code: def is_full(cm, nodes1, nodes2):
      
      if not nodes1 or not nodes2:
          return True
  
      cm = cm[np.ix_(nodes1, nodes2)]
  
      # Do all nodes have at least one connection?
      return cm.sum(0).all() and cm.sum(1).all()
docs: Test connectivity of one set of nodes to another.
  
      Args:
          cm (``np.ndarrray``): The connectivity matrix
          nodes1 (tuple[int]): The nodes whose outputs to ``nodes2`` will be
              tested.
          nodes2 (tuple[int]): The nodes whose inputs from ``nodes1`` will
              be tested.
  
      Returns:
          bool: ``True`` if all elements in ``nodes1`` output to some element in
          ``nodes2`` and all elements in ``nodes2`` have an input from some
          element in ``nodes1``, or if either set of nodes is empty; ``False``
          otherwise.