TY - JOUR AU - Jia, Zixia AU - Yan, Zhaohui AU - Wu, Haoyi AU - Tu, Kewei PY - 2022/06/28 Y2 - 2024/03/29 TI - Span-Based Semantic Role Labeling with Argument Pruning and Second-Order Inference JF - Proceedings of the AAAI Conference on Artificial Intelligence JA - AAAI VL - 36 IS - 10 SE - AAAI Technical Track on Speech and Natural Language Processing DO - 10.1609/aaai.v36i10.21328 UR - https://ojs.aaai.org/index.php/AAAI/article/view/21328 SP - 10822-10830 AB - We study graph-based approaches to span-based semantic role labeling. This task is difficult due to the need to enumerate all possible predicate-argument pairs and the high degree of imbalance between positive and negative samples. Based on these difficulties, high-order inference that considers interactions between multiple arguments and predicates is often deemed beneficial but has rarely been used in span-based semantic role labeling. Because even for second-order inference, there are already O(n^5) parts for a sentence of length n, and exact high-order inference is intractable. In this paper, we propose a framework consisting of two networks: a predicate-agnostic argument pruning network that reduces the number of candidate arguments to O(n), and a semantic role labeling network with an optional second-order decoder that is unfolded from an approximate inference algorithm. Our experiments show that our framework achieves significant and consistent improvement over previous approaches. ER -