Add 'head norm first' convnext_tiny_hnf weights

Author: rwightman

timm/models/convnext.py

@@ -44,7 +44,9 @@ def _cfg(url='', **kwargs):
     convnext_large=_cfg(url="https://dl.fbaipublicfiles.com/convnext/convnext_large_1k_224_ema.pth"),
 
     convnext_nano_hnf=_cfg(url=''),
-    convnext_tiny_hnf=_cfg(url=''),
+    convnext_tiny_hnf=_cfg(
+        url='https://github.com/rwightman/pytorch-image-models/releases/download/v0.1-rsb-weights/convnext_tiny_hnf_a2h-ab7e9df2.pth',
+        crop_pct=0.95),
 
     convnext_base_in22ft1k=_cfg(
         url='https://dl.fbaipublicfiles.com/convnext/convnext_base_22k_1k_224.pth'),
@@ -322,6 +324,8 @@ def _init_weights(module, name=None, head_init_scale=1.0):
 
 def checkpoint_filter_fn(state_dict, model):
     """ Remap FB checkpoints -> timm """
+    if 'head.norm.weight' in state_dict or 'norm_pre.weight' in state_dict:
+        return state_dict  # non-FB checkpoint
     if 'model' in state_dict:
         state_dict = state_dict['model']
     out_dict = {}