old_contents: # Copyright 2018 DeepMind Technologies Limited. All rights reserved.
  #
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  #     http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  """Example running PPO on continuous control tasks."""
  
  from absl import flags
  from acme.agents.jax import ppo
  import helpers
  from absl import app
  from acme.jax import experiments
  from acme.utils import lp_utils
  import launchpad as lp
  
  FLAGS = flags.FLAGS
  
  flags.DEFINE_bool(
      'run_distributed', False, 'Should an agent be executed in a '
      'distributed way (the default is a single-threaded agent)')
  flags.DEFINE_string('env_name', 'gym:HalfCheetah-v2', 'What environment to run')
  flags.DEFINE_integer('seed', 0, 'Random seed.')
  flags.DEFINE_integer('num_steps', 1_000_000, 'Number of env steps to run.')
  flags.DEFINE_integer('eval_every', 50_000, 'How often to run evaluation.')
  flags.DEFINE_integer('evaluation_episodes', 10, 'Evaluation episodes.')
  
  
  def build_experiment_config():
    """Builds PPO experiment config which can be executed in different ways."""
    # Create an environment, grab the spec, and use it to create networks.
    suite, task = FLAGS.env_name.split(':', 1)
  
    config = ppo.PPOConfig(
        entropy_cost=0,
        learning_rate=1e-4,
        obs_normalization_fns_factory=ppo.build_ema_mean_std_normalizer)
    ppo_builder = ppo.PPOBuilder(config)
  
    layer_sizes = (256, 256, 256)
    return experiments.ExperimentConfig(
        builder=ppo_builder,
        environment_factory=lambda seed: helpers.make_environment(suite, task),
        network_factory=lambda spec: ppo.make_networks(spec, layer_sizes),
        seed=FLAGS.seed,
        max_num_actor_steps=FLAGS.num_steps)
  
  
  def main(_):
    config = build_experiment_config()
    if FLAGS.run_distributed:
      program = experiments.make_distributed_experiment(
          experiment=config, num_actors=4)
      lp.launch(program, xm_resources=lp_utils.make_xm_docker_resources(program))
    else:
      experiments.run_experiment(
          experiment=config,
          eval_every=FLAGS.eval_every,
          num_eval_episodes=FLAGS.evaluation_episodes)
  
  
  if __name__ == '__main__':
    app.run(main)
  
new_contents: # Copyright 2018 DeepMind Technologies Limited. All rights reserved.
  #
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  #     http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  """Example running PPO on continuous control tasks."""
  
  from absl import flags
  from acme.agents.jax import ppo
  import helpers
  from absl import app
  from acme.jax import experiments
  from acme.utils import lp_utils
  import launchpad as lp
  
  FLAGS = flags.FLAGS
  
  flags.DEFINE_bool(
      'run_distributed', False, 'Should an agent be executed in a '
      'distributed way (the default is a single-threaded agent)')
  flags.DEFINE_string('env_name', 'gym:HalfCheetah-v2', 'What environment to run')
  flags.DEFINE_integer('seed', 0, 'Random seed.')
  flags.DEFINE_integer('num_steps', 1_000_000, 'Number of env steps to run.')
  flags.DEFINE_integer('eval_every', 50_000, 'How often to run evaluation.')
  flags.DEFINE_integer('evaluation_episodes', 10, 'Evaluation episodes.')
  flags.DEFINE_integer('num_distributed_actors', 64,
                       'Number of actors to use in the distributed setting.')
  
  
  def build_experiment_config():
    """Builds PPO experiment config which can be executed in different ways."""
    # Create an environment, grab the spec, and use it to create networks.
    suite, task = FLAGS.env_name.split(':', 1)
  
    config = ppo.PPOConfig(
        normalize_advantage=True,
        normalize_value=True,
        obs_normalization_fns_factory=ppo.build_mean_std_normalizer)
    ppo_builder = ppo.PPOBuilder(config)
  
    layer_sizes = (256, 256, 256)
    return experiments.ExperimentConfig(
        builder=ppo_builder,
        environment_factory=lambda seed: helpers.make_environment(suite, task),
        network_factory=lambda spec: ppo.make_networks(spec, layer_sizes),
        seed=FLAGS.seed,
        max_num_actor_steps=FLAGS.num_steps)
  
  
  def main(_):
    config = build_experiment_config()
    if FLAGS.run_distributed:
      program = experiments.make_distributed_experiment(
          experiment=config, num_actors=FLAGS.num_distributed_actors)
      lp.launch(program, xm_resources=lp_utils.make_xm_docker_resources(program))
    else:
      experiments.run_experiment(
          experiment=config,
          eval_every=FLAGS.eval_every,
          num_eval_episodes=FLAGS.evaluation_episodes)
  
  
  if __name__ == '__main__':
    app.run(main)
  
subject: Update PPO baselines run script.