code: def setUp(self):
      super().setUp()
      self.devices = [f"cpu:{i}" for i in range(8)]
      shape = (8,)
      axis_names = ["data"]
  
      self.device_mesh = distribution_lib.DeviceMesh(
          shape, axis_names, self.devices
      )
  
imports: import os
  from unittest import mock
  import numpy
  import pytest
  import tensorflow
  from keras import backend
  from keras import testing
  from keras.backend import distribution_lib
  from keras.distribution import distribution_lib
label_desc: Use image node_id 1 for calling the DataParallelDistributionTest obj's underlying member method code with example usage: obj.setUp() without return types