code: def _save_obj(self, key, time_stamp, obj):
      cache_path = self.get_cache_path(key)
      os.makedirs(cache_path, exist_ok=True)
      save_path = os.path.join(cache_path, str(time_stamp))
      torch.save(obj, save_path)
      return save_path
  
imports: import os
  import time
  import torch
  import traceback
  from contextlib import contextmanager
  import jiant.utils.python.io
  import jiant.utils.python.filesystem
label_desc: Use image node_id 5 for calling the ZLogger obj's underlying member method code with example usage: obj._save_obj(key, time_stamp, obj) and returns: save_path