Enumeration Case

SparsePreconditionerDiagScaling

A diagonal scaling preconditioner.

Declaration

SparsePreconditionerDiagScaling

Discussion

Applies y = D¹x, where D is the diagonal matrix such that d_ii = A_j ‖₂ with A_j the j-th column of A. It provides a simple preconditioner for LSMR.

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