loading pretrained about the class MMDetBackbone

[Shuntw6096]

I find the class MMDetBackbone has a keyword argument pretrained_backbone, but it seems that function about loading pretrained_backbone is not implemented, will it fix?

detectron2/detectron2/modeling/mmdet_wrapper.py

Lines 59 to 60 in e9cbe90

	pretrained_backbone: defines the backbone weights that can be loaded by
	mmdet, such as "torchvision://resnet50".

because I use SwinTransformer from mmdet, and loading pretrained was implemented in mmdet

https://github.com/open-mmlab/mmdetection/blob/5e246d5e3bc3310b5c625fb57bc03d2338ca39bc/configs/swin/mask_rcnn_swin-t-p4-w7_fpn_1x_coco.py#L26

[ppwwyyxx]

You're right. The documentation is for older mmdet and should be removed now. The correct way to initialize is to use init_cfg.