code: def forward(self, x):
      return self._forward_impl(x)
  
file_path: deep-learning-for-image-processing/pytorch_segmentation/fcn/src/backbone.py
imports: import torch
  import torch.nn
label_desc: Use image node_id 4 for calling the ResNet obj's underlying member method code with example usage: obj.forward(x) and returns: self