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DIVER强化扩散打破端到端自动驾驶中的模仿学习瓶颈

  • 2026-02-06 01:18:09
DIVER强化扩散打破端到端自动驾驶中的模仿学习瓶颈

本篇论文出发点:

现有的端到端自动驾驶方法,主要以来单一专家轨迹进行模型学习,这往往导致驾驶行为保守且同质化,难以泛化到复杂的真实世界中。因此本文提出DIVER方案,讲基于扩散范式的轨迹预测与强化学习结合,以生成多样且安全的轨迹。

本文主要贡献:

提出Policy-Aware Diffusion Generator(PADG)模块,该模块将地图元素与交通参与者交互作为条件输入,是生成的多模态轨迹能够刻画不同的驾驶风格
提出一种新的多样新评测指标,用于评估多模态轨迹生成效果,相较于现有指标提供了一种更具原则性的评估方式
DIVER 显著提升了轨迹多样性,有效解决了模仿学习中固有的模式坍塌问题。

知识点介绍:

多模态轨迹:
τ={(xt(m),yt(m))∣t=1,…,Tf;m=1,…,M}.M表示模态数量,通常为6个,最终轨迹从这些候选中通过评分函数进行选择,而候选轨迹之间的多样性(例如转弯、超车、跟车等)则用于推断自车可能采取的驾驶策略
扩散模型的模态坍缩问题:在单一GT监督下训练的基于扩散的E2E-AD方法,尽管具有生成能力,但仍然继承了传统模仿学习的模式坍塌问题

本文方法介绍:

本文提出的方法叫Policy-Aware Diffusion Generator,强调"策略生成",这与我们常用的轨迹生成稍有不同。比如diffusiondrive,用的是条件概率建模,训练的目标是模仿专家轨迹。PADG把扩散的过程视为随机策略,每一次去噪采样等价于一次policy sampling,多模态轨迹等价与policy中的action samples。下面我们具体看细节
如上图DIVER 由两个主要组件组成:感知模块和运动规划模块。该系统以原始感知特征作为输入,并输出未来轨迹的分布,左边这部分我们再熟悉不过了,不赘述了,主要看中间部分PADG。
输入:GT轨迹和预测轨迹,预测轨迹来自前面模型输出(推测是已经训好的sparsedrive模型输出的轨迹)
模型训练部分:对轨迹进行加噪,DDPM方式加噪然后使用模型(Condition Diffusion Decoder)进行去噪,模型(Condition Diffusion Decoder)将环境信息当做条件学习噪声预测,对噪声轨迹进行去噪,得到去噪后的真值轨迹和预测轨迹,通过二分匹配,进行轨迹refine。需要补充的是,GT轨迹在去噪后还会增加Reference GT轨迹进行监督,目的是为了提升模型的探索能力,不至于模态坍缩。下图为Condition Diffusion Decoder具体结构
参考GT轨迹的生成:
“we sample reference GT trajectories from the empirical distribution of expert behaviors”,本文的构造方法是从相似场景/相似状态条件下从数据集中采样不同驾驶意图的专家轨迹。
强化学习部分:环境状态s->Diffusion Policy πθ(去噪网络)->采样多条轨迹->计算轨迹reward->构造GRPO advantage->对πθ进行参数更新;推测:去噪时间步内每一步可以认为是一次状态转移,可以使用该强化训练。
奖励函数部分:
多样性奖励(Diversity Reward):通过最大化轨迹间距离来促进轨迹多样性,鼓励扩散模型探索更广泛的可行行为,而非坍塌到冗余模式
安全奖励(Safety Reward):用于惩罚与静态或动态障碍物间距过小的预测路径。
轨迹一致性奖励 (Trajectory Consistency Reward):鼓励当前规划的轨迹与上一时刻的轨迹保持平滑过渡,避免车辆出现不稳定的抖动。
车道保持奖励 (Lane Keeping Reward):用于惩罚频繁或不必要的变道行为
loss部分:

总结:

好的:评测的时候增加了轨迹多样性指标,这种之前论文很少有关注这块,下面两个公式主要做多样性评测,第一个公式,看模态和模态见的距离,距离越大值越大,但不同场景尺度可能不同如高速和路口,所以通过第二个人公式进行尺度归一化,这样保证不同速度/场景下是可比较的。
不好的
  • 最关键的部分,参考GT轨迹怎么构造的讲的不够细致,不透明;
  • 强化学习是本篇论文的亮点,但文中只提了将diffusion model 视作 stochastic policy,用GRPO进行轨迹RL,没有深入讨论diffusion timestep 与 policy step 的对应关系,以及GRPO是否会破坏diffusion生成的稳定性?理论解释有些薄弱,有点强行加GRPO的嫌疑
  • 工程方面:文章描述的有些绕,系统看起来也比较复杂,实际落地很难

《DIVER: Reinforced Diffusion Breaks Imitation Bottlenecks in End-to-End Autonomous Driving》

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  1. CONNECT:[ UseTime:0.000394s ] mysql:host=127.0.0.1;port=3306;dbname=e_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000607s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.001513s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000343s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000534s ]
  6. SELECT * FROM `set` [ RunTime:0.000245s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000573s ]
  8. SELECT * FROM `article` WHERE `id` = 465879 LIMIT 1 [ RunTime:0.004598s ]
  9. UPDATE `article` SET `lasttime` = 1770840270 WHERE `id` = 465879 [ RunTime:0.019152s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.004438s ]
  11. SELECT * FROM `article` WHERE `id` < 465879 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.003845s ]
  12. SELECT * FROM `article` WHERE `id` > 465879 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.023950s ]
  13. SELECT * FROM `article` WHERE `id` < 465879 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.026880s ]
  14. SELECT * FROM `article` WHERE `id` < 465879 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.025337s ]
  15. SELECT * FROM `article` WHERE `id` < 465879 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.063612s ]
0.247696s