Unifying Conformal Language Tasks with In-Context Ensembles

Xiao Shi Huang, Chen-Yuan Lin, Bruce Kuwahara, Kin Kwan Leung, Jesse C. Cresswell


Abstract
Many NLP tasks, such as summarization and extractive question answering, reduce to retrieving relevant content from documents under two constraints: coverage, retaining enough pertinent information to achieve some goal, and conciseness, removing as much irrelevant information as possible. Conformal prediction methods have been used to guarantee coverage, and must be optimized for conciseness through design of a score function. State-of-the-art scoring functions use hand-engineered LLM prompts asking the model to rate the importance of content, but manual prompt engineering is labor-intensive and task-specific. We introduce the Conformal Relevance framework which uses in-context learning example curation and ensembling to create a score function which maintains coverage while improving conciseness with minimal manual input. We demonstrate this framework’s application on seven NLP tasks, and also theoretically study the impact of diversity for ensembled conformal scores, giving a complementarity condition that characterizes when ensembling improves worst-case sentence scores, and a saturation bound on ensemble improvement.
Anthology ID:
2026.findings-emnlp.453
Volume:
Findings of the Association for Computational Linguistics: EMNLP 2026
Month:
October
Year:
2026
Address:
Budapest, Hungary
Editors:
Hung-Yi Lee, Sunipa Dev, Jessy Li, Desmond Elliott
Venue:
Findings
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SIGDAT
Publisher:
Association for Computational Linguistics
Note:
Pages:
9500–9532
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URL:
https://aclanthology.org/2026.findings-emnlp.453/
DOI:
Bibkey:
Cite (ACL):
Xiao Shi Huang, Chen-Yuan Lin, Bruce Kuwahara, Kin Kwan Leung, and Jesse C. Cresswell. 2026. Unifying Conformal Language Tasks with In-Context Ensembles. In Findings of the Association for Computational Linguistics: EMNLP 2026, pages 9500–9532, Budapest, Hungary. Association for Computational Linguistics.
Cite (Informal):
Unifying Conformal Language Tasks with In-Context Ensembles (Huang et al., Findings 2026)
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PDF:
https://aclanthology.org/2026.findings-emnlp.453.pdf