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AffToM: Benchmarking Recursive Affective Theory of Mind in Dynamic Multi-Party Interactions

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AffToM is a new benchmark for affective Theory of Mind (ToM) in dynamic multi‑party interactions, comprising 1,922 test pairs and 19,759 training pairs. It evaluates Individual Affective Reasoning (IAR) and Multi‑party Affective Reasoning (MPAR), the latter tracking nested beliefs and emotions as events unfold. The authors introduce an event‑driven multi‑agent generation pipeline and a two‑stage post‑training framework, AffToM‑R1, which boosts MPAR accuracy by 13.38 percentage points over baseline models.

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