A Survey of Event Causality Identification: Taxonomy, Challenges, Assessment, and Prospects

TL;DR

This survey comprehensively reviews event causality identification in NLP, categorizing models, evaluating their performance, and discussing future challenges and prospects for improving causal relation detection in texts.

Contribution

It provides a systematic taxonomy of ECI models, evaluates diverse approaches across multiple datasets, and highlights recent advancements like multilingual and zero-shot ECI with large language models.

Findings

Deep semantic encoding improves ECI accuracy.

Prompt-based fine-tuning enhances model adaptability.

Zero-shot ECI with LLMs shows promising results.

Abstract

Event Causality Identification (ECI) has become an essential task in Natural Language Processing (NLP), focused on automatically detecting causal relationships between events within texts. This comprehensive survey systematically investigates fundamental concepts and models, developing a systematic taxonomy and critically evaluating diverse models. We begin by defining core concepts, formalizing the ECI problem, and outlining standard evaluation protocols. Our classification framework divides ECI models into two primary tasks: Sentence-level Event Causality Identification (SECI) and Document-level Event Causality Identification (DECI). For SECI, we review models employing feature pattern-based matching, machine learning classifiers, deep semantic encoding, prompt-based fine-tuning, and causal knowledge pre-training, alongside data augmentation strategies. For DECI, we focus on approaches utilizing deep semantic encoding, event graph reasoning, and prompt-based fine-tuning. Special attention is given to recent advancements in multi-lingual and cross-lingual ECI, as well as zero-shot ECI leveraging Large Language Models (LLMs). We analyze the strengths, limitations, and unresolved challenges associated with each approach. Extensive quantitative evaluations are conducted on four benchmark datasets to rigorously assess the performance of various ECI models. We conclude by discussing future research directions and highlighting opportunities to advance the field further.