Continuous Adversarial MeanFlow Transfer

• URL: http://arxiv.org/abs/2608.19540v2
• Date: Sat, 22 Aug 2026 18:22:10 GMT
• Title: Continuous Adversarial MeanFlow Transfer
• Abstract summary: Adversarial refinement is proven effective for few-step quality, but not for the finite-interval average velocities that MeanFlow (MF) models predict.<n>We propose MeanFlow-Transfer, which maps heterogeneous source outputs into a shared velocity representation.<n>We then introduce Continuous Adversarial MeanFlow, a post-training stage that extends adversarial flow models from instantaneous velocities to MF's finite-interval average velocities.
• Score: 30.946652462509068
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Training fast generators on new domains with limited data remains challenging for two reasons. First, adapting a pretrained diffusion or flow model to a new domain leaves its costly multi-step sampling unaddressed, and existing acceleration methods are tied to the source parameterization--$ε$, $x$, $v$, or $u$--leaving heterogeneous pretrained models with no common acceleration target. Second, while adversarial refinement is proven effective for few-step quality, it is formulated only for instantaneous-velocity flows, not for the finite-interval average velocities that MeanFlow (MF) models predict. We address both problems. We propose MeanFlow-Transfer, which maps heterogeneous source outputs into a shared velocity representation, uses it to initialize an MF generator from the source weights, and optimizes an MF objective on the target domain. This unifies adaptation and acceleration in a single training loop across a broad range of pretrained models. We then introduce Continuous Adversarial MeanFlow, a post-training stage that extends continuous adversarial flow models from instantaneous velocities to MF's finite-interval average velocities. CAMF contrasts changes in a learned potential between real and predicted interval endpoints, recovering fine detail that MF regression averages away, and reduces to the instantaneous criterion in the vanishing-interval limit. Adapting four ImageNet-based source models--DiT ($ε$), SiT ($v$), JiT ($x$), iMF ($u$)--to five target domains, MF-T with CAMF matches or exceeds the fine-tuned teacher in FID and FDD at up to $125\times$ fewer Neural Function Evaluations (NFEs), while CAMF improves MF-T's few-step FID by $29\%$ on average.

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