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arXiv · 2609.29230

EAGER: Enhancing Generative Event Extraction via Reinforcement Learning with Verifiable Rewards

Omar Adjali·Siting Liang·Omair Shahzad Bhatti·Daniel Sonntag
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Abstract

End-to-end event extraction remains challenging for large language models as it requires simultaneous identification of event triggers, classification of event types, and extraction of schema-grounded argument spans. We present EAGER, a reinforcement learning framework for generative event extraction that combines fine-grained verifiable rewards with Schema-Contrastive Advantage Estimation to alleviate advantage collapse under sparse binary rewards. Our reward design explicitly targets structural validity, extraction accuracy, groundedness, coverage, over-generation, and span precision. Experiments across seven benchmark datasets show that EAGER consistently outperforms prompting, supervised fine-tuning, and prior reinforcement learning baselines, achieving a substantial improvement over the strongest prior method. Results demonstrate that task-aligned verifiable rewards and contrastive advantage estimation substantially improve structured extraction.

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Omar Adjali, Siting Liang, Omair Shahzad Bhatti, Daniel Sonntag. 2026-09-24. EAGER: Enhancing Generative Event Extraction via Reinforcement Learning with Verifiable Rewards. https://arxiv.org/abs/2609.29230

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