class_docstr: Unit and integration tests to check that the behavior of DINO is correct
  under FSDP.
class_docstr_tok: ["Unit","and","integration","tests","to","check","that","the","behavior","of","DINO","is","correct","under","FSDP","."]
docstr: Check that the FSDP SwAV head reacts identically as the DDP one
docstr_tok: ["Check","that","the","FSDP","SwAV","head","reacts","identically","as","the","DDP","one"]
code: def test_dino_head(self) -> None:
      """
      Check that the FSDP SwAV head reacts identically as the DDP one
      """
      with in_temporary_directory():
          with with_temp_files(count=1) as sync_file:
              world_size = 2
              mp.spawn(
                  self._dino_head_worker,
                  (sync_file, world_size),
                  nprocs=world_size,
              )
  
imports: import os
  import unittest
  import torch
  import torch.multiprocessing
  import torch.optim
  from torch.nn.parallel import DistributedDataParallel
  from vissl.models import build_model
  from vissl.models.heads.dino_head import DINOHead, DINOHeadFSDP
  from vissl.utils.checkpoint import CheckpointFormatConverter, DINOCheckpointUtils
  from vissl.utils.fsdp_utils import fsdp_wrapper
  from vissl.utils.hydra_config import compose_hydra_configuration, convert_to_attrdict
  from vissl.utils.misc import set_torch_seed
  from vissl.utils.test_utils import gpu_test, in_temporary_directory, init_distributed_on_file, run_integration_test, with_temp_files
label_desc: Use image node_id 6 for calling the TestDINO obj's underlying member method code with example usage: obj.test_dino_head() without return types