ClarET: Pre-training a Correlation-Aware Context-To-Event Transformer for Event-Centric Generation and Classification

Yucheng Zhou, Tao Shen, Xiubo Geng, Guodong Long, Daxin Jiang


Abstract
Generating new events given context with correlated ones plays a crucial role in many event-centric reasoning tasks. Existing works either limit their scope to specific scenarios or overlook event-level correlations. In this paper, we propose to pre-train a general Correlation-aware context-to-Event Transformer (ClarET) for event-centric reasoning. To achieve this, we propose three novel event-centric objectives, i.e., whole event recovering, contrastive event-correlation encoding and prompt-based event locating, which highlight event-level correlations with effective training. The proposed ClarET is applicable to a wide range of event-centric reasoning scenarios, considering its versatility of (i) event-correlation types (e.g., causal, temporal, contrast), (ii) application formulations (i.e., generation and classification), and (iii) reasoning types (e.g., abductive, counterfactual and ending reasoning). Empirical fine-tuning results, as well as zero- and few-shot learning, on 9 benchmarks (5 generation and 4 classification tasks covering 4 reasoning types with diverse event correlations), verify its effectiveness and generalization ability.
Anthology ID:
2022.acl-long.183
Volume:
Proceedings of the 60th Annual Meeting of the Association for Computational Linguistics (Volume 1: Long Papers)
Month:
May
Year:
2022
Address:
Dublin, Ireland
Venue:
ACL
SIG:
Publisher:
Association for Computational Linguistics
Note:
Pages:
2559–2575
Language:
URL:
https://aclanthology.org/2022.acl-long.183
DOI:
10.18653/v1/2022.acl-long.183
Bibkey:
Cite (ACL):
Yucheng Zhou, Tao Shen, Xiubo Geng, Guodong Long, and Daxin Jiang. 2022. ClarET: Pre-training a Correlation-Aware Context-To-Event Transformer for Event-Centric Generation and Classification. In Proceedings of the 60th Annual Meeting of the Association for Computational Linguistics (Volume 1: Long Papers), pages 2559–2575, Dublin, Ireland. Association for Computational Linguistics.
Cite (Informal):
ClarET: Pre-training a Correlation-Aware Context-To-Event Transformer for Event-Centric Generation and Classification (Zhou et al., ACL 2022)
Copy Citation:
PDF:
https://aclanthology.org/2022.acl-long.183.pdf
Software:
 2022.acl-long.183.software.zip
Code
 yczhou001/ClarET
Data
GLUEROCStories