code: def test_run_mlm(self):
      tmp_dir = self.get_auto_remove_tmp_dir()
      testargs = f"""
              run_mlm.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}
              --overwrite_output_dir
              --do_train
              --do_eval
              --prediction_loss_only
              --num_train_epochs=1
          """.split()
  
      if torch_device != "cuda":
          testargs.append("--no_cuda")
  
      with patch.object(sys, "argv", testargs):
          run_mlm.main()
          result = get_results(tmp_dir)
          self.assertLess(result["perplexity"], 42)
  
imports: import argparse
  import json
  import logging
  import os
  import sys
  from unittest.mock import patch
  import torch
  from transformers import ViTMAEForPreTraining, Wav2Vec2ForPreTraining
  from transformers.testing_utils import CaptureLogger, TestCasePlus, get_gpu_count, slow, torch_device
  from transformers.utils import is_apex_available
label_desc: Use image node_id 4 for calling the ExamplesTests obj's underlying member method code with example usage: obj.test_run_mlm() without return types