code: def setUp(self) -> None:
      self.fl_server = FLServer(1)
      self.fl_server.set_port(self.port)
      self.fl_server.build()
      self.fl_server.start()
  
imports: from multiprocessing import Process
  from typing import List
  import unittest
  import numpy
  import pandas
  import os
  from bigdl.ppml.fl import *
  from bigdl.ppml.fl.nn.fl_server import FLServer
  from bigdl.ppml.fl.nn.fl_client import FLClient
  from bigdl.ppml.fl.nn.pytorch.utils import set_one_like_parameter
  from bigdl.ppml.fl.nn.fl_context import init_fl_context
  from bigdl.ppml.fl.estimator import Estimator
  from torch import Tensor, nn
  import torch
  from torch.utils.data import DataLoader
  from torchvision import datasets
  from torchvision.transforms import ToTensor
  from bigdl.ppml.fl.utils import FLTest
label_desc: Use image node_id 1 for calling the TestMnist obj's underlying member method code with example usage: obj.setUp() without return types