class_docstr: All the below results were obtained with the original checkpoints and code
  base from https://github.com/allenai/longformer.
  IMPORTANT: Note that the original checkpoints include a `postion_embeddings` "hack"
  and have to be cut to have the correct shape.
  See: https://github.com/huggingface/transformers/pull/9278#issue-544709661.
code: def default_tokenizer(self):
      return LEDTokenizer.from_pretrained("allenai/led-base-16384")
  
imports: import copy
  import tempfile
  import unittest
  from transformers import LEDConfig, is_torch_available
  from transformers.models.auto import get_values
  from transformers.testing_utils import require_sentencepiece, require_tokenizers, require_torch, slow, torch_device
  from transformers.utils import cached_property
  from ...generation.test_generation_utils import GenerationTesterMixin
  from ...test_configuration_common import ConfigTester
  from ...test_modeling_common import ModelTesterMixin, ids_tensor
label_desc: Use image node_id 1 for calling the LEDModelIntegrationTests obj's underlying member method code with example usage: obj.default_tokenizer() and returns: LEDTokenizer