code: def pytorch_layer(self):
      return self.layer
  
imports: from mmdnn.conversion.common.DataStructure.graph import GraphNode, Graph
  import torch
  import torch.autograd
  import torch.serialization
  import contextlib
  from torch.jit import _unique_state_dict
label_desc: Use image node_id 4 for calling the PytorchGraphNode obj's underlying member method code with example usage: obj.pytorch_layer() and returns: self