def resnet18(pretrained=False):
  """Constructs a ResNet-18 model.
  Args:
    pretrained (bool): If True, returns a model pre-trained on ImageNet
  """
  model = ResNet(BasicBlock, [2, 2, 2, 2])
  if pretrained:
    model.load_state_dict(model_zoo.load_url(model_urls['resnet18']))
  return model
Constructs a ResNet-18 model.
  Args:
    pretrained (bool): If True, returns a model pre-trained on ImageNet
  
lib/model/fpn/resnet.py