code: def __iter__(self):
      yield self
      for c in self.children:
          for x in c:
              yield x
  
file_path: DeepKE/src/deepke/attribution_extraction/standard/module/GCN.py
imports: import logging
  import torch
  import numpy
  import torch.nn
  import torch.nn.functional
label_desc: Use image node_id 4 for calling the Tree obj's underlying member method code with example usage: obj.__iter__() without return types