* Enable instantiating model with pretrained backbone weights
* Update tests so backbone checkpoint isn't passed in
* Remove doc updates until changes made in modeling code
* 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
* Small test updates
---------
Co-authored-by: Arthur <48595927+ArthurZucker@users.noreply.github.com>
* First draft
* More improvements
* More improvements
* Make all tests pass
* Remove script
* Update image processor
* Address comments
* Use new gradient checkpointing method
* Convert checkpoints, add integration test
* Do not keep aspect ratio for now
* Set keep_aspect_ratio=False for beit, add integration test
* Remove print statement
