def get_player_memories(self, ids=None):
"""
summarizes the memories (states, actions, rewards, ...) of selected players
:param ids: the ids of the player memories
:type ids: list
:return: the combined memories of the selected players
:rtype: memory
"""
memory = Memory()
if ids == None:
ids = range(4)
for i in ids:
memory.append_memory(self.players[i].memory)
return memory
def main():
print("Cuda available: "+str(torch.cuda.is_available()))
#start tensorboard
tb = program.TensorBoard()
tb.configure(argv=[None, '--logdir', Settings.runs_folder])
tb.launch()
# set seed for debugging
if Settings.random_seed:
torch.manual_seed(Settings.random_seed)
#loading initial policy
policy = Settings.model().to(Settings.device)
# take the newest generation available
i_episode = max_gen = 0
generations = [int(f[:8]) for f in listdir(Settings.checkpoint_folder) if f.endswith(".pt")]
if len(generations) > 0:
max_gen = max(generations)
policy.load_state_dict(torch.load(Settings.checkpoint_folder+"/" + str(max_gen).zfill(8) + ".pt"))
i_episode = max_gen
#create ppo
ppo = PPO(policy, [Settings.lr, Settings.lr_stepsize, Settings.lr_gamma], Settings.betas, Settings.gamma, Settings.K_epochs, Settings.eps_clip, Settings.batch_size,Settings.mini_batch_size, c1=Settings.c1, c2=Settings.c2, start_episode=max_gen-1 )
#create four players
players = [RlPlayer(ppo.policy_old), RlPlayer(ppo.policy_old), RlPlayer(ppo.policy_old), RlPlayer(ppo.policy_old)]
#create a game simulation
schafkopf_env = SchafkopfEnv(Settings.random_seed)
game_statistics = GameStatistics()
# training loop
for _ in range(0, 90000000):
Settings.logger.info("playing " +str(Settings.update_games)+ " games")
# play a bunch of games
t0 = time.time()
for _ in range(Settings.update_games):
state, reward, terminal = schafkopf_env.reset()
while not terminal:
action, prob = players[state["game_state"].current_player].act(state)
state, reward, terminal = schafkopf_env.step(action, prob)
for p in range(4):
players[p].retrieve_reward(reward[p])
i_episode += 1
game_statistics.update_statistics(state["game_state"], reward)
t1 = time.time()
#update the policy
Settings.logger.info("updating policy")
player_memories = Memory()
for p in players:
player_memories.append_memory(p.memory)
ppo.update(player_memories, i_episode)
t2 = time.time()
ppo.lr_scheduler.step(i_episode)
# writing game statistics for tensorboard
Settings.logger.info("Episode: "+str(i_episode) + " game simulation (s) = "+str(t1-t0) + " update (s) = "+str(t2-t1))
schafkopf_env.print_game()
game_statistics.write_and_reset (i_episode)
# reset memories and replace policy
players = [RlPlayer(ppo.policy_old), RlPlayer(ppo.policy_old), RlPlayer(ppo.policy_old), RlPlayer(ppo.policy_old)]
# save and evaluate the policy
Settings.logger.info("Saving Checkpoint")
torch.save(ppo.policy_old.state_dict(), Settings.checkpoint_folder + "/" + str(i_episode).zfill(8) + ".pt")
Settings.logger.info("Evaluation")
play_against_other_players(Settings.checkpoint_folder, Settings.model, [RandomPlayer, RandomCowardPlayer, RuleBasedPlayer], Settings.eval_games,
Settings.summary_writer)
