uDistil-Whisper: Label-Free Data Filtering for Knowledge Distillation in Low-Data Regimes

Abdul Waheed, Karima Kadaoui, Bhiksha Raj, Muhammad Abdul-Mageed


Abstract
Recent work on distilling Whisper’s knowledge into small models using pseudo-labels shows promising performance while reducing the size by up to 50%. This results in small, efficient, and dedicated models. However, a critical step of distillation using pseudo-labels involves filtering high-quality predictions and using only those during training. This step requires ground truth labels to compare with and filter low-quality examples, making the process dependent on human labels. Additionally, the distillation process requires a large amount of data thereby limiting its applicability in low-resource settings. To address this, we propose a distillation framework that does not require any labeled data. Through experimentation, we show that our best-distilled models outperform the teacher model by 5-7 WER points and are on par with or outperform similar supervised data filtering setups. When scaling the data, our models significantly outperform all zero-shot and supervised models. Our models are also 25-50% more compute- and memory-efficient while maintaining performance equal to or better than that of the teacher model. For more details about our models, dataset, and other resources, please visit our GitHub page: https://github.com/UBC-NLP/uDistilWhisper.
Anthology ID:
2025.naacl-long.296
Volume:
Proceedings of the 2025 Conference of the Nations of the Americas Chapter of the Association for Computational Linguistics: Human Language Technologies (Volume 1: Long Papers)
Month:
April
Year:
2025
Address:
Albuquerque, New Mexico
Editors:
Luis Chiruzzo, Alan Ritter, Lu Wang
Venue:
NAACL
SIG:
Publisher:
Association for Computational Linguistics
Note:
Pages:
5750–5767
Language:
URL:
https://preview.aclanthology.org/fix-sig-urls/2025.naacl-long.296/
DOI:
Bibkey:
Cite (ACL):
Abdul Waheed, Karima Kadaoui, Bhiksha Raj, and Muhammad Abdul-Mageed. 2025. uDistil-Whisper: Label-Free Data Filtering for Knowledge Distillation in Low-Data Regimes. In Proceedings of the 2025 Conference of the Nations of the Americas Chapter of the Association for Computational Linguistics: Human Language Technologies (Volume 1: Long Papers), pages 5750–5767, Albuquerque, New Mexico. Association for Computational Linguistics.
Cite (Informal):
uDistil-Whisper: Label-Free Data Filtering for Knowledge Distillation in Low-Data Regimes (Waheed et al., NAACL 2025)
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PDF:
https://preview.aclanthology.org/fix-sig-urls/2025.naacl-long.296.pdf