This paper describes our system designed for SemEval-2023 Task 12: Sentiment analysis for African languages. The challenge faced by this task is the scarcity of labeled data and linguistic resources in low-resource settings. To alleviate these, we propose a generalized multilingual system SACL-XLMR for sentiment analysis on low-resource languages. Specifically, we design a lexicon-based multilingual BERT to facilitate language adaptation and sentiment-aware representation learning. Besides, we apply a supervised adversarial contrastive learning technique to learn sentiment-spread structured representations and enhance model generalization. Our system achieved competitive results, largely outperforming baselines on both multilingual and zero-shot sentiment classification subtasks. Notably, the system obtained the 1st rank on the zero-shot classification subtask in the official ranking. Extensive experiments demonstrate the effectiveness of our system.

本文描述了我们为SemEval-2023任务12而设计的系统：对非洲语言进行情感分析。为了缓解低资源环境下标记数据和语言资源的短缺问题，我们提出了一个通用的多语言系统SACL-XLMR，用于对低资源语言进行情感分析。我们的系统在多语言和零样本情感分类子任务中表现出色，并在零样本分类子任务中获得了官方排名的第一名。

UCAS-IIE-NLP在SemEval-2023任务12中的表现：增强低资源情感分析的多语言BERT泛化能力