code: def add_node(self, agent_type=None, state=None, name='network_process', **state_params):
          
          agent_id = int(len(self.global_topology.nodes()))
          agent = agent_type(self.env, agent_id=agent_id, state=state, name=name, **state_params)
          self.global_topology.add_node(agent_id, {'agent': agent})
          return agent_id
docs: Add a new node to the current network
  
          Parameters
          ----------
          agent_type : NetworkAgent subclass
              Agent in the new node will be instantiated using this agent class
          state : object
              State of the Agent, this may be an integer or string or any other
          name : str, optional
              Descriptive name of the agent
          state_params : keyword arguments, optional
              Key-value pairs of other state parameters for the agent
  
          Return
          ------
          int
              Agent ID of the new node