class_docstr: This defines an abstract base class for joinable classes.
  
  A joinable class
  (inheriting from :class:`Joinable`) should implement :meth:`join_hook`,
  which returns a :class:`JoinHook` instance, in addition to
  :meth:`join_device` and :meth:`join_process_group` that return device and
  process group information, respectively.
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docstr: Return a :class:`JoinHook` instance for the given :class:`Joinable`.
  
  Arguments:
      kwargs (dict): a :class:`dict` containing any keyword arguments
          to modify the behavior of the join hook at run time; all
          :class:`Joinable` instances sharing the same join context
          manager are forwarded the same value for ``kwargs``.
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code: def join_hook(self, **kwargs) -> JoinHook:
      r"""
      Return a :class:`JoinHook` instance for the given :class:`Joinable`.
  
      Arguments:
          kwargs (dict): a :class:`dict` containing any keyword arguments
              to modify the behavior of the join hook at run time; all
              :class:`Joinable` instances sharing the same join context
              manager are forwarded the same value for ``kwargs``.
      """
      ...
  
imports: import warnings
  from abc import ABC, abstractmethod
  from types import TracebackType
  from typing import Any, List, NamedTuple, Optional, Type
  import torch
  import torch.distributed
label_desc: Use image node_id 2 for calling the Joinable obj's underlying member method code with example usage: obj.join_hook() without return types