code: def testTrainableVariables(self):
      output_spec = tensor_spec.BoundedTensorSpec([2], tf.int32, 0, 1)
      network = (
          categorical_projection_network.CategoricalProjectionNetwork(
              output_spec
          )
      )
  
      inputs = _get_inputs(batch_size=3, num_input_dims=5)
  
      network(inputs, outer_rank=1)
      self.evaluate(tf.compat.v1.global_variables_initializer())
  
      # Dense kernel, dense bias.
      self.assertEqual(2, len(network.trainable_variables))
      self.assertEqual((5, 4), network.trainable_variables[0].shape)
      self.assertEqual((4,), network.trainable_variables[1].shape)
  
file_path: agents/tf_agents/networks/categorical_projection_network_test.py
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import tensorflow
  import tensorflow_probability
  from tf_agents.networks import categorical_projection_network
  from tf_agents.specs import tensor_spec
label_desc: Use image node_id 2 for calling the CategoricalProjectionNetworkTest obj's underlying member method code with example usage: obj.testTrainableVariables() without return types