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.
      """
      self.sc.stop()
  
file_path: BigDL/python/orca/test/bigdl/orca/torch/test_torch_estimator.py
imports: import torch
  from torch import nn
  import pytest
  from unittest import TestCase
  from bigdl.orca.torch import TorchModel, TorchLoss
  from bigdl.dllib.nncontext import *
  from torch.utils.data import TensorDataset, DataLoader
  from bigdl.dllib.estimator import *
  from bigdl.dllib.keras.optimizers import Adam
  from bigdl.dllib.optim.optimizer import MaxEpoch, EveryEpoch
  from bigdl.dllib.keras.metrics import Accuracy
  from bigdl.dllib.feature.common import FeatureSet
label_desc: Use image node_id 2 for calling the TestPytorch obj's underlying member method code with example usage: obj.tearDown() without return types