Cheongjae Lee


2021

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Self-Training using Rules of Grammar for Few-Shot NLU
Joonghyuk Hahn | Hyunjoon Cheon | Kyuyeol Han | Cheongjae Lee | Junseok Kim | Yo-Sub Han
Findings of the Association for Computational Linguistics: EMNLP 2021

We tackle the problem of self-training networks for NLU in low-resource environment—few labeled data and lots of unlabeled data. The effectiveness of self-training is a result of increasing the amount of training data while training. Yet it becomes less effective in low-resource settings due to unreliable labels predicted by the teacher model on unlabeled data. Rules of grammar, which describe the grammatical structure of data, have been used in NLU for better explainability. We propose to use rules of grammar in self-training as a more reliable pseudo-labeling mechanism, especially when there are few labeled data. We design an effective algorithm that constructs and expands rules of grammar without human involvement. Then we integrate the constructed rules as a pseudo-labeling mechanism into self-training. There are two possible scenarios regarding data distribution: it is unknown or known in prior to training. We empirically demonstrate that our approach substantially outperforms the state-of-the-art methods in three benchmark datasets for both scenarios.

2009

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Automatic Agenda Graph Construction from Human-Human Dialogs using Clustering Method
Cheongjae Lee | Sangkeun Jung | Kyungduk Kim | Gary Geunbae Lee
Proceedings of Human Language Technologies: The 2009 Annual Conference of the North American Chapter of the Association for Computational Linguistics, Companion Volume: Short Papers

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Hybrid Approach to User Intention Modeling for Dialog Simulation
Sangkeun Jung | Cheongjae Lee | Kyungduk Kim | Gary Geunbae Lee
Proceedings of the ACL-IJCNLP 2009 Conference Short Papers

2008

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A Frame-Based Probabilistic Framework for Spoken Dialog Management Using Dialog Examples
Kyungduk Kim | Cheongjae Lee | Sangkeun Jung | Gary Geunbae Lee
Proceedings of the 9th SIGdial Workshop on Discourse and Dialogue

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An Integrated Dialog Simulation Technique for Evaluating Spoken Dialog Systems
Sangkeun Jung | Cheongjae Lee | Kyungduk Kim | Gary Geunbae Lee
Coling 2008: Proceedings of the workshop on Speech Processing for Safety Critical Translation and Pervasive Applications

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Robust Dialog Management with N-Best Hypotheses Using Dialog Examples and Agenda
Cheongjae Lee | Sangkeun Jung | Gary Geunbae Lee
Proceedings of ACL-08: HLT