code: def get_random_node_pair(n):
      """
      Randomly generates a pair of nodes.
      """
      i = np.random.randint(0, n)
      j = i
      while j == i:
          j = np.random.randint(0, n)
      return i, j
  
imports: import re
  from queue import LifoQueue
  import networkx
  import numpy
  from networkx.algorithms.dag import is_directed_acyclic_graph
  from networkx.algorithms.shortest_paths.generic import shortest_path
  from dowhy.utils.ordered_set import OrderedSet
label_desc: Use image node_id 11 for calling a global function with example usage: get_random_node_pair(n) and returns: i,  j