code: def test_generator_distributed(self):
      valid, test = self._distributed_train_model()
  
      self.assertLessEqual(valid["ppl"], 1.60)
      self.assertLessEqual(test["ppl"], 1.60)
  
      # Tests that DialogData.get() is doing the right thing
      # Ensure no duplication of examples among workers
      self.assertEqual(valid["exs"].value(), BATCHSIZE)
      self.assertEqual(test["exs"].value(), BATCHSIZE)
  
imports: import os
  import unittest
  import parlai.utils.testing
  import parlai.scripts.build_dict
  import parlai.scripts.multiprocessing_train
  import parlai.tasks.integration_tests.agents
label_desc: Use image node_id 1 for calling the TestDistributed obj's underlying member method code with example usage: obj.test_generator_distributed() without return types