code: def teardown_method(self) -> None:
      # Remove set environment variables
      for key in [
          "RANK",
          "LOCAL_RANK",
          "WORLD_SIZE",
          "MASTER_ADDR",
          "MASTER_PORT",
      ]:
          del os.environ[key]
  
imports: import copy
  import json
  import os
  import pathlib
  from typing import Any, Dict, Iterator, Optional
  import pytest
  import torch
  from deepspeed.runtime import config_utils
  import determined
  import determined.pytorch.deepspeed
  from determined import workload
  from tests.experiment import utils
  from tests.experiment.fixtures import deepspeed_linear_model
label_desc: Use image node_id 2 for calling the TestDeepSpeedTrial obj's underlying member method code with example usage: obj.teardown_method() without return types