ray/rllib/agents/marwil/tests/test_marwil.py

import os
from pathlib import Path
import unittest

import ray
import ray.rllib.agents.marwil as marwil
from ray.rllib.utils.framework import try_import_tf
from ray.rllib.utils.test_utils import check_compute_single_action, \
    framework_iterator

tf1, tf, tfv = try_import_tf()


class TestMARWIL(unittest.TestCase):
    @classmethod
    def setUpClass(cls):
        ray.init()

    @classmethod
    def tearDownClass(cls):
        ray.shutdown()

    def test_marwil_compilation_and_learning_from_offline_file(self):
        """Test whether a MARWILTrainer can be built with all frameworks.

        And learns from a historic-data file.
        To generate this data, first run:
        $ ./train.py --run=PPO --env=CartPole-v0 \
          --stop='{"timesteps_total": 50000}' \
          --config='{"output": "/tmp/out", "batch_mode": "complete_episodes"}'
        """
        rllib_dir = Path(__file__).parent.parent.parent.parent
        print("rllib dir={}".format(rllib_dir))
        data_file = os.path.join(rllib_dir, "tests/data/cartpole/large.json")
        print("data_file={} exists={}".format(data_file,
                                              os.path.isfile(data_file)))

        config = marwil.DEFAULT_CONFIG.copy()
        config["num_workers"] = 0  # Run locally.
        config["evaluation_num_workers"] = 1
        config["evaluation_interval"] = 1
        # Evaluate on actual environment.
        config["evaluation_config"] = {"input": "sampler"}
        # Learn from offline data.
        config["input"] = [data_file]
        num_iterations = 350
        min_reward = 70.0

        # Test for all frameworks.
        for _ in framework_iterator(config):
            trainer = marwil.MARWILTrainer(config=config, env="CartPole-v0")
            learnt = False
            for i in range(num_iterations):
                eval_results = trainer.train()["evaluation"]
                print("iter={} R={}".format(
                    i, eval_results["episode_reward_mean"]))
                # Learn until some reward is reached on an actual live env.
                if eval_results["episode_reward_mean"] > min_reward:
                    print("learnt!")
                    learnt = True
                    break

            if not learnt:
                raise ValueError(
                    "MARWILTrainer did not reach {} reward from expert "
                    "offline data!".format(min_reward))

            check_compute_single_action(
                trainer, include_prev_action_reward=True)

            trainer.stop()


if __name__ == "__main__":
    import pytest
    import sys
    sys.exit(pytest.main(["-v", __file__]))