class_docstr: Tests for mesh_util that require accelerator initialization.
class_docstr_tok: ["Tests","for","mesh_util","that","require","accelerator","initialization","."]
code: def test_is_initialized(self):
      self.assertTrue(accelerator_util.is_initialized())
  
imports: import os
  from unittest import mock
  from absl.testing import parameterized
  from tensorflow.dtensor.python import accelerator_util
  from tensorflow.dtensor.python import config
  from tensorflow.dtensor.python import mesh_util
  from tensorflow.dtensor.python.tests import test_util
  from tensorflow.python.eager import context
  from tensorflow.python.framework import config
  from tensorflow.python.framework import device
  from tensorflow.python.platform import test
label_desc: Use image node_id 3 for calling the InitializedMeshUtilTest obj's underlying member method code with example usage: obj.test_is_initialized() without return types