mirror of
https://github.com/vale981/ray
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53 lines
1.6 KiB
Python
53 lines
1.6 KiB
Python
"""Example of a custom training workflow. Run this for a demo.
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This example shows:
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- using Tune trainable functions to implement custom training workflows
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You can visualize experiment results in ~/ray_results using TensorBoard.
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"""
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import argparse
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import os
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import ray
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from ray import tune
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from ray.rllib.agents.ppo import PPOTrainer
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parser = argparse.ArgumentParser()
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parser.add_argument("--torch", action="store_true")
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def my_train_fn(config, reporter):
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# Train for 100 iterations with high LR
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agent1 = PPOTrainer(env="CartPole-v0", config=config)
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for _ in range(10):
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result = agent1.train()
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result["phase"] = 1
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reporter(**result)
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phase1_time = result["timesteps_total"]
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state = agent1.save()
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agent1.stop()
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# Train for 100 iterations with low LR
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config["lr"] = 0.0001
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agent2 = PPOTrainer(env="CartPole-v0", config=config)
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agent2.restore(state)
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for _ in range(10):
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result = agent2.train()
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result["phase"] = 2
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result["timesteps_total"] += phase1_time # keep time moving forward
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reporter(**result)
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agent2.stop()
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if __name__ == "__main__":
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ray.init()
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args = parser.parse_args()
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config = {
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"lr": 0.01,
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# Use GPUs iff `RLLIB_NUM_GPUS` env var set to > 0.
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"num_gpus": int(os.environ.get("RLLIB_NUM_GPUS", "0")),
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"num_workers": 0,
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"framework": "torch" if args.torch else "tf",
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}
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resources = PPOTrainer.default_resource_request(config).to_json()
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tune.run(my_train_fn, resources_per_trial=resources, config=config)
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