code: def test_classifier(self):
      testing_utils.train_model(
          {
              "task": "integration_tests:classifier",
              "classes": ["one", "zero"],
              "data_parallel": True,
              "model": "transformer/classifier",
              **MODEL_OPTS,
          }
      )
  
file_path: ParlAI/tests/test_multigpu.py
imports: import unittest
  import parlai.utils.testing
label_desc: Use image node_id 3 for calling the TestDataParallel obj's underlying member method code with example usage: obj.test_classifier() without return types