Overflow-avoiding and reduced-complexity variants of memory AMP are derived, and the finite-precision divergence of warm-started CG-VAMP is traced to catastrophic cancellation in orthogonalization parameters.
Mutual information and optimality of approximate message-passing in random linear estimation,
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Memory AMP: Overflow Avoidance, Complexity Reduction, and Comparative Analysis
Overflow-avoiding and reduced-complexity variants of memory AMP are derived, and the finite-precision divergence of warm-started CG-VAMP is traced to catastrophic cancellation in orthogonalization parameters.