class_docstr: Here we also overwrite some of the tests of test_modeling_common.py, as Bit does not use input_ids, inputs_embeds,
  attention_mask and seq_length.
code: def setUp(self):
      self.model_tester = BitModelTester(self)
      self.config_tester = ConfigTester(
          self, config_class=BitConfig, has_text_modality=False
      )
  
imports: import unittest
  from transformers import BitConfig
  from transformers.testing_utils import require_torch, require_vision, slow, torch_device
  from transformers.utils import cached_property, is_torch_available, is_vision_available
  from ...test_backbone_common import BackboneTesterMixin
  from ...test_configuration_common import ConfigTester
  from ...test_modeling_common import ModelTesterMixin, floats_tensor, ids_tensor
  from ...test_pipeline_mixin import PipelineTesterMixin
label_desc: Use image node_id 1 for calling the BitModelTest obj's underlying member method code with example usage: obj.setUp() without return types