TRLANToken Ring Lan
TRLANToken-Ring Local Area Network
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For exact shifts, we selected shifts using the max-[gamma] strategy from Thick Restart Lanczos [37]; we noticed that this produced equivalent matrix-vector product counts compared to the Fortran implementation of TRLan [36] accessed via the SLEPc4Py [1] bindings.
The results reported here contrast with those reported in [40], where Chebyshev-Davidson was reported to outperform TRLan. In the results reported in [40, Figure 6.2], one can see that run times decrease despite increasing matrix-vector product counts.