code: def spawn(
      fn,
      args=(),
      nprocs=1,
      join=True,
      daemon=False,
      start_method="spawn",
  ):
      r"""Spawns ``nprocs`` processes that run ``fn`` with ``args``.
  
      If one of the processes exits with a non-zero exit status, the
      remaining processes are killed and an exception is raised with the
      cause of termination. In the case an exception was caught in the
      child process, it is forwarded and its traceback is included in
      the exception raised in the parent process.
  
      Args:
          fn (function): Function is called as the entrypoint of the
              spawned process. This function must be defined at the top
              level of a module so it can be pickled and spawned. This
              is a requirement imposed by multiprocessing.
  
              The function is called as ``fn(i, *args)``, where ``i`` is
              the process index and ``args`` is the passed through tuple
              of arguments.
  
          args (tuple): Arguments passed to ``fn``.
          nprocs (int): Number of processes to spawn.
          join (bool): Perform a blocking join on all processes.
          daemon (bool): The spawned processes' daemon flag. If set to True,
                         daemonic processes will be created.
          start_method (str): (deprecated) this method will always use ``spawn``
                                 as the start method. To use a different start method
                                 use ``start_processes()``.
  
      Returns:
          None if ``join`` is ``True``,
          :class:`~ProcessContext` if ``join`` is ``False``
  
      """
      if start_method != "spawn":
          msg = (
              "This method only supports start_method=spawn (got: %s).\n"
              "To use a different start_method use:\n\t\t"
              " torch.multiprocessing.start_processes(...)"
              % start_method
          )
          warnings.warn(msg)
      return start_processes(
          fn, args, nprocs, join, daemon, start_method="spawn"
      )
  
imports: import logging
  import multiprocessing
  import multiprocessing.connection
  import os
  import pickle
  import signal
  import sys
  import tempfile
  import time
  import warnings
  from typing import Optional
  from .None import _prctl_pr_set_pdeathsig
label_desc: Use image node_id 3 for calling a global function with example usage: spawn(fn, args, nprocs, join, daemon, start_method) and returns: start_processes