URGE performs unbiased path-wise importance reweighting via Girsanov estimation for derivative-free inference-time scaling in diffusion models, proving equivalence to particle-wise SMC and outperforming baselines empirically.
SURGE consistently improves both SDA and FlowDAS backbones
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SURGE: Approximation-free Training Free Particle Filter for Diffusion Surrogate
URGE performs unbiased path-wise importance reweighting via Girsanov estimation for derivative-free inference-time scaling in diffusion models, proving equivalence to particle-wise SMC and outperforming baselines empirically.