code: def add_child(self, child):
      child.parent = self
      self.num_children += 1
      self.children.append(child)
  
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 2 for calling the Tree obj's underlying member method code with example usage: obj.add_child(child) without return types