-main)

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Challenge: Existing methods for large-scale query-document retrieval are expensive and require sparse handcrafted features.
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Collapse of Dense Retrievers: Short, Early, and Literal Biases Outranking Factual Evidence (2025.acl-long)

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Challenge: Notably, when multiple biases combine, models exhibit catastrophic performance degradation, selecting the answer-containing document in less than 10% of cases over a synthetic biased document without the answer.
Approach: They repurpose a relation extraction dataset to quantify the impact of heuristic biases on retrievers like Dragon+ and Contriever.
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