提出可约束的细粒度情感反事实编辑框架,提升模型对具体方面的情感推理可信度。
Constraint-Aware Counterfactual Editing for Aspect-Based Sentiment Analysis
- 分步生成并验证仅改变目标方面的反事实样本
- 确保非目标方面情感、语义和事实一致性不变
- 适合评估和增强情感分析模型的鲁棒性
方面级情感分析(ABSA)要求模型识别针对特定方面的态度,而非依赖句子整体极性。这使得反事实评估尤为困难:有效的反事实应仅改变目标方面的极性,同时保持其他非目标方面的情感、语义流畅性与事实一致性。现有方法多关注句级标签翻转,常产生流畅但方面无效、语义偏移或矛盾的修改。为此,我们提出CAVE-ABSA——一种约束感知的验证式编辑框架,用于生成与验证方面级反事实样本。该框架定位目标方面的意见片段,进行可控重写,通过修复模块优化候选样本,并利用方面级验证、语义相似性、AMR引导的结构保持、编辑最小性、流畅性及矛盾检测进行过滤。该框架旨在构建经验证的反事实ABSA数据集,用于模型鲁棒性评估与数据增强。通过显式分离生成与验证,CAVE-ABSA提供了一种系统化方法,生成有意义的方面级反事实,并检验模型是否真正依赖于方面基础的情感推理。
原文摘要 · Abstract (English)
Aspect-Based Sentiment Analysis (ABSA) requires models to identify sentiment toward specific aspects rather than relying on the global polarity of a sentence. This makes counterfactual evaluation especially challenging: a valid counterfactual should flip the sentiment of one target aspect while preserving the sentiment of all non-target aspects, semantic meaning, fluency, and factual consistency. Existing counterfactual generation methods often focus on sentence-level label flipping and may produce edits that are fluent but aspect-invalid, semantically drifting, or contradictory. To address this limitation, we propose CAVE-ABSA, a Constraint-Aware Validated Editing framework for generating and validating aspect-level counterfactuals. CAVE-ABSA localizes the opinion span associated with the target aspect, performs controlled counterfactual rewriting, refines candidates through a repair module, and filters them using aspect-level verification, semantic similarity, AMR-guided structural preservation, edit minimality, fluency, and contradiction detection. The framework is designed to construct validated counterfactual ABSA datasets for robustness evaluation and data augmentation. By explicitly separating generation from validation, CAVE-ABSA provides a principled approach for producing meaningful aspect-local counterfactuals and for testing whether ABSA models truly rely on aspect-grounded sentiment reasoning.
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