code: def _register_external_accelerators_and_strategies() -> None:
      """Registers all known strategies in other packages."""
      if _LIGHTNING_COLOSSALAI_AVAILABLE:
          from lightning_colossalai import ColossalAIStrategy
  
          # TODO: Prevent registering multiple times
          if "colossalai" not in StrategyRegistry:
              ColossalAIStrategy.register_strategies(StrategyRegistry)
  
      if _LIGHTNING_BAGUA_AVAILABLE:
          from lightning_bagua import BaguaStrategy
  
          # TODO: Prevent registering multiple times
          if "bagua" not in StrategyRegistry:
              BaguaStrategy.register_strategies(StrategyRegistry)
  
      if _habana_available_and_importable():
          from lightning_habana import (
              HPUAccelerator,
              HPUParallelStrategy,
              SingleHPUStrategy,
          )
  
          # TODO: Prevent registering multiple times
          if "hpu" not in AcceleratorRegistry:
              HPUAccelerator.register_accelerators(AcceleratorRegistry)
          if "hpu_parallel" not in StrategyRegistry:
              HPUParallelStrategy.register_strategies(StrategyRegistry)
          if "hpu_single" not in StrategyRegistry:
              SingleHPUStrategy.register_strategies(StrategyRegistry)
  
      if _graphcore_available_and_importable():
          from lightning_graphcore import IPUAccelerator, IPUStrategy
  
          # TODO: Prevent registering multiple times
          if "ipu" not in AcceleratorRegistry:
              IPUAccelerator.register_accelerators(AcceleratorRegistry)
          if "ipu_strategy" not in StrategyRegistry:
              IPUStrategy.register_strategies(StrategyRegistry)
  
imports: import logging
  import os
  from collections import Counter
  from typing import Dict, List, Literal, Optional, Union
  import torch
  from lightning.fabric.connector import _PRECISION_INPUT, _PRECISION_INPUT_STR, _convert_precision_to_unified_args
  from lightning.fabric.plugins.environments import ClusterEnvironment, LightningEnvironment, LSFEnvironment, MPIEnvironment, SLURMEnvironment, TorchElasticEnvironment
  from lightning.fabric.utilities.device_parser import _determine_root_gpu_device
  from lightning.fabric.utilities.imports import _IS_INTERACTIVE
  from lightning.pytorch.accelerators import AcceleratorRegistry
  from lightning.pytorch.accelerators.accelerator import Accelerator
  from lightning.pytorch.accelerators.cuda import CUDAAccelerator
  from lightning.pytorch.accelerators.mps import MPSAccelerator
  from lightning.pytorch.accelerators.xla import XLAAccelerator
  from lightning.pytorch.plugins import _PLUGIN_INPUT, CheckpointIO, DeepSpeedPrecision, DoublePrecision, FSDPPrecision, HalfPrecision, MixedPrecision, Precision, TransformerEnginePrecision, XLAPrecision
  from lightning.pytorch.plugins.layer_sync import LayerSync, TorchSyncBatchNorm
  from lightning.pytorch.strategies import DDPStrategy, DeepSpeedStrategy, FSDPStrategy, ParallelStrategy, SingleDeviceStrategy, SingleDeviceXLAStrategy, Strategy, StrategyRegistry, XLAStrategy
  from lightning.pytorch.strategies.ddp import _DDP_FORK_ALIASES
  from lightning.pytorch.utilities.exceptions import MisconfigurationException
  from lightning.pytorch.utilities.imports import _LIGHTNING_BAGUA_AVAILABLE, _LIGHTNING_COLOSSALAI_AVAILABLE, _graphcore_available_and_importable, _habana_available_and_importable
  from lightning.pytorch.utilities.rank_zero import rank_zero_info, rank_zero_warn
label_desc: Use image node_id 2 for calling a global function with example usage: _register_external_accelerators_and_strategies() without return types