Wei-Cheng Chao


2024

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An Effective Pronunciation Assessment Approach Leveraging Hierarchical Transformers and Pre-training Strategies
Bi-Cheng Yan | Jiun-Ting Li | Yi-Cheng Wang | Hsin Wei Wang | Tien-Hong Lo | Yung-Chang Hsu | Wei-Cheng Chao | Berlin Chen
Proceedings of the 62nd Annual Meeting of the Association for Computational Linguistics (Volume 1: Long Papers)

Automatic pronunciation assessment (APA) manages to quantify a second language (L2) learner’s pronunciation proficiency in a target language by providing fine-grained feedback with multiple pronunciation aspect scores at various linguistic levels. Most existing efforts on APA typically parallelize the modeling process, namely predicting multiple aspect scores across various linguistic levels simultaneously. This inevitably makes both the hierarchy of linguistic units and the relatedness among the pronunciation aspects sidelined. Recognizing such a limitation, we in this paper first introduce HierTFR, a hierarchal APA method that jointly models the intrinsic structures of an utterance while considering the relatedness among the pronunciation aspects. We also propose a correlation-aware regularizer to strengthen the connection between the estimated scores and the human annotations. Furthermore, novel pre-training strategies tailored for different linguistic levels are put forward so as to facilitate better model initialization. An extensive set of empirical experiments conducted on the speechocean762 benchmark dataset suggest the feasibility and effectiveness of our approach in relation to several competitive baselines.

2023

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Addressing the issue of Data Imbalance in Multi-granularity Pronunciation Assessment
Meng-Shin Lin | Hsin-Wei Wang | Tien-Hong Lo | Berlin Chen | Wei-Cheng Chao
Proceedings of the 35th Conference on Computational Linguistics and Speech Processing (ROCLING 2023)

2019

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探究端對端混合模型架構於華語語音辨識 (An Investigation of Hybrid CTC-Attention Modeling in Mandarin Speech Recognition)
Hsiu-Jui Chang | Wei-Cheng Chao | Tien-Hong Lo | Berlin Chen
International Journal of Computational Linguistics & Chinese Language Processing, Volume 24, Number 1, June 2019

2018

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結合鑑別式訓練聲學模型之類神經網路架構及優化方法的改進 (Leveraging Discriminative Training and Improved Neural Network Architecture and Optimization Method)
Wei-Cheng Chao | Hsiu-Jui Chang | Tien-Hong Lo | Belin Chen
International Journal of Computational Linguistics & Chinese Language Processing, Volume 23, Number 2, December 2018

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會議語音辨識使用語者資訊之語言模型調適技術 (On the Use of Speaker-Aware Language Model Adaptation Techniques for Meeting Speech Recognition ) [In Chinese]
Ying-wen Chen | Tien-hong Lo | Hsiu-jui Chang | Wei-Cheng Chao | Berlin Chen
Proceedings of the 30th Conference on Computational Linguistics and Speech Processing (ROCLING 2018)

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探討鑑別式訓練聲學模型之類神經網路架構及優化方法的改進 (Discriminative Training of Acoustic Models Leveraging Improved Neural Network Architecture and Optimization Method) [In Chinese]
Wei-Cheng Chao | Hsiu-Jui Chang | Tien-Hong Lo | Berlin Chen
Proceedings of the 30th Conference on Computational Linguistics and Speech Processing (ROCLING 2018)