code: def get_device_locations(
      mesh: layout_lib.Mesh, client_id: Optional[int] = None
  ) -> List[Dict[str, int]]:
      """Returns the device locations of all TPU cores local to the given client.
  
      A device location is a dictionary from dimension names to indices on those
      dimensions. For example, for a 2x2 mesh ('x', 'y'), this function returns a
      permutation of this list:
  
        [{'x': 0, 'y': 0},
         {'x': 0, 'y': 1},
         {'x': 1, 'y': 0},
         {'x': 1, 'y': 1}].
  
      Note that device IDs and device locations are equivalent. The former is a
      linearization of the latter along mesh dimensions.
  
      Args:
        mesh: A TPU mesh.
        client_id: Optional; A DTensor client ID. If empty, query this client.
      """
  
      if mesh.device_type() != _TPU_DEVICE_TYPE:
          raise ValueError("The mesh must be a TPU mesh")
  
      if client_id is None or client_id == config.client_id():
          return mesh.local_device_locations()
  
      # It's not clear we should ever allow a client to query other clients for
      # their device locations.
      raise NotImplementedError(
          "Looking up other clients' device locations is not supported"
      )
  
imports: import functools
  import time
  from typing import List, Optional, Dict
  import numpy
  from tensorflow.dtensor.python import config
  from tensorflow.dtensor.python import dtensor_device
  from tensorflow.dtensor.python import gen_dtensor_ops
  from tensorflow.dtensor.python import layout
  from tensorflow.python.eager import context
  from tensorflow.python.eager import def_function
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import errors
  from tensorflow.python.framework import ops
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import math_ops
  from tensorflow.python.platform import tf_logging
  from tensorflow.python.tpu import topology
  from tensorflow.python.util.tf_export import tf_export
label_desc: Use image node_id 12 for calling a global function with example usage: get_device_locations(mesh, client_id) and returns: mesh