GitLab

* Enable instantiating model with pretrained backbone weights

* Clarify pretrained import

* Use load_backbone instead

* Add backbone_kwargs to config

* Fix up

* Add tests

* Tidy up

* Enable instantiating model with pretrained backbone weights

* Update tests so backbone checkpoint isn't passed in

* Clarify pretrained import

* Update configs - docs and validation check

* Update src/transformers/utils/backbone_utils.py
Co-authored-by: Arthur <48595927+ArthurZucker@users.noreply.github.com>

* Clarify exception message

* Update config init in tests

* Add test for when use_timm_backbone=True

* Use load_backbone instead

* Add use_timm_backbone to the model configs

* Add backbone_kwargs to config

* Pass kwargs to constructors

* Draft

* Fix tests

* Add back timm - weight naming

* More tidying up

* Whoops

* Tidy up

* Handle when kwargs are none

* Update tests

* Revert test changes

* Deformable detr test - don't use default

* Don't mutate; correct model attributes

* Add some clarifying comments

* nit - grammar is hard

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Co-authored-by: Arthur <48595927+ArthurZucker@users.noreply.github.com>