146 lines
6.4 KiB
Python
146 lines
6.4 KiB
Python
import time
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import tqdm
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from torch.utils.tensorboard import SummaryWriter
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from typing import Dict, List, Union, Callable, Optional
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from tianshou.data import Collector
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from tianshou.policy import BasePolicy
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from tianshou.utils import tqdm_config, MovAvg
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from tianshou.trainer import test_episode, gather_info
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def onpolicy_trainer(
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policy: BasePolicy,
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train_collector: Collector,
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test_collector: Collector,
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max_epoch: int,
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step_per_epoch: int,
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collect_per_step: int,
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repeat_per_collect: int,
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episode_per_test: Union[int, List[int]],
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batch_size: int,
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train_fn: Optional[Callable[[int], None]] = None,
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test_fn: Optional[Callable[[int], None]] = None,
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stop_fn: Optional[Callable[[float], bool]] = None,
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save_fn: Optional[Callable[[BasePolicy], None]] = None,
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log_fn: Optional[Callable[[dict], None]] = None,
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writer: Optional[SummaryWriter] = None,
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log_interval: int = 1,
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verbose: bool = True,
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**kwargs
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) -> Dict[str, Union[float, str]]:
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"""A wrapper for on-policy trainer procedure.
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:param policy: an instance of the :class:`~tianshou.policy.BasePolicy`
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class.
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:param train_collector: the collector used for training.
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:type train_collector: :class:`~tianshou.data.Collector`
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:param test_collector: the collector used for testing.
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:type test_collector: :class:`~tianshou.data.Collector`
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:param int max_epoch: the maximum of epochs for training. The training
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process might be finished before reaching the ``max_epoch``.
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:param int step_per_epoch: the number of step for updating policy network
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in one epoch.
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:param int collect_per_step: the number of frames the collector would
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collect before the network update. In other words, collect some frames
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and do one policy network update.
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:param int repeat_per_collect: the number of repeat time for policy
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learning, for example, set it to 2 means the policy needs to learn each
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given batch data twice.
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:param episode_per_test: the number of episodes for one policy evaluation.
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:type episode_per_test: int or list of ints
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:param int batch_size: the batch size of sample data, which is going to
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feed in the policy network.
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:param function train_fn: a function receives the current number of epoch
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index and performs some operations at the beginning of training in this
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epoch.
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:param function test_fn: a function receives the current number of epoch
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index and performs some operations at the beginning of testing in this
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epoch.
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:param function save_fn: a function for saving policy when the undiscounted
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average mean reward in evaluation phase gets better.
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:param function stop_fn: a function receives the average undiscounted
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returns of the testing result, return a boolean which indicates whether
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reaching the goal.
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:param function log_fn: a function receives env info for logging.
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:param torch.utils.tensorboard.SummaryWriter writer: a TensorBoard
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SummaryWriter.
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:param int log_interval: the log interval of the writer.
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:param bool verbose: whether to print the information.
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:return: See :func:`~tianshou.trainer.gather_info`.
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"""
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global_step = 0
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best_epoch, best_reward = -1, -1
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stat = {}
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start_time = time.time()
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test_in_train = train_collector.policy == policy
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for epoch in range(1, 1 + max_epoch):
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# train
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policy.train()
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if train_fn:
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train_fn(epoch)
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with tqdm.tqdm(total=step_per_epoch, desc=f'Epoch #{epoch}',
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**tqdm_config) as t:
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while t.n < t.total:
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result = train_collector.collect(n_episode=collect_per_step,
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log_fn=log_fn)
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data = {}
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if test_in_train and stop_fn and stop_fn(result['rew']):
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test_result = test_episode(
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policy, test_collector, test_fn,
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epoch, episode_per_test)
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if stop_fn and stop_fn(test_result['rew']):
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if save_fn:
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save_fn(policy)
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for k in result.keys():
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data[k] = f'{result[k]:.2f}'
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t.set_postfix(**data)
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return gather_info(
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start_time, train_collector, test_collector,
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test_result['rew'])
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else:
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policy.train()
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if train_fn:
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train_fn(epoch)
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losses = policy.learn(
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train_collector.sample(0), batch_size, repeat_per_collect)
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train_collector.reset_buffer()
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step = 1
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for k in losses.keys():
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if isinstance(losses[k], list):
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step = max(step, len(losses[k]))
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global_step += step
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for k in result.keys():
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data[k] = f'{result[k]:.2f}'
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if writer and global_step % log_interval == 0:
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writer.add_scalar(
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k, result[k], global_step=global_step)
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for k in losses.keys():
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if stat.get(k) is None:
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stat[k] = MovAvg()
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stat[k].add(losses[k])
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data[k] = f'{stat[k].get():.6f}'
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if writer and global_step % log_interval == 0:
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writer.add_scalar(
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k, stat[k].get(), global_step=global_step)
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t.update(step)
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t.set_postfix(**data)
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if t.n <= t.total:
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t.update()
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# test
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result = test_episode(
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policy, test_collector, test_fn, epoch, episode_per_test)
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if best_epoch == -1 or best_reward < result['rew']:
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best_reward = result['rew']
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best_epoch = epoch
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if save_fn:
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save_fn(policy)
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if verbose:
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print(f'Epoch #{epoch}: test_reward: {result["rew"]:.6f}, '
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f'best_reward: {best_reward:.6f} in #{best_epoch}')
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if stop_fn and stop_fn(best_reward):
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break
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return gather_info(
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start_time, train_collector, test_collector, best_reward)
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