code: def connect(parent, child):
      """
      Make an edge between a parent
      node and a child node.
      a - parent
      b - child
      """
      parent.children.append(child)
      child.parents.append(parent)
  
file_path: causalnex/causalnex/ebaybbn/graph.py
label_desc: Use image node_id 1 for calling a global function with example usage: connect(parent, child) without return types