code: def test_create_experiment_config(self):
      exp_config = tfrbert_task_experiments.tfrbert_exp()
      self.assertIsInstance(exp_config, cfg.ExperimentConfig)
  
imports: import tensorflow
  from official.core import config_definitions
  from tensorflow_ranking.examples.keras import tfrbert_task_experiments
label_desc: Use image node_id 1 for calling the TfrbertTaskExperimentsTest obj's underlying member method code with example usage: obj.test_create_experiment_config() without return types