Challenge: Automatic Speech Recognition systems perform poorly on atypical speech and heavily accented speech.
Approach: They add a residual adapter to the encoder layer to improve model adaptation . they show that the residual adapters update only a tiny fraction of the model parameters .
Outcome: The proposed model fine-tuning improves performance on atypical and accented speech . the system can update only a tiny fraction of the model parameters .

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Advancing African-Accented English Speech Recognition: Epistemic Uncertainty-Driven Data Selection for Generalizable ASR Models (2025.acl-srw)

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Challenge: Accents play a pivotal role in shaping human communication, a new study finds . existing ASR systems often perform inadequately, even mispronouncing African names .
Approach: They propose a method that uses epistemic uncertainty to automate annotation to reduce costs and human labor.
Outcome: The proposed method reduces costs and human labor by reducing data annotation and epistemic uncertainty.
A Unified Speaker Adaptation Approach for ASR (2021.emnlp-main)

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Challenge: Adapting a model to target speakers requires a lot of compute and may cause catastrophic forgetting to the existing speakers.
Approach: They propose a unified speaker adaptation approach consisting of feature adaptation and model adaptation.
Outcome: The proposed model outperforms baseline models with 20.58% relative WER reduction and surpasses finetuning method by 2.54% on target speaker adaptation.
On the Effectiveness of Adapter-based Tuning for Pretrained Language Model Adaptation (2021.acl-long)

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Challenge: Existing studies have shown that adapter-based tuning is more parameter-efficient than fine-tuning.
Approach: They propose to add adapter modules to a pretrained language model and update the parameters of adapter module when learning on a downstream task.
Outcome: The proposed method outperforms fine-tuning on low-resource and cross-lingual tasks and settings.
Adapting Where It Matters: Depth-Aware Adaptation for Efficient Multilingual Speech Recognition in Low-Resource Languages (2026.findings-acl)

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Challenge: Recent speech foundation models excel at multilingual automatic speech recognition (ASR) for high-resource languages, but their performance drops substantially on low-resourced languages due to the limited data availability.
Approach: They propose a Depth-Aware Model Adaptation framework that allocates adaptation capacity according to each layer’s role.
Outcome: The proposed framework matches or surpasses state-of-the-art accuracy with 80% fewer trainable parameters and achieves 29% error reduction under extreme data scarcity.
Fine-Tuning ASR models for Very Low-Resource Languages: A Study on Mvskoke (2024.acl-srw)

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Challenge: Recent advances in multilingual models for automatic speech recognition (ASR) have been able to achieve a high accuracy for languages with extremely limited resources.
Approach: They examine the parameter efficiency of training an adapter for the Mvskoke language, an indigenous language of America.
Outcome: The proposed model is parameter efficient and gives higher accuracy for a relatively small amount of data.
Retrieve and Copy: Scaling ASR Personalization to Large Catalogs (2023.emnlp-industry)

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Challenge: End-to-end ASR models struggle to recognize uncommon domain-specific words due to limited audio context.
Approach: They propose a "Retrieve and Copy" mechanism to improve latency while retaining the accuracy even when scaled to a large catalog.
Outcome: The proposed method achieves 6% more word error rate reduction and 3.6% improvement in F1 when scaled to a large catalog size while retaining the accuracy.
An (unhelpful) guide to selecting the best ASR architecture for your under-resourced language (2023.acl-short)

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Challenge: English ASR now has word error rates comparable to that of human transcriptionists, but only for the handful of the world's 7000 languages with abundant training resources.
Approach: They propose to use four of the most popular ASR toolkits to train ASR models for eleven languages with limited ASR training resources: eleven widely spoken languages of Africa, Asia, and South America, one endangered language of Central America, and three critically endangered languages of North America.
Outcome: The proposed architecture outperforms four of the most popular ASR toolkits for eleven languages with limited training resources.
SparseAdapter: An Easy Approach for Improving the Parameter-Efficiency of Adapters (2022.findings-emnlp)

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Challenge: Pretrain-finetuned models are increasingly complex and require more parameters to match the performance of full fine-tuning.
Approach: They propose an efficient Adapter Tuning technique that freezes pretrained language models and fine-tunes a few extra modules.
Outcome: The proposed setting outperforms the standard Adapter Tuning by 80% . the proposed setting is easy to use and has a high sparse ratio .
Lightweight Adapter Tuning for Multilingual Speech Translation (2021.acl-short)

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Challenge: Adapter tuning is an efficient alternative to fine-tuning in NLP . a multilingual model could be outperformed by its bilingual counterparts .
Approach: They propose to use adapter tuning to optimize for multilingual speech translation . they use pre-trained models to freeze pre-train parameters and inject lightweight modules .
Outcome: The proposed adapters can specialize to specific language pairs with low extra cost . the proposed models outperform bilingual models on high-resource language pairs .
Towards Adaptive Prefix Tuning for Parameter-Efficient Language Model Fine-tuning (2023.acl-short)

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Challenge: Parameter-efficient fine-tuning only optimizes a few task-specific parameters with frozen pre-trained model.
Approach: They propose to optimize a prefix vector inserted into Transformer layers to optimize the prefix . they propose to use a gate mechanism to adjust the prefixed to each layer .
Outcome: The proposed approach improves on the SuperGLUE and NER datasets.

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