code: def _get_context_method():
      vinfo = sys.version_info
  
      # get_context() is only supported in 3.5 and later (same for
      # set_start_method)
      get_context_unsupported = vinfo[0] == 2 or (
          vinfo[0] == 3 and vinfo[1] <= 3
      )
  
      method = None
      # Fix random hanging code in NixOS by switching to spawn method,
      # see issue #414
      # TODO This is only a workaround and doesn't really fix the underlying
      #      issue. The cause of the underlying issue is currently unknown.
      #      Its possible that #535 fixes the issue, though earlier tests
      #      indicated that the cause was something else.
      # TODO this might break the semaphore used to prevent out of memory
      #      errors
      if "NixOS" in platform.version():
          method = "spawn"
          if get_context_unsupported:
              ia.warn(
                  "Detected usage of imgaug.multicore in python <=3.4 "
                  "and NixOS. This is known to sometimes cause endlessly "
                  "hanging programs when also making use of multicore "
                  "augmentation (aka background augmentation). Use "
                  "python 3.5 or later to prevent this."
              )
      elif platform.system() == "Darwin" and vinfo[0:2] == (3, 7):
          # On Mac with python 3.7 there seems to be a problem with matplotlib,
          # resulting in the error "libc++abi.dylib: terminating with uncaught
          # exception of type std::runtime_error: Couldn't close file".
          # The error seems to be due to opened files that get closed in
          # child processes and can be prevented by switching to spawn mode.
          # See https://github.com/matplotlib/matplotlib/issues/15410
          # and https://bugs.python.org/issue33725.
          # It is possible that this problem also affects other python versions,
          # but here it only appeared (consistently) in the 3.7 tests and the
          # reports also seem to be focused around 3.7, suggesting explicitly
          # to update to 3.8.2.
          method = "spawn"
  
      if get_context_unsupported:
          return False
      return method
  
imports: from __future__ import print_function, division, absolute_import
  import sys
  import multiprocessing
  import threading
  import traceback
  import time
  import random
  import platform
  import numpy
  import cv2
  import imgaug.imgaug
  import imgaug.random
  from imgaug.augmentables.batches import Batch, UnnormalizedBatch
label_desc: Use image node_id 1 for calling a global function with example usage: _get_context_method() and returns: method, False