Chenkai Sun


2023

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Incorporating Task-Specific Concept Knowledge into Script Learning
Chenkai Sun | Tie Xu | ChengXiang Zhai | Heng Ji
Proceedings of the 17th Conference of the European Chapter of the Association for Computational Linguistics

In this paper, we present Tetris, a new task of Goal-Oriented Script Completion. Unlike previous work, it considers a more realistic and general setting, where the input includes not only the goal but also additional user context, including preferences and history. To address this problem, we propose a novel approach, which uses two techniques to improve performance: (1) concept prompting, and (2) script-oriented contrastive learning that addresses step repetition and hallucination problems. On our WikiHow-based dataset, we find that both methods improve performance.

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Measuring the Effect of Influential Messages on Varying Personas
Chenkai Sun | Jinning Li | Hou Pong Chan | ChengXiang Zhai | Heng Ji
Proceedings of the 61st Annual Meeting of the Association for Computational Linguistics (Volume 2: Short Papers)

Predicting how a user responds to news events enables important applications such as allowing intelligent agents or content producers to estimate the effect on different communities and revise unreleased messages to prevent unexpected bad outcomes such as social conflict and moral injury. We present a new task, Response Forecasting on Personas for News Media, to estimate the response a persona (characterizing an individual or a group) might have upon seeing a news message. Compared to the previous efforts which only predict generic comments to news, the proposed task not only introduces personalization in the modeling but also predicts the sentiment polarity and intensity of each response. This enables more accurate and comprehensive inference on the mental state of the persona. Meanwhile, the generated sentiment dimensions make the evaluation and application more reliable. We create the first benchmark dataset, which consists of 13,357 responses to 3,847 news headlines from Twitter. We further evaluate the SOTA neural language models with our dataset. The empirical results suggest that the included persona attributes are helpful for the performance of all response dimensions. Our analysis shows that the best-performing models are capable of predicting responses that are consistent with the personas, and as a byproduct, the task formulation also enables many interesting applications in the analysis of social network groups and their opinions, such as the discovery of extreme opinion groups.

2021

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HySPA: Hybrid Span Generation for Scalable Text-to-Graph Extraction
Liliang Ren | Chenkai Sun | Heng Ji | Julia Hockenmaier
Findings of the Association for Computational Linguistics: ACL-IJCNLP 2021