class_docstr: Multi step advantage actor critic.
      
docstr: Perform rollout of current policy on distributed structured env and log the time it took.
docstr_tok: ["Perform","rollout","of","current","policy","on","distributed","structured","env","and","log","the","time","it","took","."]
code: def _rollout(self) -> StructuredSpacesRecord:
      """Perform rollout of current policy on distributed structured env and log the time it took."""
      raise NotImplementedError
  
imports: import time
  from collections import defaultdict
  from typing import Optional
  import torch
  from maze.core.agent.torch_actor_critic import TorchActorCritic
  from maze.core.annotations import override
  from maze.core.trajectory_recording.records.structured_spaces_record import StructuredSpacesRecord
  from maze.perception.perception_utils import map_nested_structure
  from maze.train.parallelization.distributed_actors.distributed_actors import DistributedActors
  from maze.train.trainers.common.actor_critic.actor_critic_trainer import ActorCritic
  from maze.train.trainers.common.evaluators.rollout_evaluator import RolloutEvaluator
  from maze.train.trainers.common.model_selection.best_model_selection import BestModelSelection
  from maze.train.trainers.common.trainer import Trainer
  from maze.train.trainers.impala import impala_vtrace
  from maze.train.trainers.impala.impala_algorithm_config import ImpalaAlgorithmConfig
  from maze.train.trainers.impala.impala_events import ImpalaEvents
label_desc: Use image node_id 3 for calling the IMPALA obj's underlying member method code with example usage: obj._rollout() without return types