code: def create(replay_buffer, discount_factor: typing.Optional[float]=None, normalize_returns: bool=False,
             forward_steps: int=1, action_noise: typing.Optional[ModelFactory]=None):
      
      return TransitionReplayEnvRollerFactory(
          replay_buffer_factory=replay_buffer,
          discount_factor=discount_factor,
          forward_steps=forward_steps,
          normalize_returns=normalize_returns,
          action_noise=action_noise
      )
docs: Vel factory function