(Optional) Set the type of Krylov solver to use.
(Optional) Set the type of Krylov solver to use. Current krylov methods set by solver_type are: \begin{tabular}{l@{ -- }l} 0 PCG (default) 1 GMRES 2 BiCGSTAB
Current krylov methods set by solver_type are:
\begin{tabular}{l@{ -- }l} 0
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