code: def main(enable_v2_behavior=True, config_logical_devices=True):
      """All-in-one main function for tf.distribute tests."""
      if config_logical_devices:
          app.call_after_init(_set_logical_devices)
      if enable_v2_behavior:
          v2_compat.enable_v2_behavior()
      else:
          v2_compat.disable_v2_behavior()
      multi_process_runner.test_main()
  
imports: import collections
  import dataclasses
  import functools
  import io
  import itertools
  import threading
  from absl import app
  from tensorflow.python.compat import v2_compat
  from tensorflow.python.distribute import collective_all_reduce_strategy
  from tensorflow.python.distribute import multi_process_runner
  from tensorflow.python.distribute import multi_worker_test_base
  from tensorflow.python.distribute import tpu_strategy
  from tensorflow.python.distribute import values
  from tensorflow.python.eager import context
  from tensorflow.python.framework import config
  from tensorflow.python.framework import ops
  from tensorflow.python.framework import tensor
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import array_ops_stack
  from tensorflow.python.util import nest
label_desc: Use image node_id 6 for calling a global function with example usage: main(enable_v2_behavior, config_logical_devices) without return types