code: def test_deduped_split_distributions(self):
      with testing_utils.tempdir() as tmpdir:
          data_path = tmpdir
  
          def _split_type_teacher(
              split_type: str,
          ) -> CMUDocumentGroundedConversationsTeacher:
              kwargs = {
                  "task": "cmu_dog",
                  "datatype": "valid",
                  "cmu_dog_split_type": split_type,
                  "datapath": data_path,
              }
              parser = setup_args()
              parser.set_defaults(**kwargs)
              opt = parser.parse_args([])
              agents = create_task_agent_from_taskname(opt)
              assert isinstance(agents, List)
              task = agents[0]
              assert isinstance(
                  task, CMUDocumentGroundedConversationsTeacher
              )
              return task
  
          og_teacher = _split_type_teacher("deduped")
          sn_teacher = _split_type_teacher("seen")
          self.assertEqual(
              len(og_teacher.rare_word_f1.freq_dist),
              len(sn_teacher.rare_word_f1.freq_dist),
          )
  
file_path: ParlAI/tests/tasks/test_cmu_dog.py
imports: from typing import List
  import unittest
  from parlai.scripts.display_data import setup_args
  from parlai.core.teachers import create_task_agent_from_taskname
  from parlai.tasks.cmu_dog.agents import CMUDocumentGroundedConversationsTeacher
  import parlai.utils.testing
label_desc: Use image node_id 1 for calling the CMUDoGTest obj's underlying member method code with example usage: obj.test_deduped_split_distributions() and returns: task