code: def check_parity(self, base_file, test_file, r_tol):
      base_loss = grep_loss_from_file(base_file)
      test_loss = grep_loss_from_file(test_file)
  
      print(
          "baseline loss: {0}, test loss: {1}".format(
              base_loss, test_loss
          )
      )
  
      if base_loss == 0.0 or test_loss == 0.0:
          return False
  
      if abs((base_loss - test_loss) / base_loss) > r_tol:
          return False
  
      return True
  
imports: import unittest
  import os
  import re
  from .test_common import BaseTestCase
label_desc: Use image node_id 26 for calling the GPT2FuncTestCase obj's underlying member method code with example usage: obj.check_parity(base_file, test_file, r_tol) and returns: True, False, False