code: def test_unknown_std_parameterization(self):
      with pytest.raises(NotImplementedError):
          _ = GaussianCNNModel(
              input_dim=self.input_dim,
              filters=(((3, 3), 3), ((3, 3), 6)),
              strides=[1, 1],
              padding="SAME",
              hidden_sizes=(1,),
              output_dim=1,
              std_parameterization="unknown",
          )
  
imports: import pickle
  from unittest import mock
  import numpy
  import pytest
  import tensorflow
  from garage.tf.models import GaussianCNNModel
  from tests.fixtures import TfGraphTestCase
label_desc: Use image node_id 16 for calling the TestGaussianCNNModel obj's underlying member method code with example usage: obj.test_unknown_std_parameterization() without return types