class_docstr: Plugin for training with XLA.
  
  Args:
      precision: Full precision (32-true) or half precision (16-true, bf16-true).
  
  Raises:
      ValueError:
          If unsupported ``precision`` is provided.
code: def teardown(self) -> None:
      os.environ.pop("XLA_USE_BF16", None)
      os.environ.pop("XLA_USE_F16", None)
  
file_path: pytorch-lightning/src/lightning/fabric/plugins/precision/xla.py
imports: import os
  from typing import Any, Literal
  import torch
  from typing_extensions import get_args, override
  from lightning.fabric.accelerators.xla import _XLA_AVAILABLE
  from lightning.fabric.plugins.precision.precision import Precision
  from lightning.fabric.utilities.types import Optimizable
label_desc: Use image node_id 3 for calling the XLAPrecision obj's underlying member method code with example usage: obj.teardown() without return types