code: def setUp(self):
      init_orca_context(runtime="ray", address="localhost:6379")
  
imports: import pytest
  import logging
  from unittest import TestCase
  import ray
  from ray.data import Dataset
  import torch.nn
  import torch.optim
  from bigdl.orca import init_orca_context, stop_orca_context
  from bigdl.orca.learn.pytorch import Estimator
  from bigdl.orca.learn.metrics import MSE
label_desc: Use image node_id 1 for calling the TestPytorchEstimator obj's underlying member method code with example usage: obj.setUp() without return types