code: def ckpt_recency(ckpt):
      """Recency as Checkpoint importance metric.
  
      This function can also act as an example of how to make checkpoint
      importance keyfuncs. This is a named function, but as you can see
      it could be easily implemented as a lambda in a pinch.
      """
      return ckpt.meta["unixtime"]
  
imports: import torch
  import collections
  import collections.abc
  import os
  import time
  import yaml
  import pathlib
  import inspect
  import shutil
  import logging
  import warnings
  from packaging import version
  import speechbrain.utils._workarounds
  from speechbrain.utils.distributed import main_process_only, if_main_process, ddp_barrier
label_desc: Use image node_id 9 for calling a global function with example usage: ckpt_recency(ckpt) and returns: ckpt