how use custom pre-trained backbone in mask2former

[sleepat-11]

Your work is excellent and impressive!
But I have a little question how to load my own pre-trained backbone to replace the origin backbone, for example .i got a vit pre-trained model ,which is a pth or pt file, how to load pth in detectron2? do i have to tranfer it into pkl file by convert-torchvision-to-d2.py?
Thanks again for your great work!

[sleepat-11]

and i also need to freeze my backbone parameters? how to do that?