IoUPD: IoU-Aware Privileged Distillation for Visual Grounding with Multimodal Large Language Models arXiv new; privileged distillation for MLLM grounding 原文链接
Figureure 1 · : Overview of IOU-PDFigure 1: Overview of IOU-PD. Ground-truth boxes are used not only as coordinate targets, but also to construct privileged teacher inputs during training. The student receives the original image and original referring-expression prompt, while the teacher receives a box-marked image and an augmented prompt that indicates the marked region. The training objective combines an SFT anchor with IoU-aware privileged distillation, while keeping the inference-time input format unchanged.这张图概括 IoUPD 的整体方法流程。阅读时先看模块之间传递的训练信号,再看作者如何把目标拆成可优化的子问题。Figureure 5 · : IOU-PD improves grounding across object sizesFigure 5: IOU-PD improves grounding across object sizes. Examples are grouped by the ground-truth bounding-box area in the normalized coordinate space: small (< 5%), medium (5%−10%), and large (> 10%). Points report P@0.5 and P@0.7 for the base model and the IOU-PD model, with orange segments and labels indicating absolute gains.这张可视化用来解释 IoUPD 学到的中间表征或对齐关系。重点看它是否支持正文里的机制判断。