Merge pull request #1245 from rwightman/vit_relpos_refactor

Vision Transformer refactoring and Rel Pos impl

Author: rwightman

README.md

@@ -23,6 +23,15 @@ I'm fortunate to be able to dedicate significant time and money of my own suppor
 
 ## What's New
 
+
+### May 2, 2022
+* Vision Transformer experiments adding Relative Position (Swin-V2 log-coord) (`vision_transformer_relpos.py`) and Residual Post-Norm branches (from Swin-V2) (`vision_transformer*.py`)
+  * `vit_relpos_base_patch32_plus_rpn_256` - 79.5 @ 256, 80.6 @ 320 -- rel pos + extended width + res-post-norm, no class token, avg pool
+  * `vit_relpos_base_patch16_224` - 82.5 @ 224, 83.6 @ 320 -- rel pos, layer scale, no class token, avg pool
+  * `vit_base_patch16_rpn_224` - 82.3 @ 224 -- rel pos + res-post-norm, no class token, avg pool
+* Vision Transformer refactor to remove representation layer that was only used in initial vit and rarely used since with newer pretrain (ie `How to Train Your ViT`)
+* `vit_*` models support removal of class token, use of global average pool, use of fc_norm (ala beit, mae).
+
 ### April 22, 2022
 * `timm` models are now officially supported in [fast.ai](https://www.fast.ai/)! Just in time for the new Practical Deep Learning course. `timmdocs` documentation link updated to [timm.fast.ai](http://timm.fast.ai/).
 * Two more model weights added in the TPU trained [series](https://github.com/rwightman/pytorch-image-models/releases/tag/v0.1-tpu-weights). Some In22k pretrain still in progress.

timm/models/__init__.py

@@ -49,6 +49,7 @@
 from .visformer import *
 from .vision_transformer import *
 from .vision_transformer_hybrid import *
+from .vision_transformer_relpos import *
 from .volo import *
 from .vovnet import *
 from .xception import *