def __init__(
self,
input_size=224,
width_mult=1.,
pretrained=True,
pooling=None,
pooling_kwargs=None,
):
super().__init__()
net = MobileNetV2(input_size=input_size,
width_mult=width_mult,
pretrained=pretrained)
self.encoder = list(net.encoder.children())
if pooling is not None:
pooling_kwargs = pooling_kwargs or {}
pooling_layer_fn = MODULES.get(pooling)
pooling_layer = pooling_layer_fn(
in_features=self.last_channel, **pooling_kwargs) \
if "attn" in pooling.lower() \
else pooling_layer_fn(**pooling_kwargs)
self.encoder.append(pooling_layer)
out_features = pooling_layer.out_features(
in_features=net.output_channel)
else:
out_features = net.output_channel
self.out_features = out_features
# make it nn.Sequential
self.encoder = nn.Sequential(*self.encoder)
self._initialize_weights()
def __init__(self,
arch="resnet34",
pretrained=True,
frozen=True,
pooling=None,
pooling_kwargs=None,
cut_layers=2):
super().__init__()
resnet = torchvision.models.__dict__[arch](pretrained=pretrained)
modules = list(resnet.children())[:-cut_layers] # delete last layers
if frozen:
for module in modules:
for param in module.parameters():
param.requires_grad = False
if pooling is not None:
pooling_kwargs = pooling_kwargs or {}
pooling_layer_fn = MODULES.get(pooling)
pooling_layer = pooling_layer_fn(
in_features=resnet.fc.in_features, **pooling_kwargs) \
if "attn" in pooling.lower() \
else pooling_layer_fn(**pooling_kwargs)
modules += [pooling_layer]
out_features = pooling_layer.out_features(
in_features=resnet.fc.in_features)
else:
out_features = resnet.fc.in_features
modules += [Flatten()]
self.out_features = out_features
self.encoder = nn.Sequential(*modules)
def __init__(
self,
arch: str = "resnet18",
pretrained: bool = True,
frozen: bool = True,
pooling: str = None,
pooling_kwargs: dict = None,
cut_layers: int = 2,
state_dict: Union[dict, str, Path] = None,
):
"""
Args:
arch (str): Name for resnet. Have to be one of
resnet18, resnet34, resnet50, resnet101, resnet152
pretrained (bool): If True, returns a model pre-trained on ImageNet
frozen (bool): If frozen, sets requires_grad to False
pooling (str): pooling
pooling_kwargs (dict): params for pooling
state_dict (Union[dict, str, Path]): Path to ``torch.Model``
or a dict containing parameters and persistent buffers.
"""
super().__init__()
resnet = torchvision.models.__dict__[arch](pretrained=pretrained)
if state_dict is not None:
if isinstance(state_dict, (Path, str)):
state_dict = torch.load(str(state_dict))
resnet.load_state_dict(state_dict)
modules = list(resnet.children())[:-cut_layers] # delete last layers
if frozen:
for module in modules:
utils.set_requires_grad(module, requires_grad=False)
if pooling is not None:
pooling_kwargs = pooling_kwargs or {}
pooling_layer_fn = MODULES.get(pooling)
pooling_layer = (pooling_layer_fn(
in_features=resnet.fc.in_features, **pooling_kwargs) if "attn"
in pooling.lower() else pooling_layer_fn(
**pooling_kwargs))
modules += [pooling_layer]
if hasattr(pooling_layer, "out_features"):
out_features = pooling_layer.out_features(
in_features=resnet.fc.in_features)
else:
out_features = None
else:
out_features = resnet.fc.in_features
modules += [Flatten()]
self.out_features = out_features
self.encoder = nn.Sequential(*modules)