code: def setUp(self):
      self.model_tester = FlaxGPTJModelTester(self)
  
imports: import tempfile
  import unittest
  import numpy
  import transformers
  from transformers import GPT2Tokenizer, GPTJConfig, is_flax_available, is_torch_available
  from transformers.testing_utils import is_pt_flax_cross_test, require_flax, tooslow
  from ...generation.test_flax_utils import FlaxGenerationTesterMixin
  from ...test_modeling_flax_common import FlaxModelTesterMixin, ids_tensor, random_attention_mask
label_desc: Use image node_id 1 for calling the FlaxGPTJModelTest obj's underlying member method code with example usage: obj.setUp() without return types