Core Concepts
Developing non-asymptotic theory for understanding data generation in diffusion models.
Abstract
Introduction
Diffusion models are crucial in generative modeling.
Forward and reverse processes are key components.
Algorithms and Results
Deterministic Sampler
Convergence rate proportional to 1/T.
Improved convergence compared to past results.
Accelerated Deterministic Sampler
Achieves faster convergence with additional estimates.
Stochastic Sampler
Convergence rate proportional to 1/√T.
Accelerated version improves convergence to 1/ε.
Related Works
Prior works lacked quantitative convergence guarantees.
Recent studies show polynomial convergence with accurate score estimates.
Stats
"For a popular deterministic sampler, we demonstrate that the number of steps needed to yield ε-accuracy is proportional to 1/ε."
"For another DDPM-type stochastic sampler, we establish an iteration complexity proportional to 1/ε2."
Quotes
"Our theory is developed based on an elementary yet versatile non-asymptotic approach."
"The accelerated variants achieve more rapid convergence."