Grounded or Guessing? LVLM Confidence Estimation via Blind-Image Contrastive Ranking
Vision-language models routinely generate plausible outputs driven by text priors alone, with images playing no role in the prediction. This 'visual ungroundedness' defeats existing confidence metrics because they cannot distinguish between image-informed and image-agnostic reasoning. BICR addresses this by training a lightweight probe on contrastive hidden states extracted from frozen LVLMs under two conditions: normal inference with images present, and inference with images blacked out. The method surfaces whether a model's confidence reflects genuine visual grounding or mere language pattern matching, a critical diagnostic for production deployments where hallucination risk is high.
Modelwire context
ExplainerThe deeper issue BICR surfaces is not just hallucination frequency but hallucination source: a model can produce a correct answer for entirely the wrong reason, and existing confidence scores cannot tell the difference. That distinction matters enormously for any deployment where you need to know whether the model is actually reading the image or confabulating from text patterns.
This connects to a broader reliability gap that WildClawBench (covered the same day) also exposes from a different angle: synthetic evaluation metrics routinely miss failure modes that only appear under realistic conditions. BICR's blind-image contrastive approach is essentially doing the same thing at the inference level that WildClawBench does at the task level, forcing the model into a condition that reveals whether its apparent competence is genuine. Both papers are pushing toward the same conclusion: that standard forward-pass evaluation is insufficient for production credibility.
The probe is trained on frozen LVLM hidden states, so watch whether the method holds when applied to models it was not trained on. If BICR's grounding signal transfers across model families without retraining, it becomes a practical deployment tool; if it requires per-model calibration, its utility narrows considerably.
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MentionsBICR · Large Vision-Language Models · arXiv
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