code: def setUp(self):
      self.model_tester = BigBirdModelTester(self)
      self.config_tester = ConfigTester(
          self, config_class=BigBirdConfig, hidden_size=37
      )
  
imports: import unittest
  from transformers import BigBirdConfig, is_torch_available
  from transformers.models.auto import get_values
  from transformers.models.big_bird.tokenization_big_bird import BigBirdTokenizer
  from transformers.testing_utils import require_torch, slow, torch_device
  from ...test_configuration_common import ConfigTester
  from ...test_modeling_common import ModelTesterMixin, floats_tensor, ids_tensor, random_attention_mask
  from ...test_pipeline_mixin import PipelineTesterMixin
label_desc: Use image node_id 2 for calling the BigBirdModelTest obj's underlying member method code with example usage: obj.setUp() without return types