code: def test_symbol(self):
      config = create_config(log_interval=2, seed=42)
      estimator = Estimator.from_mxnet(
          config=config,
          model_creator=get_model,
          validation_metrics_creator=get_metrics,
          eval_metrics_creator=get_metrics,
      )
      estimator.fit(
          get_train_data_iter,
          validation_data=get_test_data_iter,
          epochs=2,
          batch_size=16,
      )
      estimator.shutdown()
  
file_path: analytics-zoo/pyzoo/test/zoo/orca/learn/ray/mxnet/test_mxnet_symbol.py
imports: from unittest import TestCase
  import numpy
  import pytest
  import mxnet
  from zoo.orca.learn.mxnet import Estimator, create_config
label_desc: Use image node_id 1 for calling the TestMXNetSymbol obj's underlying member method code with example usage: obj.test_symbol() without return types