A two-step framework recovers multidimensional phase functions from indirect operator access and factorizes the kernel with a butterfly structure for O(N log N) matvecs.
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Multidimensional Phase Recovery and Interpolative Decomposition Butterfly Factorization
A two-step framework recovers multidimensional phase functions from indirect operator access and factorizes the kernel with a butterfly structure for O(N log N) matvecs.