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arXiv · 2603.05354

Exploring the potential and limitations of Model Merging for Multi-Domain Adaptation in ASR

Carlos Carvalho·Francisco Teixeira·Thomas Rolland·Alberto Abad
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Abstract

Model merging is a scalable alternative to multi-task training that combines the capabilities of multiple specialised models into a single model. This is particularly attractive for large speech foundation models, which are typically adapted through domain-specific fine-tuning, resulting in multiple customised checkpoints, for which repeating full fine-tuning when new data becomes available is computationally prohibitive. In this work, we study model merging for multi-domain ASR and benchmark 11 merging algorithms for 10 European Portuguese domains, evaluating in-domain accuracy, robustness under distribution shift, as well as English and multilingual performance. We further propose BoostedTSV-M, a new merging algorithm based on TSV-M that mitigates rank collapse via singular-value boosting and improves numerical stability. Overall, our approach outperforms full fine-tuning on European Portuguese while preserving out-of-distribution generalisation in a single model.

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Carlos Carvalho, Francisco Teixeira, Thomas Rolland, Alberto Abad. 2026-03-05. Exploring the potential and limitations of Model Merging for Multi-Domain Adaptation in ASR. https://arxiv.org/abs/2603.05354

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