code: def test_run_mlm_no_trainer(self):
      tmp_dir = self.get_auto_remove_tmp_dir()
      testargs = f"""
              {self.examples_dir}/pytorch/language-modeling/run_mlm_no_trainer.py
              --model_name_or_path distilroberta-base
              --train_file ./tests/fixtures/sample_text.txt
              --validation_file ./tests/fixtures/sample_text.txt
              --output_dir {tmp_dir}
              --num_train_epochs=1
              --checkpointing_steps epoch
              --with_tracking
          """.split()
  
      run_command(self._launch_args + testargs)
      result = get_results(tmp_dir)
      self.assertLess(result["perplexity"], 42)
      self.assertTrue(os.path.exists(os.path.join(tmp_dir, "epoch_0")))
      self.assertTrue(
          os.path.exists(os.path.join(tmp_dir, "mlm_no_trainer"))
      )
  
imports: import argparse
  import json
  import logging
  import os
  import shutil
  import sys
  import tempfile
  import unittest
  from unittest import mock
  from accelerate.utils import write_basic_config
  from transformers.testing_utils import TestCasePlus, backend_device_count, run_command, slow, torch_device
label_desc: Use image node_id 5 for calling the ExamplesTestsNoTrainer obj's underlying member method code with example usage: obj.test_run_mlm_no_trainer() without return types