code: def test_slow_bs3(self):
      self._run(batchsize=3)
  
imports: from unittest import TestCase
  import os
  import parlai.utils.testing
  from parlai.tasks.integration_tests.agents import NUM_TEST
  import parlai.scripts.multiprocessing_train
label_desc: Use image node_id 1 for calling the TestSlowChunk obj's underlying member method code with example usage: obj.test_slow_bs3() without return types