code: def tic(message=None, print_string=True):
      """
      Start counting time.
      :param message: additional message to print;
      :param print_string: whether to print the string to stdout;
      """
      TIME_STACK.append(time.time())
      if message:
          log(str(message), print_string=print_string)
  
imports: import os
  import time
  from pprint import pformat
label_desc: Use image node_id 3 for calling a global function with example usage: tic(message, print_string) without return types