code: def has_loss_data(self, file_name):
      has_loss = False
      if os.path.exists(file_name):
          loss = grep_loss_from_file(file_name)
          if loss != 0.0:
              has_loss = True
  
      return has_loss
  
imports: import unittest
  import os
  import re
  from .test_common import BaseTestCase
label_desc: Use image node_id 25 for calling the GPT2FuncTestCase obj's underlying member method code with example usage: obj.has_loss_data(file_name) and returns: has_loss