Merge branch 'contrastive-master'

Merge pull request huggingface#475 from rwightman/pre-release/0.4.5

Prep for PyPi release. Tweak NFNet, ResNetV2, RexNet feature extraction, use pre-act features. Also, add act args to RexNet huggingface#202

Merge pull request huggingface#437 from rwightman/agc

Adaptive Gradient Clipping (AGC) Impl

Update README.md

Update README.md

Version 0.3.4. Tweak setup.cfg and update setup.py metadata

Update README.md

Add ViT to sotabench

Update README.md

Merge branch 'michalwols-docs'