code: def large_int_format(x):
      num = round_downer(x)
      if 1000000000 <= num:
          return str(num // 1000000000) + "b"
      elif 1000000 <= num < 1000000000:
          return str(num // 1000000) + "mm"
      elif 1000 <= num < 1000000:
          return str(num // 1000) + "k"
      else:
          return str(num)
  
label_desc: Use image node_id 1 for calling a global function with example usage: large_int_format(x) and returns: unknown, unknown, unknown, str