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      <description>当前 VLM 驾驶方案要么直接输出规划缺失 CoT 推理，要么将感知-预测-规划割裂为独立模块缺乏协同。AutoDrive-P³ 提出统一链式思维框架，通过 P³-CoT 数据集构建感知→预测→规划的结构化推理链，再用 P³-GRPO 算法进行分层渐进式强化微调——将奖励从规划反传到感知和预测模块，实现三模块联合优化。在 NAVSIM 上达到 89.9 EPDMS，nuScenes 上取得最低碰撞率。</description>
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