transformers

91ff7efe - [DETR and friends] Use AutoBackbone as alternative to timm (#20833)

[DETR and friends] Use AutoBackbone as alternative to timm (#20833) * First draft * More improvements * Add conversion script * More improvements * Add docs * Address review * Rename class to ConvEncoder * Address review * Apply suggestion * Apply suggestions from code review Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com> * Update all DETR friends * Add corresponding test * Improve test * Fix bug * Add more tests * Set out_features to last stage by default Co-authored-by: Niels Rogge <nielsrogge@Nielss-MacBook-Pro.local> Co-authored-by: Niels Rogge <nielsrogge@Nielss-MBP.localdomain> Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>