class_docstr: The Connector parses several Fabric arguments and instantiates the Strategy including its owned components.
  
      A. accelerator flag could be:
          1. accelerator class
          2. accelerator str
          3. accelerator auto
  
      B. strategy flag could be:
          1. strategy class
          2. strategy str registered with STRATEGY_REGISTRY
          3. strategy str in _strategy_type enum which listed in each strategy as
             backend (registed these too, and _strategy_type could be deprecated)
  
      C. plugins flag could be:
          1. precision class (should be removed, and precision flag should allow user pass classes)
          2. checkpoint_io class
          3. cluster_environment class
  
  priorities which to take when:
      A. Class > str
      B. Strategy > Accelerator/precision/plugins
docstr: Choose the accelerator type (str) based on availability when ``accelerator='auto'``.
docstr_tok: ["Choose","the","accelerator","type","(","str",")","based","on","availability","when","``","accelerator='auto","'","``","."]
code: def _choose_auto_accelerator(self) -> str:
      """Choose the accelerator type (str) based on availability when ``accelerator='auto'``."""
      if XLAAccelerator.is_available():
          return "tpu"
      if MPSAccelerator.is_available():
          return "mps"
      if CUDAAccelerator.is_available():
          return "cuda"
      return "cpu"
  
imports: import os
  from collections import Counter
  from typing import Any, Dict, List, Optional, Union, cast
  import torch
  from typing_extensions import get_args
  from lightning.fabric.accelerators import ACCELERATOR_REGISTRY
  from lightning.fabric.accelerators.accelerator import Accelerator
  from lightning.fabric.accelerators.cuda import CUDAAccelerator
  from lightning.fabric.accelerators.mps import MPSAccelerator
  from lightning.fabric.accelerators.xla import XLAAccelerator
  from lightning.fabric.plugins import CheckpointIO, DeepSpeedPrecision, HalfPrecision, MixedPrecision, Precision, TransformerEnginePrecision, XLAPrecision
  from lightning.fabric.plugins.environments import ClusterEnvironment, LightningEnvironment, LSFEnvironment, MPIEnvironment, SLURMEnvironment, TorchElasticEnvironment
  from lightning.fabric.plugins.precision.double import DoublePrecision
  from lightning.fabric.plugins.precision.fsdp import FSDPPrecision
  from lightning.fabric.plugins.precision.precision import _PRECISION_INPUT, _PRECISION_INPUT_INT, _PRECISION_INPUT_STR, _PRECISION_INPUT_STR_ALIAS, _PRECISION_INPUT_STR_ALIAS_CONVERSION
  from lightning.fabric.strategies import STRATEGY_REGISTRY, DeepSpeedStrategy, ParallelStrategy, SingleDeviceStrategy, SingleDeviceXLAStrategy, Strategy, XLAFSDPStrategy, XLAStrategy
  from lightning.fabric.strategies.ddp import _DDP_FORK_ALIASES
  from lightning.fabric.strategies.fsdp import _FSDP_ALIASES, FSDPStrategy
  from lightning.fabric.utilities import rank_zero_info, rank_zero_warn
  from lightning.fabric.utilities.device_parser import _determine_root_gpu_device
  from lightning.fabric.utilities.imports import _IS_INTERACTIVE
label_desc: Use image node_id 4 for calling the _Connector obj's underlying member method code with example usage: obj._choose_auto_accelerator() and returns: str, str, str, str