code: def FBResNet18(num_classes=1000):
      """Constructs a ResNet-18 model.
  
      Args:
          num_classes
      """
      model = FBResNet(
          BasicBlock, [2, 2, 2, 2], 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 2 for calling a global function with example usage: FBResNet18(num_classes) and returns: model