code: def use_multi_device_mode() -> bool:
      """Return True if environment indicates multi-device mode is enabled."""
      return (
          os.environ.get("DTENSOR_ENABLE_MULTI_DEVICE_EXPANSION", "0")
          != "0"
      )
  
imports: import os
  from typing import List, Optional, Union
  from tensorflow.python.eager import context
  from tensorflow.python.framework import config
  from tensorflow.python.framework import device
  from tensorflow.python.util.tf_export import tf_export
label_desc: Use image node_id 15 for calling a global function with example usage: use_multi_device_mode() and returns: unknown