code: def test_config(self):
      rmse_obj = metrics.RootMeanSquaredError(
          name="rmse", dtype="int32"
      )
      self.assertEqual(rmse_obj.name, "rmse")
      self.assertEqual(rmse_obj._dtype, "int32")
  
      rmse_obj2 = metrics.RootMeanSquaredError.from_config(
          rmse_obj.get_config()
      )
      self.assertEqual(rmse_obj2.name, "rmse")
      self.assertEqual(rmse_obj2._dtype, "int32")
  
imports: import numpy
  from absl.testing import parameterized
  from keras import testing
  from keras.metrics import regression_metrics
label_desc: Use image node_id 1 for calling the RootMeanSquaredErrorTest obj's underlying member method code with example usage: obj.test_config() without return types