Merge branch 'adding_ECA_resnet' of https://github.com/yoniaflalo/pytorch-image-models into yoniaflalo-adding_ECA_resnet

Author: rwightman

timm/models/helpers.py

@@ -1,8 +1,11 @@
 import torch
+import torch.nn as nn
+from copy import deepcopy
 import torch.utils.model_zoo as model_zoo
 import os
 import logging
 from collections import OrderedDict
+from timm.models.layers.conv2d_same import Conv2dSame
 
 
 def load_state_dict(checkpoint_path, use_ema=False):
@@ -101,4 +104,91 @@ def load_pretrained(model, cfg=None, num_classes=1000, in_chans=3, filter_fn=Non
 
 
 
-
+def extract_layer(model, layer):
+    layer = layer.split('.')
+    module = model
+    if hasattr(model, 'module') and layer[0] != 'module':
+        module = model.module
+    if not hasattr(model, 'module') and layer[0] == 'module':
+        layer = layer[1:]
+    for l in layer:
+        if hasattr(module, l):
+            if not l.isdigit():
+                module = getattr(module, l)
+            else:
+                module = module[int(l)]
+        else:
+            return module
+    return module
+
+
+def set_layer(model, layer, val):
+    layer = layer.split('.')
+    module = model
+    if hasattr(model, 'module') and layer[0] != 'module':
+        module = model.module
+    lst_index = 0
+    module2 = module
+    for l in layer:
+        if hasattr(module2, l):
+            if not l.isdigit():
+                module2 = getattr(module2, l)
+            else:
+                module2 = module2[int(l)]
+            lst_index += 1
+    lst_index -= 1
+    for l in layer[:lst_index]:
+        if not l.isdigit():
+            module = getattr(module, l)
+        else:
+            module = module[int(l)]
+    l = layer[lst_index]
+    setattr(module, l, val)
+
+
+def adapt_model_from_string(parent_module, model_string):
+    separator = '***'
+    state_dict = {}
+    lst_shape = model_string.split(separator)
+    for k in lst_shape:
+        k = k.split(':')
+        key = k[0]
+        shape = k[1][1:-1].split(',')
+        if shape[0] != '':
+            state_dict[key] = [int(i) for i in shape]
+
+    new_module = deepcopy(parent_module)
+    for n, m in parent_module.named_modules():
+        old_module = extract_layer(parent_module, n)
+        if isinstance(old_module, nn.Conv2d) or isinstance(old_module, Conv2dSame):
+            if isinstance(old_module, Conv2dSame):
+                conv = Conv2dSame
+            else:
+                conv = nn.Conv2d
+            s = state_dict[n + '.weight']
+            in_channels = s[1]
+            out_channels = s[0]
+            if old_module.groups > 1:
+                in_channels = out_channels
+                g = in_channels
+            else:
+                g = 1
+            new_conv = conv(in_channels=in_channels, out_channels=out_channels,
+                            kernel_size=old_module.kernel_size, bias=old_module.bias is not None,
+                            padding=old_module.padding, dilation=old_module.dilation,
+                            groups=g, stride=old_module.stride)
+            set_layer(new_module, n, new_conv)
+        if isinstance(old_module, nn.BatchNorm2d):
+            new_bn = nn.BatchNorm2d(num_features=state_dict[n + '.weight'][0], eps=old_module.eps,
+                                    momentum=old_module.momentum,
+                                    affine=old_module.affine,
+                                    track_running_stats=True)
+            set_layer(new_module, n, new_bn)
+        if isinstance(old_module, nn.Linear):
+            new_fc = nn.Linear(in_features=state_dict[n + '.weight'][1], out_features=old_module.out_features,
+                               bias=old_module.bias is not None)
+            set_layer(new_module, n, new_fc)
+    new_module.eval()
+    parent_module.eval()
+
+    return new_module