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            <title>Proceedings of the BioNLP 2026 (Shared Tasks)</title>
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    <abstract>We build an ensemble of 10 transformer encoders for the MedExACT 2026 shared task on medical decision span detection. The ensemble is diversified along three training directions: encoder initialization (including domain-adaptive pre-training on clinical text), loss function, and data augmentation with LLM-generated synthetic notes and silver-labeled clinical documents. Greedy forward search selects the combination with the highest validation final score. A BERT-based boundary refiner is applied to the ensemble’s predicted spans to correct offset errors before submission.</abstract>
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%0 Conference Proceedings
%T Otter at MedExAct2026: Diverse Encoder Ensemble for Medical Decision Span Detection
%A Lowphansirikul, Lalita
%A Ittichaiwong, Piyalitt
%Y Gupta, Deepak
%Y Demner-Fushman, Dina
%S Proceedings of the BioNLP 2026 (Shared Tasks)
%D 2026
%8 July
%I Association for Computational Linguistics
%C San Diego, California, USA
%@ 979-8-89176-435-4
%F lowphansirikul-ittichaiwong-2026-otter
%X We build an ensemble of 10 transformer encoders for the MedExACT 2026 shared task on medical decision span detection. The ensemble is diversified along three training directions: encoder initialization (including domain-adaptive pre-training on clinical text), loss function, and data augmentation with LLM-generated synthetic notes and silver-labeled clinical documents. Greedy forward search selects the combination with the highest validation final score. A BERT-based boundary refiner is applied to the ensemble’s predicted spans to correct offset errors before submission.
%U https://aclanthology.org/2026.bionlp-2.7/
%P 47-53

Markdown (Informal)

[Otter at MedExAct2026: Diverse Encoder Ensemble for Medical Decision Span Detection](https://aclanthology.org/2026.bionlp-2.7/) (Lowphansirikul & Ittichaiwong, BioNLP 2026)

• Otter at MedExAct2026: Diverse Encoder Ensemble for Medical Decision Span Detection (Lowphansirikul & Ittichaiwong, BioNLP 2026)

ACL

• Lalita Lowphansirikul and Piyalitt Ittichaiwong. 2026. Otter at MedExAct2026: Diverse Encoder Ensemble for Medical Decision Span Detection. In Proceedings of the BioNLP 2026 (Shared Tasks), pages 47–53, San Diego, California, USA. Association for Computational Linguistics.