code: def test_instantiate(self):
      # TODO
      pass
  
file_path: BigDL/python/nano/test/automl/common/test_backend.py
imports: import pytest
  from unittest import TestCase
  from bigdl.nano.automl.hpo.backend import create_hpo_backend
  from bigdl.nano.automl.hpo.backend import SamplerType, PrunerType
label_desc: Use image node_id 3 for calling the TestHPOBackend obj's underlying member method code with example usage: obj.test_instantiate() without return types