code: def get_tokenizer(self, **kwargs) -> PegasusTokenizer:
      return PegasusTokenizer.from_pretrained(self.tmpdirname, **kwargs)
  
imports: import unittest
  from transformers import PegasusTokenizer, PegasusTokenizerFast
  from transformers.testing_utils import get_tests_dir, require_sentencepiece, require_tokenizers, require_torch, slow
  from transformers.utils import cached_property
  from ...test_tokenization_common import TokenizerTesterMixin
label_desc: Use image node_id 3 for calling the BigBirdPegasusTokenizationTest obj's underlying member method code with example usage: obj.get_tokenizer() and returns: PegasusTokenizer