HITSZ-HLT at SemEval-2021 Task 5: Ensemble Sequence Labeling and Span Boundary Detection for Toxic Span Detection
Qinglin Zhu, Zijie Lin, Yice Zhang, Jingyi Sun, Xiang Li, Qihui Lin, Yixue Dang, Ruifeng Xu · 2021
This paper presents the winning system that participated in SemEval-2021 Task 5: Toxic Spans Detection.This task aims to locate those spans that attribute to the text's toxicity within a text, which is crucial for semiautomated moderation in online discussions.We formalize this task as the Sequence Labeling (SL) problem and the Span Boundary Detection (SBD) problem separately and employ three state-of-the-art models.Next, we integrate predictions of these models to produce a more credible and complement result.Our system achieves a char-level score of 70.83%, ranking 1/91.In addition, we also explore the lexicon-based method, which is strongly interpretable and flexible in practice.