code: def get_dpr_tokenizer(self) -> DPRQuestionEncoderTokenizer:
      return DPRQuestionEncoderTokenizer.from_pretrained(
          os.path.join(self.tmpdirname, "dpr_tokenizer")
      )
  
imports: import json
  import os
  import shutil
  import tempfile
  from unittest import TestCase
  from transformers import BartTokenizer, BartTokenizerFast, DPRQuestionEncoderTokenizer, DPRQuestionEncoderTokenizerFast
  from transformers.models.bart.configuration_bart import BartConfig
  from transformers.models.bert.tokenization_bert import VOCAB_FILES_NAMES
  from transformers.models.dpr.configuration_dpr import DPRConfig
  from transformers.models.roberta.tokenization_roberta import VOCAB_FILES_NAMES
  from transformers.testing_utils import require_faiss, require_tokenizers, require_torch, slow
  from transformers.utils import is_datasets_available, is_faiss_available, is_torch_available
label_desc: Use image node_id 2 for calling the RagTokenizerTest obj's underlying member method code with example usage: obj.get_dpr_tokenizer() and returns: DPRQuestionEncoderTokenizer