code: def testCqlLoss(self, cql_alpha, num_cql_samples, expected_loss):
      agent = cql_sac_agent.CqlSacAgent(
          self._time_step_spec,
          self._action_spec,
          critic_network=DummyCriticNet(),
          actor_network=None,
          actor_optimizer=None,
          critic_optimizer=None,
          alpha_optimizer=None,
          cql_alpha=cql_alpha,
          num_cql_samples=num_cql_samples,
          include_critic_entropy_term=False,
          use_lagrange_cql_alpha=False,
          random_seed=self._random_seed,
          actor_policy_ctor=DummyActorPolicy,
      )
  
      observations = tf.constant([[1, 2], [3, 4]], dtype=tf.float32)
      time_steps = ts.restart(observations, batch_size=2)
      actions = tf.constant([[5], [6]], dtype=tf.float32)
  
      loss = (
          agent._cql_loss(time_steps, actions, training=False)
          * agent._get_cql_alpha()
      )
  
      self.initialize_v1_variables()
      loss_ = self.evaluate(loss)
  
      self.assertAllClose(loss_, expected_loss)
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from absl.testing import parameterized
  import tensorflow
  import tensorflow_probability
  from tf_agents.agents.cql import cql_sac_agent
  from tf_agents.agents.ddpg import critic_network
  from tf_agents.agents.ddpg import critic_rnn_network
  from tf_agents.agents.sac import tanh_normal_projection_network
  from tf_agents.networks import actor_distribution_network
  from tf_agents.networks import actor_distribution_rnn_network
  from tf_agents.networks import network
  from tf_agents.networks import utils
  from tf_agents.specs import distribution_spec
  from tf_agents.specs import tensor_spec
  from tf_agents.trajectories import policy_step
  from tf_agents.trajectories import time_step
  from tf_agents.trajectories import trajectory
  from tf_agents.utils import common
  from tf_agents.utils import nest_utils
  from tf_agents.utils import test_utils
label_desc: Use image node_id 2 for calling the CqlSacAgentTest obj's underlying member method code with example usage: obj.testCqlLoss(cql_alpha, num_cql_samples, expected_loss) without return types