code: def get_timestamp():
      return datetime.now().strftime("%y%m%d-%H%M%S")
  
imports: import math
  import os
  import random
  from datetime import datetime
  import cv2
  import numpy
  import torch
  from torchvision.utils import make_grid
label_desc: Use image node_id 2 for calling a global function with example usage: get_timestamp() and returns: datetime