ViMedCSS: A Vietnamese Medical Code-Switching Speech Dataset & Benchmark

• URL: http://arxiv.org/abs/2602.12911v1
• Date: Fri, 13 Feb 2026 13:17:16 GMT
• Title: ViMedCSS: A Vietnamese Medical Code-Switching Speech Dataset & Benchmark
• Authors: Tung X. Nguyen, Nhu Vo, Giang-Son Nguyen, Duy Mai Hoang, Chien Dinh Huynh, Inigo Jauregi Unanue, Massimo Piccardi, Wray Buntine, Dung D. Le,
• Abstract summary: Code-switching (CS) is when Vietnamese speech uses English words like drug names or procedures.<n>Current Automatic Speech Recognition systems struggle to recognize correctly English medical terms within Vietnamese sentences.<n>This work provides the first benchmark for Vietnamese medical code-switching.
• Score: 7.798521826811972
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Code-switching (CS), which is when Vietnamese speech uses English words like drug names or procedures, is a common phenomenon in Vietnamese medical communication. This creates challenges for Automatic Speech Recognition (ASR) systems, especially in low-resource languages like Vietnamese. Current most ASR systems struggle to recognize correctly English medical terms within Vietnamese sentences, and no benchmark addresses this challenge. In this paper, we construct a 34-hour \textbf{Vi}etnamese \textbf{Med}ical \textbf{C}ode-\textbf{S}witching \textbf{S}peech dataset (ViMedCSS) containing 16,576 utterances. Each utterance includes at least one English medical term drawn from a curated bilingual lexicon covering five medical topics. Using this dataset, we evaluate several state-of-the-art ASR models and examine different specific fine-tuning strategies for improving medical term recognition to investigate the best approach to solve in the dataset. Experimental results show that Vietnamese-optimized models perform better on general segments, while multilingual pretraining helps capture English insertions. The combination of both approaches yields the best balance between overall and code-switched accuracy. This work provides the first benchmark for Vietnamese medical code-switching and offers insights into effective domain adaptation for low-resource, multilingual ASR systems.

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