code: def is_pl_trainer_checkpoint(checkpoint):
      return "pytorch-lightning_version" in checkpoint
  
file_path: mmf/mmf/utils/checkpoint_updater.py
imports: import logging
  from typing import Any, Dict, Tuple
  import torch
  from mmf.common.registry import registry
label_desc: Use image node_id 2 for calling a global function with example usage: is_pl_trainer_checkpoint(checkpoint) and returns: unknown