Full covariance matching in Gaussian DDPMs yields O(1/T^2) path KL error and is enabled by the training-free Lanczos Gaussian sampler using Jacobian-vector products.
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The Value of Covariance Matching in Gaussian DDPMs and the Lanczos Sampler
Full covariance matching in Gaussian DDPMs yields O(1/T^2) path KL error and is enabled by the training-free Lanczos Gaussian sampler using Jacobian-vector products.