code: def _check_training_error(self):
      assert self.training_error is None
  
file_path: h2o-3/h2o-hadoop-common/tests_fault_tolerance/python/test_grid_auto_recover.py
imports: import sys
  import os
  import time
  from tests import pyunit_utils
  import fault_tolerance_utils
  import h2o
  from h2o.grid.grid_search import H2OGridSearch
  from h2o.estimators.gbm import H2OGradientBoostingEstimator
  from h2o.exceptions import H2OResponseError
  import unittest
  import threading
label_desc: Use image node_id 4 for calling the GridAutoRecoveryTest obj's underlying member method code with example usage: obj._check_training_error() without return types