code: def timestamp(fmt="%y%m%d_%H-%M-%S"):
      return datetime.now().strftime(fmt)
  
imports: import hashlib
  import operator
  import sys
  from collections import Counter
  from collections import OrderedDict
  from datetime import datetime
  from numbers import Number
  import numpy
  import torch
label_desc: Use image node_id 3 for calling a global function with example usage: timestamp(fmt) and returns: datetime