arXiv Computation and Language By Adarsh Sudheer, David Li, Omar Elbanna, Ishaan Kodarapu, Arjun Bahuguna, Vasu Sharma

Compositional Failure in Audio-Visual LLMs: Late-Layer Prior Dominance Under Cross-modal Conflict

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The paper investigates audio‑visual conflict as a test of compositional generalization for audio‑visual large language models (AV‑LLMs). It shows that models such as VideoLLaMA 2‑7B‑AV and InternVideo2 exhibit a failure mode called prior dominance, where late‑layer commitment to an internally preferred answer pattern overrides conflicting audio‑visual inputs, leading to significant accuracy drops. Mechanistic analysis reveals that this commitment is concentrated around layer 25.5 and that stronger temporal alignment shifts answer bias but does not resolve the conflict.

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