I am trying to implement GNFS in python and I wanted to make it as fast as possible just because. I am trying to find a resource that will help me implement Block Lanczos but so far haven't seen many papers on the subject. Can someone please direct me to a good one that will help me somewhat understand and implement the algorithm? Thanks.
2026-03-27 20:00:59.1774641659
Resource to implement Block Lanczos in python;.
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There's an old implementation in C with extensive comments at https://web.archive.org/web/20200114212239/http://www.friedspace.com/QS/QS-2.0/lanczos.c as part of SIMPQS. It is adapted from Jason Papadopoulos's implementation, presumably an earlier instance of https://github.com/radii/msieve/tree/master/common/lanczos.