Yi-Chen Chang


2023

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XFEVER: Exploring Fact Verification across Languages
Yi-Chen Chang | Canasai Kruengkrai | Junichi Yamagishi
Proceedings of the 35th Conference on Computational Linguistics and Speech Processing (ROCLING 2023)

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Learning to Paraphrase Sentences to Different Complexity Levels
Alison Chi | Li-Kuang Chen | Yi-Chen Chang | Shu-Hui Lee | Jason S. Chang
Transactions of the Association for Computational Linguistics, Volume 11

While sentence simplification is an active research topic in NLP, its adjacent tasks of sentence complexification and same-level paraphrasing are not. To train models on all three tasks, we present two new unsupervised datasets. We compare these datasets, one labeled by a weak classifier and the other by a rule-based approach, with a single supervised dataset. Using these three datasets for training, we perform extensive experiments on both multitasking and prompting strategies. Compared to other systems trained on unsupervised parallel data, models trained on our weak classifier labeled dataset achieve state-of-the-art performance on the ASSET simplification benchmark. Our models also outperform previous work on sentence-level targeting. Finally, we establish how a handful of Large Language Models perform on these tasks under a zero-shot setting.