def custom_training_workflow(workers: WorkerSet, config: dict):
local_replay_buffer = LocalReplayBuffer(num_shards=1,
learning_starts=1000,
buffer_size=50000,
replay_batch_size=64)
def add_ppo_metrics(batch):
print("PPO policy learning on samples from",
batch.policy_batches.keys(), "env steps", batch.env_steps(),
"agent steps", batch.env_steps())
metrics = _get_shared_metrics()
metrics.counters["agent_steps_trained_PPO"] += batch.env_steps()
return batch
def add_dqn_metrics(batch):
print("DQN policy learning on samples from",
batch.policy_batches.keys(), "env steps", batch.env_steps(),
"agent steps", batch.env_steps())
metrics = _get_shared_metrics()
metrics.counters["agent_steps_trained_DQN"] += batch.env_steps()
return batch
# Generate common experiences.
rollouts = ParallelRollouts(workers, mode="bulk_sync")
r1, r2 = rollouts.duplicate(n=2)
# DQN sub-flow.
dqn_store_op = r1.for_each(SelectExperiences(["dqn_policy"])) \
.for_each(
StoreToReplayBuffer(local_buffer=local_replay_buffer))
dqn_replay_op = Replay(local_buffer=local_replay_buffer) \
.for_each(add_dqn_metrics) \
.for_each(TrainOneStep(workers, policies=["dqn_policy"])) \
.for_each(UpdateTargetNetwork(
workers, target_update_freq=500, policies=["dqn_policy"]))
dqn_train_op = Concurrently([dqn_store_op, dqn_replay_op],
mode="round_robin",
output_indexes=[1])
# PPO sub-flow.
ppo_train_op = r2.for_each(SelectExperiences(["ppo_policy"])) \
.combine(ConcatBatches(
min_batch_size=200, count_steps_by="env_steps")) \
.for_each(add_ppo_metrics) \
.for_each(StandardizeFields(["advantages"])) \
.for_each(TrainOneStep(
workers,
policies=["ppo_policy"],
num_sgd_iter=10,
sgd_minibatch_size=128))
# Combined training flow
train_op = Concurrently([ppo_train_op, dqn_train_op],
mode="async",
output_indexes=[1])
return StandardMetricsReporting(train_op, workers, config)
def custom_training_workflow_ppo_ddpg(workers: WorkerSet, config: dict):
local_replay_buffer = LocalReplayBuffer(num_shards=1,
learning_starts=1000,
buffer_size=50000,
replay_batch_size=64)
def add_ppo_metrics(batch):
print("PPO policy learning on samples from",
batch.policy_batches.keys(), "env steps", batch.env_steps(),
"agent steps", batch.env_steps())
metrics = _get_shared_metrics()
metrics.counters["agent_steps_trained_PPO"] += batch.env_steps()
return batch
def add_ddpg_metrics(batch):
print("DDPG policy learning on samples from",
batch.policy_batches.keys(), "env steps", batch.env_steps(),
"agent steps", batch.env_steps())
metrics = _get_shared_metrics()
metrics.counters["agent_steps_trained_DDPG"] += batch.env_steps()
return batch
# Generate common experiences.
rollouts = ParallelRollouts(workers, mode="bulk_sync")
r1, r2 = rollouts.duplicate(n=2)
# PPO sub-flow.
ppo_train_op = r2.for_each(SelectExperiences(["PPO_policy"])) \
.combine(ConcatBatches(
min_batch_size=200)) \
.for_each(add_ppo_metrics) \
.for_each(StandardizeFields(["advantages"])) \
.for_each(TrainOneStep(
workers,
policies=["PPO_policy"],
num_sgd_iter=10,
sgd_minibatch_size=128))
# DDPG sub-flow.
ddpg_train_op = r2.for_each(SelectExperiences(["DDPG_policy"])) \
.combine(ConcatBatches(
min_batch_size=200)) \
.for_each(add_ddpg_metrics) \
.for_each(StandardizeFields(["advantages"])) \
.for_each(TrainOneStep(
workers,
policies=["DDPG_policy"],
num_sgd_iter=10,
sgd_minibatch_size=128))
# , count_steps_by="env_steps")) \
# Combined training flow
train_op = Concurrently([ppo_train_op, ddpg_train_op],
mode="async",
output_indexes=[1])
return StandardMetricsReporting(train_op, workers, config)
# if __name__ == "__main__":
# args = parser.parse_args()
# assert not (args.torch and args.mixed_torch_tf),\
# "Use either --torch or --mixed-torch-tf, not both!"
# ray.init()
# # Simple environment with 4 independent cartpole entities
# register_env("multi_agent_cartpole",
# lambda _: MultiAgentCartPole({"num_agents": 4}))
# single_env = gym.make("CartPole-v0")
# obs_space = single_env.observation_space
# act_space = single_env.action_space
# # Note that since the trainer below does not include a default policy or
# # policy configs, we have to explicitly set it in the multiagent config:
# policies = {
# "ppo_policy": (PPOTorchPolicy if args.torch or args.mixed_torch_tf else
# PPOTFPolicy, obs_space, act_space, PPO_CONFIG),
# "dqn_policy": (DQNTorchPolicy if args.torch else DQNTFPolicy,
# obs_space, act_space, DQN_CONFIG),
# }
# def policy_mapping_fn(agent_id):
# if agent_id % 2 == 0:
# return "ppo_policy"
# else:
# return "dqn_policy"
# MyTrainer = build_trainer(
# name="PPO_DQN_MultiAgent",
# default_policy=None,
# execution_plan=custom_training_workflow)
# config = {
# "rollout_fragment_length": 50,
# "num_workers": 0,
# "env": "multi_agent_cartpole",
# "multiagent": {
# "policies": policies,
# "policy_mapping_fn": policy_mapping_fn,
# "policies_to_train": ["dqn_policy", "ppo_policy"],
# },
# # Use GPUs iff `RLLIB_NUM_GPUS` env var set to > 0.
# "num_gpus": int(os.environ.get("RLLIB_NUM_GPUS", "0")),
# "framework": "torch" if args.torch else "tf",
# "_use_trajectory_view_api": True,
# }
# stop = {
# "training_iteration": args.stop_iters,
# "timesteps_total": args.stop_timesteps,
# "episode_reward_mean": args.stop_reward,
# }
# results = tune.run(MyTrainer, config=config, stop=stop)
# if args.as_test:
# check_learning_achieved(results, args.stop_reward)
# ray.shutdown()