Difference between chat model and REC model

[zhwuwuwu]

Hi, I've found the support of the downstream task, referring expression comprehension (REC)
and the model in HF, THUDM/cogvlm-grounding-generalist-hf
Want to ask if there's also the same support in CoGVLM2, thx.
更进一步，可以讲解一下chat model和生成bounding box model结构的区别吗？感谢