LookBack: Where and How to Score LVLM Responses via Visual Reference Usage
LookBack, a training-free LVLM response scoring method that augments token likelihood with visual lookback score, a lightweight measure of how strongly each response token refers to image tokens, consistently improves Best-of-$N$ selection over existing baselines with negligible additional overhead.
Beomsik Cho, Jinhyeong Kim, Dongseok Lee et al.
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