Aspect Sentiment Understanding (ASU) in interactive scenarios (e.g., Question-Answering and Dialogue) has attracted ever-more interest in recent years and achieved important progresses. However, existing studies on interactive ASU largely ignore the coreference issue for opinion targets (i.e., aspects), while this phenomenon is ubiquitous in interactive scenarios especially dialogues, limiting the ASU performance. Recently, large language models (LLMs) shows the powerful ability to integrate various NLP tasks with the chat paradigm. In this way, this paper proposes a new Chat-based Aspect Sentiment Understanding (ChatASU) task, aiming to explore LLMs' ability in understanding aspect sentiments in dialogue scenarios. Particularly, this ChatASU task introduces a sub-task, i.e., Aspect Chain Reasoning (ACR) task, to address the aspect coreference issue. On this basis, we propose a Trusted Self-reflexion Approach (TSA) with ChatGLM as backbone to ChatASU. Specifically, this TSA treats the ACR task as an auxiliary task to boost the performance of the primary ASU task, and further integrates trusted learning into reflexion mechanisms to alleviate the LLMs-intrinsic factual hallucination problem in TSA. Furthermore, a high-quality ChatASU dataset is annotated to evaluate TSA, and extensive experiments show that our proposed TSA can significantly outperform several state-of-the-art baselines, justifying the effectiveness of TSA to ChatASU and the importance of considering the coreference and hallucination issues in ChatASU.

翻译：交互式场景（如问答与对话）中的方面情感理解（ASU）近年来备受关注并取得了重要进展。然而，现有交互式ASU研究普遍忽略了意见目标（即方面）的共指问题，而这一现象在交互式场景尤其是对话中广泛存在，限制了ASU的性能。近期，大语言模型（LLMs）展现出通过对话范式整合多种自然语言处理任务的强大能力。基于此，本文提出一项新的基于对话的方面情感理解任务（ChatASU），旨在探索LLMs在对话场景中理解方面情感的能力。特别地，ChatASU任务引入了一项子任务，即方面链推理（ACR）任务，以解决方面共指问题。在此基础上，我们提出了一种以ChatGLM为基座的可信自反思方法（TSA）用于ChatASU。具体而言，TSA将ACR任务作为辅助任务来提升主任务ASU的性能，并进一步将可信学习整合到反思机制中，以缓解TSA中LLMs固有的事实幻觉问题。此外，我们标注了一个高质量的ChatASU数据集来评估TSA，大量实验表明，我们提出的TSA显著优于多个当前最优基线模型，验证了TSA对ChatASU的有效性，以及考虑ChatASU中共指与幻觉问题的重要性。