code: def to_bidirected(edges):
      return np.concatenate((edges, edges[::-1, :]), axis=-1)
  
imports: import multiprocessing
  import random
  from multiprocessing import get_context
  import networkx
  import numpy
  import torch
  from tqdm.auto import tqdm
label_desc: Use image node_id 4 for calling a global function with example usage: to_bidirected(edges) and returns: np