Davit std (#6)

Separate patch_embed module

timm/models/davit.py

@@ -12,25 +12,21 @@ DaViT model defs and weights adapted from https://github.com/dingmyu/davit, orig
 # All rights reserved.
 # This source code is licensed under the MIT license
 
-# FIXME remove unused imports
-
 import itertools
-from typing import Any, Dict, Iterable, Iterator, List, Mapping, Optional, overload, Tuple, TypeVar, Union
-from collections import OrderedDict
 
 import torch
 import torch.nn as nn
 import torch.nn.functional as F
 from torch import Tensor
-import torch.utils.checkpoint as checkpoint
 
-from .features import FeatureInfo
-from .fx_features import register_notrace_function, register_notrace_module
-from .helpers import build_model_with_cfg, pretrained_cfg_for_features
-from .layers import DropPath, to_2tuple, trunc_normal_, SelectAdaptivePool2d, ClassifierHead, Mlp
-from .pretrained import generate_default_cfgs
-from .registry import register_model
 from timm.data import IMAGENET_DEFAULT_MEAN, IMAGENET_DEFAULT_STD
+from timm.layers import DropPath, to_2tuple, trunc_normal_, ClassifierHead, Mlp
+from ._builder import build_model_with_cfg
+from ._features import FeatureInfo
+from ._features_fx import register_notrace_function
+from ._manipulate import checkpoint_seq
+from ._pretrained import generate_default_cfgs
+from ._registry import register_model
 
 __all__ = ['DaViT']
 
@@ -391,7 +387,7 @@ class DaViTStage(nn.Module):
                         mlp_ratio=mlp_ratio,
                         qkv_bias=qkv_bias,
                         drop_path=drop_path_rates[len(attention_types) * block_idx + attention_id],
-                        norm_layer=nn.LayerNorm,
+                        norm_layer=norm_layer,
                         ffn=ffn,
                         cpe_act=cpe_act,
                         window_size=window_size,
@@ -403,7 +399,7 @@ class DaViTStage(nn.Module):
                         mlp_ratio=mlp_ratio,
                         qkv_bias=qkv_bias,
                         drop_path=drop_path_rates[len(attention_types) * block_idx + attention_id],
-                        norm_layer=nn.LayerNorm,
+                        norm_layer=norm_layer,
                         ffn=ffn,
                         cpe_act=cpe_act
                     ))
@@ -476,7 +472,8 @@ class DaViT(nn.Module):
         self.drop_rate=drop_rate
         self.grad_checkpointing = False
         self.feature_info = []
-
+        
+        self.patch_embed = None
         stages = []
         
         for stage_id in range(self.num_stages):
@@ -499,6 +496,10 @@ class DaViT(nn.Module):
                 cpe_act = cpe_act
             )
             
+            if stage_id == 0:
+                self.patch_embed = stage.patch_embed
+                stage.patch_embed = nn.Identity()
+            
             stages.append(stage)
             self.feature_info += [dict(num_chs=self.embed_dims[stage_id], reduction=2, module=f'stages.{stage_id}')]
         
@@ -533,6 +534,7 @@ class DaViT(nn.Module):
         self.head = ClassifierHead(self.num_features, num_classes, pool_type=global_pool, drop_rate=self.drop_rate)
 
     def forward_features(self, x):
+        x = self.patch_embed(x)
         x = self.stages(x)
         # take final feature and norm
         x = self.norms(x.permute(0, 2, 3, 1)).permute(0, 3, 1, 2)
@@ -562,8 +564,10 @@ def checkpoint_filter_fn(state_dict, model):
     import re
     out_dict = {}
     for k, v in state_dict.items():
+        
         k = re.sub(r'patch_embeds.([0-9]+)', r'stages.\1.patch_embed', k)
         k = re.sub(r'main_blocks.([0-9]+)', r'stages.\1.blocks', k)
+        k = k.replace('stages.0.patch_embed', 'patch_embed')
         k = k.replace('head.', 'head.fc.')
         k = k.replace('cpe.0', 'cpe1')
         k = k.replace('cpe.1', 'cpe2')
@@ -596,12 +600,13 @@ def _cfg(url='', **kwargs): # not sure how this should be set up
         'num_classes': 1000, 'input_size': (3, 224, 224), 'pool_size': (7, 7),
         'crop_pct': 0.875, 'interpolation': 'bilinear',
         'mean': IMAGENET_DEFAULT_MEAN, 'std': IMAGENET_DEFAULT_STD,
-        'first_conv': 'stages.0.patch_embed.proj', 'classifier': 'head.fc',
+        'first_conv': 'patch_embed.proj', 'classifier': 'head.fc',
         **kwargs
     }
 
 
 
+# TODO contact authors to get larger pretrained models
 default_cfgs = generate_default_cfgs({
     # official microsoft weights from https://github.com/dingmyu/davit
     'davit_tiny.msft_in1k': _cfg(
@@ -635,8 +640,6 @@ def davit_base(pretrained=False, **kwargs):
     num_heads=(4, 8, 16, 32), **kwargs)
     return _create_davit('davit_base', pretrained=pretrained, **model_kwargs)
 
-
-# TODO contact authors to get larger pretrained models
 @register_model
 def davit_large(pretrained=False, **kwargs):
     model_kwargs = dict(depths=(1, 1, 9, 1), embed_dims=(192, 384, 768, 1536),