Next version enhancement

[Alireza]

Hi everybody!!
PyTorch project has introduced TorchVision’s New Multi-Weight Support API.
In the new API the boolean "pretrained" and "pretrained_backbone" parameters, which were previously used to load weights to the full model or to its backbone, are deprecated.

https://pytorch.org/blog/introducing-torchvision-new-multi-weight-support-api/