Reproduce Results on RefCOCO

[zgq1879]

Hi!

Thank you for the amazing work.

I tried to reproduce the results of PLM-3B on RefCOCO. After downloading the checkpoints from HF, I use the prompt as in https://github.com/facebookresearch/perception_models/blob/main/apps/plm/notebook_demos/image_grounding.ipynb but got about 50% Acc (IOU > 0.5) on RefCOCO-val. Could you please provide me with your official code of evaluating Image Grounding on RefCOCO? Thank you!