code: def should_use_fsdp(opt):
      return (
          FSDP_AVAILABLE
          and is_distributed()
          and opt.get("ddp_backend", DEFAULT_DDP_BACKEND)
          in ("zero2", "zero3")
      )
  
imports: import contextlib
  import functools
  import torch
  import torch.distributed
  from torch.distributed.algorithms.join import Join, Joinable, JoinHook
  import torch.nn
  from parlai.scripts.eval_model import Evaluator
  from parlai.scripts.train_model import TrainLoop
  from parlai.utils.distributed import is_distributed, get_dist_group
label_desc: Use image node_id 2 for calling a global function with example usage: should_use_fsdp(opt) and returns: unknown