class_docstr: Joinable Evaluator.
class_docstr_tok: ["Joinable","Evaluator","."]
docstr: Return our fake join hook.
code: def join_hook(self, **kwargs) -> JoinHook:
      """
      Return our fake join hook.
      """
      return EvaluatorJoinHook(self)
  
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 3 for calling the JoinableEvaluator obj's underlying member method code with example usage: obj.join_hook() and returns: EvaluatorJoinHook