code: def test_tf2_import(self):
      from bigdl.orca.learn.tf2 import (
          Estimator,
          pyspark_estimator,
          spark_runner,
      )
  
file_path: BigDL/python/orca/test/bigdl/orca/test_import.py
imports: from unittest import TestCase
  import pytest
  from bigdl.orca import init_orca_context, stop_orca_context
label_desc: Use image node_id 4 for calling the TestImport obj's underlying member method code with example usage: obj.test_tf2_import() without return types