algorithms in MPE don't have policy.actor and policy.critic

[h1657]

There are policy.actor and policy.critic in base_runner.py, but I couldn't find them in the algorithms folder of MPE. How can I solve this problem?

def restore(self):
        for agent_id in range(self.num_agents):
            policy_actor_state_dict = torch.load(str(self.model_dir) + '/actor_agent' + str(agent_id) + '.pt')
            self.policy[agent_id].get_actions.load_state_dict(policy_actor_state_dict)
            policy_critic_state_dict = torch.load(str(self.model_dir) + '/critic_agent' + str(agent_id) + '.pt')
            self.policy[agent_id].get_values.load_state_dict(policy_critic_state_dict)
            if self.trainer[agent_id]._use_valuenorm:
                policy_vnrom_state_dict = torch.load(str(self.model_dir) + '/vnrom_agent' + str(agent_id) + '.pt')
                self.trainer[agent_id].value_normalizer.load_state_dict(policy_vnrom_state_dict)