docstr: Decide if to add a new node.
  If a new node should be added, update the graph.
docstr_tok: ["Decide","if","to","add","a","new","node",".","If","a","new","node","should","be","added",",","update","the","graph","."]
code: def add_node_and_update(self, a=None):
      """Decide if to add a new node.
      If a new node should be added, update the graph."""
  
      return self.add_node_agent(self.g, a)
  
imports: from functools import partial
  import dgl
  import torch
  import torch.nn
  import torch.nn.functional
  from torch.distributions import Bernoulli, Categorical
label_desc: Use image node_id 5 for calling the DGMG obj's underlying member method code with example usage: obj.add_node_and_update(a) and returns: self