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"""
# Example of PPO pipeline
Use the pipeline on a single process:
> python3 -u ding/example/ppo.py
Use the pipeline on multiple processes:
We surpose there are N processes (workers) = 1 learner + 1 evaluator + (N-2) collectors
## First Example —— Execute on one machine with multi processes.
Execute 4 processes with 1 learner + 1 evaluator + 2 collectors
Remember to keep them connected by mesh to ensure that they can exchange information with each other.
> ditask --package . --main ding.example.ppo.main --parallel-workers 4 --topology mesh
"""
import gym
from ditk import logging
from ding.model import VAC
from ding.policy import PPOPolicy
from ding.envs import DingEnvWrapper, BaseEnvManagerV2
from ding.data import DequeBuffer
from ding.config import compile_config
from ding.framework import task, ding_init
from ding.framework.context import OnlineRLContext
from ding.framework.middleware import multistep_trainer, StepCollector, interaction_evaluator, CkptSaver, \
gae_estimator, online_logger, ContextExchanger, ModelExchanger
from ding.utils import set_pkg_seed
from dizoo.classic_control.cartpole.config.cartpole_ppo_config import main_config, create_config
def main():
logging.getLogger().setLevel(logging.INFO)
cfg = compile_config(main_config, create_cfg=create_config, auto=True, save_cfg=task.router.node_id == 0)
ding_init(cfg)
with task.start(async_mode=False, ctx=OnlineRLContext()):
collector_env = BaseEnvManagerV2(
env_fn=[lambda: DingEnvWrapper(gym.make("CartPole-v0")) for _ in range(cfg.env.collector_env_num)],
cfg=cfg.env.manager
)
evaluator_env = BaseEnvManagerV2(
env_fn=[lambda: DingEnvWrapper(gym.make("CartPole-v0")) for _ in range(cfg.env.evaluator_env_num)],
cfg=cfg.env.manager
)
set_pkg_seed(cfg.seed, use_cuda=cfg.policy.cuda)
model = VAC(**cfg.policy.model)
policy = PPOPolicy(cfg.policy, model=model)
# Consider the case with multiple processes
if task.router.is_active:
# You can use labels to distinguish between workers with different roles,
# here we use node_id to distinguish.
if task.router.node_id == 0:
task.add_role(task.role.LEARNER)
elif task.router.node_id == 1:
task.add_role(task.role.EVALUATOR)
else:
task.add_role(task.role.COLLECTOR)
# Sync their context and model between each worker.
task.use(ContextExchanger(skip_n_iter=1))
task.use(ModelExchanger(model))
task.use(interaction_evaluator(cfg, policy.eval_mode, evaluator_env))
task.use(StepCollector(cfg, policy.collect_mode, collector_env))
task.use(gae_estimator(cfg, policy.collect_mode))
task.use(multistep_trainer(policy.learn_mode, log_freq=50))
task.use(CkptSaver(policy, cfg.exp_name, train_freq=100))
task.use(online_logger(train_show_freq=3))
task.run()
if __name__ == "__main__":
main()
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