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wai-quantum: an optimisation stops and goes on to the same bytes #597

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dcharlot wants to merge 1 commit from wai/quantum-optimize-resume into main
pull from: wai/quantum-optimize-resume
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2026-11-03

Transaction Science
wai-quantum: an optimisation stops and goes on to the same bytes
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A long optimisation ran to its end in one process or not at all; one
killed partway lost every step. The engine's optimiser now runs from a
checkpoint (engine::variational::optimize_resumable, call_optimize): after
every step its caller has the run as it stands and may stop it there, and
the checkpoint, wai.quantum.optimize-checkpoint/1, holds the steps taken
with their links and the optimiser's whole state (the point, Adam's
moments and the powers of its betas, SPSA's stream, the best point and the
counts), every number as the bits of its f64. Gone on with from any step,
a run ends with the same bytes as one that never stopped, for each
optimiser; a checkpoint of another request, or one whose steps were
changed, is refused (J052).

wai-quantum optimize --checkpoint FILE keeps the state in FILE as it goes
(at most once a second, and when it stops; written whole or not at all),
goes on from FILE when it is there, and removes it when the run ends; a
run killed and started again with the same arguments ends with the same
bytes, receipt and all. --slice N takes at most N steps, then stops with
the state kept (exit 2).

Co-Authored-By: Claude Opus 5.5 <[email protected]>
99123c2f1a
2026-11-03 02:05:08 -05:00