Correcting CondOT: Exact Finite-Step Sampling in Gaussian Flow Matching

Flow matching generates samples by gradually transforming noise into data. In practice, using a finite number of sampling steps introduces a numerical error that depends on the chosen schedule. We study this dependence for Gaussian targets and the explicit midpoint sampling method, using the exact flow field. We measure sampling error by the squared Wasserstein distance between the target distribution and the final distribution produced by the midpoint sampler. We show that the standard conditional optimal transport (CondOT) schedule cancels the leading midpoint error and improves the general convergence bound, even when the sampling steps are unequally spaced. On a uniform grid of S sampling steps, we fix the signal schedule at αt=t and prove the existence of scalar noise schedules βt that approach the CondOT noise schedule 1-t at rate 1/S and yield exact Gaussian sampling for every sufficiently large S. Controlled Gaussian experiments illustrate the convergence rates and exact calibration.