code: def tearDown(self):
      shutil.rmtree(self.output_dir)
  
imports: import shutil
  import tempfile
  import unittest
  from unittest.mock import patch
  from transformers import DefaultFlowCallback, IntervalStrategy, PrinterCallback, ProgressCallback, Trainer, TrainerCallback, TrainingArguments, is_torch_available
  from transformers.testing_utils import require_torch
label_desc: Use image node_id 2 for calling the TrainerCallbackTest obj's underlying member method code with example usage: obj.tearDown() without return types