docstr: teardown any state that was previously setup with a setup_method
  call.
docstr_tok: ["teardown","any","state","that","was","previously","setup","with","a","setup_method","call","."]
code: def tearDown(self):
      """teardown any state that was previously setup with a setup_method
      call.
      """
      stop_orca_context()
  
imports: from unittest import TestCase
  import os
  import pytest
  import numpy
  from pyspark.sql.types import ArrayType, DoubleType
  from bigdl.orca import init_orca_context, stop_orca_context
  from bigdl.orca.data import SparkXShards
  from bigdl.orca.data.image.utils import chunks
  from bigdl.orca.learn.utils import convert_predict_rdd_to_dataframe, _dataframe_to_xshards, convert_predict_xshards_to_dataframe, convert_predict_rdd_to_xshard, update_predict_xshards
label_desc: Use image node_id 2 for calling the TestUtil obj's underlying member method code with example usage: obj.tearDown() without return types