runtime error

lf.backbone_fn(pretrained=pretrained, **kwargs) File "/home/user/.local/lib/python3.8/site-packages/icevision/backbones/resnet_fpn.py", line 27, in resnet18_fpn return _resnet_fpn("resnet18", pretrained=pretrained, **kwargs) File "/home/user/.local/lib/python3.8/site-packages/icevision/backbones/resnet_fpn.py", line 20, in _resnet_fpn model = resnet_fpn_backbone(backbone_name=name, pretrained=pretrained, **kwargs) File "/home/user/.local/lib/python3.8/site-packages/torchvision/models/detection/backbone_utils.py", line 92, in resnet_fpn_backbone backbone = resnet.__dict__[backbone_name]( File "/home/user/.local/lib/python3.8/site-packages/torchvision/models/resnet.py", line 276, in resnet18 return _resnet('resnet18', BasicBlock, [2, 2, 2, 2], pretrained, progress, File "/home/user/.local/lib/python3.8/site-packages/torchvision/models/resnet.py", line 262, in _resnet state_dict = load_state_dict_from_url(model_urls[arch], File "/home/user/.local/lib/python3.8/site-packages/torch/hub.py", line 586, in load_state_dict_from_url download_url_to_file(url, cached_file, hash_prefix, progress=progress) File "/home/user/.local/lib/python3.8/site-packages/torch/hub.py", line 452, in download_url_to_file u = urlopen(req) File "/usr/local/lib/python3.8/urllib/request.py", line 222, in urlopen return opener.open(url, data, timeout) File "/usr/local/lib/python3.8/urllib/request.py", line 525, in open response = self._open(req, data) File "/usr/local/lib/python3.8/urllib/request.py", line 542, in _open result = self._call_chain(self.handle_open, protocol, protocol + File "/usr/local/lib/python3.8/urllib/request.py", line 502, in _call_chain result = func(*args) File "/usr/local/lib/python3.8/urllib/request.py", line 1397, in https_open return self.do_open(http.client.HTTPSConnection, req, File "/usr/local/lib/python3.8/urllib/request.py", line 1357, in do_open raise URLError(err) urllib.error.URLError: <urlopen error [Errno 101] Network is unreachable>

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