code: def random_utf8(nchars):
      """
      Generate one random UTF8 string.
      """
      return "".join(np.random.choice(_RAND_CHARS, nchars))
  
imports: import contextlib
  import io
  import random
  import socket
  import subprocess
  import sys
  import threading
  import uuid
  import numpy
label_desc: Use image node_id 2 for calling a global function with example usage: random_utf8(nchars) and returns: str