code: def save_vars(vs, filepath):
      """
      Saves variables to the given filepath in a safe manner.
      """
      if os.path.exists(filepath):
          shutil.copyfile(filepath, "{}.old".format(filepath))
      torch.save(vs, filepath)
  
imports: import math
  import os
  import shutil
  import sys
  import time
  import torch
  import torch.distributions
  import torch.nn.functional
  from datasets import CUBImageFt
label_desc: Use image node_id 1 for calling a global function with example usage: save_vars(vs, filepath) without return types