code: def setUp(self):
      self.model_tester = FlaxBigBirdModelTester(self)
  
imports: import unittest
  from transformers import BigBirdConfig, is_flax_available
  from transformers.testing_utils import require_flax, slow
  from ...test_modeling_flax_common import FlaxModelTesterMixin, ids_tensor, random_attention_mask
label_desc: Use image node_id 1 for calling the FlaxBigBirdModelTest obj's underlying member method code with example usage: obj.setUp() without return types