transformers

aafa7ce7 - [`DETR`] Remove timm hardcoded logic in modeling files (#29038)

[`DETR`] Remove timm hardcoded logic in modeling files (#29038) * 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 --------- Co-authored-by: Arthur <48595927+ArthurZucker@users.noreply.github.com>