class_docstr: Subproc executes an abstract main(), returning the stacktrace as a string in join().
code: def __init__(self, *arg: Any, **kwarg: Any):
      self._error_queue = multiprocessing.Queue()  # type: Any
      super().__init__(*arg, **kwarg)
  
imports: import abc
  import itertools
  import multiprocessing
  import sys
  import textwrap
  import time
  import traceback
  from typing import Any, List, Optional, cast
  import pytest
  import determined
  from determined import core, ipc
  from tests import parallel
label_desc: Use image node_id 1 to create a new Subproc object from inherited base classes: multiprocessing with example: obj = Subproc()