code: def torch_snapshot(
      savefun=torch.save, filename="snapshot.ep.{.updater.epoch}"
  ):
      """Extension to take snapshot of the trainer for pytorch.
  
      Returns:
          An extension function.
  
      """
      from chainer.training import extension
  
      @extension.make_extension(trigger=(1, "epoch"), priority=-100)
      def torch_snapshot(trainer):
          _torch_snapshot_object(
              trainer, trainer, filename.format(trainer), savefun
          )
  
      return torch_snapshot
  
imports: import argparse
  import copy
  import json
  import logging
  import os
  import shutil
  import tempfile
  import numpy
  import torch
label_desc: Use image node_id 7 for calling a global function with example usage: torch_snapshot(savefun, filename) and returns: torch_snapshot