text: """
  Various ways to gather trajectories in RL environments.
  """
  
  from .list import mean_total_reward, mean_finished_reward
  from .logger import EpisodeLogger
  from .norm import RewardNormalizer
  from .players import Player, BasicPlayer, NStepPlayer, BatchedPlayer
  from .replay import ReplayBuffer, UniformReplayBuffer, PrioritizedReplayBuffer
  from .rollers import Roller, BasicRoller, TruncatedRoller, EpisodeRoller
  from .rollout import Rollout, empty_rollout
  
  __all__ = dir()
  