tf_agents/agents/sac/sac_agent.py [454:472]:
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      def update():
        """Update target network."""
        critic_update_1 = common.soft_variables_update(
            self._critic_network_1.variables,
            self._target_critic_network_1.variables,
            tau,
            tau_non_trainable=1.0)

        critic_2_update_vars = common.deduped_network_variables(
            self._critic_network_2, self._critic_network_1)

        target_critic_2_update_vars = common.deduped_network_variables(
            self._target_critic_network_2, self._target_critic_network_1)

        critic_update_2 = common.soft_variables_update(
            critic_2_update_vars,
            target_critic_2_update_vars,
            tau,
            tau_non_trainable=1.0)
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tf_agents/agents/td3/td3_agent.py [248:264]:
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      def update():  # pylint: disable=missing-docstring
        critic_update_1 = common.soft_variables_update(
            self._critic_network_1.variables,
            self._target_critic_network_1.variables,
            tau,
            tau_non_trainable=1.0)

        critic_2_update_vars = common.deduped_network_variables(
            self._critic_network_2, self._critic_network_1)
        target_critic_2_update_vars = common.deduped_network_variables(
            self._target_critic_network_2, self._target_critic_network_1)

        critic_update_2 = common.soft_variables_update(
            critic_2_update_vars,
            target_critic_2_update_vars,
            tau,
            tau_non_trainable=1.0)
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