CLOVER 解决了自动驾驶规划中训练与评估不匹配的核心痛点，做端到端规划的研究者和工程师可以直接参考其生成器-评分器框架和闭环自蒸馏方法，有望提升实际部署中的规划鲁棒性。
端到端自动驾驶规划器通常通过模仿单一记录轨迹来训练，但评估时却使用基于规则的规划指标（如安全性、可行性、进度和舒适度），导致训练与评估不匹配。CLOVER 提出了一种闭环价值估计与排序框架，采用轻量级生成器-评分器结构：生成器产生多样候选轨迹，评分器预测规划指标子分数进行排序。通过构建评估器过滤的伪专家轨迹和集合级覆盖监督，CLOVER 扩展了候选支持；并采用保守闭环自蒸馏优化生成器和评分器。在NAVSIM上，CLOVER 达到94.5 PDMS和90.4 EPDMS，创下新SOTA；在更具挑战的NavHard上获得48.3 EPDMS，匹配最强结果。
CLOVER: Closed-Loop Value Estimation \& Ranking for End-to-End Autonomous Driving Planning
End-to-end autonomous driving planners are commonly trained by imitating a single logged trajectory, yet evaluated by rule-based planning metrics that measure safety, feasibility, progress, and comfort. This creates a training--evaluation mismatch: trajectories close to the logged path may violate planning rules, while alternatives farther from the demonstration can remain valid and high-scoring. The mismatch is especially limiting for proposal-selection planners, whose performance depends on candidate-set coverage and scorer ranking quality. We propose CLOVER, a Closed-LOop Value Estimation and Ranking framework for end-to-end autonomous driving planning. CLOVER follows a lightweight generator--scorer formulation: a generator produces diverse candidate trajectories, and a scorer predicts planning-metric sub-scores to rank them at inference time. To expand proposal support beyond single-trajectory imitation, CLOVER constructs evaluator-filtered pseudo-expert trajectories and trains the generator with set-level coverage supervision. It then performs conservative closed-loop self-distillation: the scorer is fitted to true evaluator sub-scores on generated proposals, while the generator is refined toward teacher-selected top-$k$ and vector-Pareto targets with stability regularization. We analyze when an imperfect scorer can improve the generator, showing that scorer-mediated refinement is reliable when scorer-selected targets are enriched under the true evaluator and updates remain conservative. On NAVSIM, CLOVER achieves 94.5 PDMS and 90.4 EPDMS, establishing a new state of the art. On the more challenging NavHard split, it obtains 48.3 EPDMS, matching the strongest reported result. On supplementary nuScenes open-loop evaluation, CLOVER achieves the lowest L2 error and collision rate among compared methods. Code data will be released at https://github.com/WilliamXuanYu/CLOVER.