A second-order local linearization sampler is shown to reach O~(1/ε) Wasserstein-2 accuracy for strongly log-concave score-based diffusion models, improving on the O~(1/ε²) rate of Euler and exponential integrator schemes.
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Advancing Wasserstein Convergence Analysis of Score-Based Models: Insights from Discretization and Second-Order Acceleration
A second-order local linearization sampler is shown to reach O~(1/ε) Wasserstein-2 accuracy for strongly log-concave score-based diffusion models, improving on the O~(1/ε²) rate of Euler and exponential integrator schemes.