code: def FBResNet50(num_classes=1000):
      """Constructs a ResNet-50 model.
  
      Args:
          num_classes
      """
      model = FBResNet(
          Bottleneck, [3, 4, 6, 3], num_classes=num_classes
      )
      return model
  
imports: import torch.nn
  import torch.nn.functional
  import math
  import torch.utils.model_zoo
label_desc: Use image node_id 4 for calling a global function with example usage: FBResNet50(num_classes) and returns: model