code: def test_dummy_data(self):
      self.fl_server.set_client_num(1)
      self.fl_server.build()
      self.fl_server.start()
      x, y = np.ones([2, 3]), np.ones([2])
      fgboost_regression = FGBoostRegression()
      fgboost_regression.fit(x, y)
      result = fgboost_regression.predict(x)
      result
  
imports: from multiprocessing import Process
  import unittest
  from uuid import uuid4
  import numpy
  import pandas
  import os
  import math
  from bigdl.ppml.fl import *
  from bigdl.ppml.fl.algorithms.fgboost_regression import FGBoostRegression
  from bigdl.ppml.fl.fl_server import FLServer
  from bigdl.ppml.fl.utils import init_fl_context
  from bigdl.ppml.fl.utils import FLTest
label_desc: Use image node_id 4 for calling the TestFGBoostRegression obj's underlying member method code with example usage: obj.test_dummy_data() without return types