A rank-revealing QR based feature filter plus a sparsity-preserving right preconditioner cuts the condition number of domain-decomposed random feature PDE systems by up to 11 orders of magnitude and speeds LSQR convergence 10 to 1000 times.
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Local Feature Filtering for Scalable and Well-Conditioned Domain-Decomposed Random Feature Methods
A rank-revealing QR based feature filter plus a sparsity-preserving right preconditioner cuts the condition number of domain-decomposed random feature PDE systems by up to 11 orders of magnitude and speeds LSQR convergence 10 to 1000 times.