message: Do not configure collective ops with MirroredStrategy
  It's not needed for single host training. We are no longer using the scoped
  allocator optimization.
  Fix
diff: @@ -371,14 +371,6 @@ class MirroredExtended(distribute_lib.StrategyExtendedV1):
  self._initialize_multi_worker(devices)
  def _make_collective_ops(self, devices):
  - if ops.executing_eagerly_outside_functions():
  - try:
  - context.context().configure_collective_ops(
  - scoped_allocator_enabled_ops=("CollectiveReduce",))
  - except RuntimeError:
  - logging.warning("Collective ops is not configured at program startup."
  - " Some performance features may not be enabled.")
  -
  self._collective_keys = cross_device_utils.CollectiveKeys(
  group_key_start=1 + self._collective_key_base) # pylint: disable=protected-access
  return cross_device_ops_lib.CollectiveAllReduce(
  