class_docstr: Strategy that handles communication on a single device.
class_docstr_tok: ["Strategy","that","handles","communication","on","a","single","device","."]
code: def root_device(self) -> torch.device:
      return self._root_device
  
imports: from __future__ import annotations
  from typing import Any
  import torch
  from torch.nn import Module
  from typing_extensions import override
  from lightning.fabric.accelerators import Accelerator
  from lightning.fabric.plugins.io.checkpoint_io import CheckpointIO
  from lightning.fabric.plugins.precision import Precision
  from lightning.fabric.strategies.strategy import Strategy, TBroadcast
  from lightning.fabric.utilities.types import _DEVICE
label_desc: Use image node_id 2 for calling the SingleDeviceStrategy obj's underlying member method code with example usage: obj.root_device() and returns: self