arXivDaily arXiv每日学术速递 周一至周五更新
​通知:联邦节假日调休:哥伦布日 / 原住民日(Columbus Day / Indigenous Peoples' Day),今日(13日)无更新。
arXiv 2605.26105cs.CV

自回归视频生成中的策略对抗流蒸馏

On-Policy Adversarial Flow Distillation for Autoregressive Video Generation

LIGHTSPEED;University College London(伦敦大学学院)

Yang Luo, Shengju Qian, Xiaohang Tang, Zirui Zhu, Yong Liu, Xin Wang, Yang You

AI总结:

提出策略对抗流蒸馏(AFD)框架,通过策略内对抗性反馈和正向过程流匹配,实现从异构黑盒教师模型向自回归学生模型的高效蒸馏。

摘要:

自回归视频生成器在流式、长时和交互式应用中具有吸引力,但将强大的黑盒教师模型蒸馏到因果学生模型中仍然困难。学生模型必须在其自身的 rollout 分布下学习,而实际教师模型可能只暴露提示条件化的完整视频,并且在架构、容量、时间设计和采样调度上可能不同。这种接口使得监督微调离策略、基于分数的蒸馏不适用,并且直接的对抗性模仿对于去噪时间信用分配过于稀疏。我们提出对抗流蒸馏(AFD),一种用于异构黑盒视频蒸馏的策略内框架。AFD 查询教师模型并在相同提示上 rollout 当前学生模型,训练一个提示配对的 Bradley-Terry 判别器来估计干净样本的教师-学生差异,并将得到的策略内优势转换为学生自身噪声状态上的正向过程流匹配更新。因此,AFD 提供了密集的速度场监督,同时不需要教师分数、潜在变量、去噪轨迹、步骤对齐或反向链强化学习。在两个因果 AR 学生家族上的实验表明,AFD 在保持一般视频质量的同时,持续改善了运动和物理敏感生成,消融实验验证了自适应策略内反馈和正向过程信用分配的重要性。该方法仅需要干净的教师视频和学生 rollout,为将专有或异构视频生成器蒸馏为高效自回归学生模型提供了一条实用途径。

英文摘要:

Autoregressive video generators are attractive for streaming, long-horizon, and interactive applications, but distilling strong black-box teachers into causal students remains difficult. The student must learn under its own rollout distribution, whereas practical teachers may expose only prompt-conditioned completed videos and may differ in architecture, capacity, temporal design, and sampling schedule. This interface makes supervised fine-tuning off-policy, score-based distillation inapplicable, and direct adversarial imitation too sparse for denoising-time credit assignment. We propose Adversarial Flow Distillation (AFD), an on-policy framework for heterogeneous black-box video distillation. AFD queries the teacher and rolls out the current student on the same prompts, trains a prompt-paired Bradley-Terry discriminator to estimate clean-sample teacher-student discrepancy, and converts the resulting on-policy advantage into forward-process flow-matching updates on the student's own noised states. Thus, AFD provides dense velocity-field supervision while requiring no teacher scores, latents, denoising trajectories, step alignment, or reverse-chain reinforcement learning. Experiments across two causal AR student families show that AFD consistently improves motion- and physics-sensitive generation while preserving general video quality, and ablations validate the importance of adaptive on-policy feedback and forward-process credit assignment. The method requires only clean teacher videos and student rollouts, providing a practical route for distilling proprietary or heterogeneous video generators into efficient autoregressive students.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑