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Algorithms
This appendix documents two performance-oriented algorithmic
infrastructures inside XSPEC: the analytic vector-Jacobian-product
(VJP) gradient pipeline used by fit with leven,
fit with migrad and hmc, and the optional
rank-
SVD compression of the OGIP response matrix consumed in
the convolution step. Both are opt-in or opt-out without
changing the science output, but each can change the elapsed-time cost
substantially on the right kind of workload.
Subsections