code: def xresnet50_2(pretrained=False, **kwargs):
      
      model = XResNet(Bottleneck, [3, 4, 6, 3], **kwargs)
      if pretrained: model.load_state_dict(model_zoo.load_url(model_urls['xresnet50']))
      return model
docs: Constructs a XResNet-50 model.
  
      Args:
          pretrained (bool): If True, returns a model pre-trained on ImageNet