code: def default_tokenizer(self):
      return LEDTokenizer.from_pretrained("allenai/led-base-16384")
  
imports: import json
  import os
  import unittest
  from transformers import BatchEncoding, LEDTokenizer, LEDTokenizerFast
  from transformers.models.led.tokenization_led import VOCAB_FILES_NAMES
  from transformers.testing_utils import require_tokenizers, require_torch
  from transformers.utils import cached_property
  from ...test_tokenization_common import TokenizerTesterMixin
label_desc: Use image node_id 5 for calling the TestTokenizationLED obj's underlying member method code with example usage: obj.default_tokenizer() and returns: LEDTokenizer