docstr: Test dynamic batching with chunk teachers end to end.
code: def test_chunky(self):
      """
      Test dynamic batching with chunk teachers end to end.
      """
      self._test_correct_processed(
          NUM_TEST,
          model="test_agents/unigram",  # important we use a real model here
          task="integration_tests:chunky",
          datatype="train:stream",
          num_epochs=2,  # important we use num epochs > 1
      )
  
imports: from parlai.core.opt import Opt
  from parlai.tasks.integration_tests.agents import NUM_TEST, EXAMPLE_SIZE
  from parlai.utils.conversations import Conversations
  import parlai.utils.testing
  import os
  from typing import Dict, Any
  import unittest
label_desc: Use image node_id 14 for calling the TestDynamicBatching obj's underlying member method code with example usage: obj.test_chunky() without return types