CONF Fehr_ACL_2025/IDIAP CoRet: Improved Retriever for Code Editing Fehr, Fabio Proceedings of the 63rd Annual Meeting of the Association for Computational Linguistics (Volume 2: Short Papers) 2025 https://aclanthology.org/2025.acl-short.62/ URL 10.18653/v1/2025.acl-short.62 doi In this paper, we introduce CoRet, a dense retrieval model designed for code-editing tasks that integrates code semantics, repository structure, and call-graph dependencies. The model focuses on retrieving relevant portions of a code repository based on natural language queries such as requests to implement new features or fix bugs. These retrieved code chunks can then be presented to an user or to a second code-editing model or agent. To train CoRet, we propose a loss function explicitly designed for repository-level retrieval. On SWE-bench and Long Code Arena’s bug localisation datasets, we show that our model substantially improves retrieval recall by at least 15 percentage points over existing models, and ablate the design choices to show their importance in achieving these results.