feat(delphi): Q12 carve-out — pin the cold-tick PCA start to ones in both replay drivers#2655
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feat(delphi): Q12 carve-out — pin the cold-tick PCA start to ones in both replay drivers#2655jucor wants to merge 1 commit into
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This was referenced Jul 22, 2026
docs(delphi): R1-parity goal docs, journal (2026-07-18 → 07-22 s3), quirks + divergence ledger
#2626
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…both replay drivers Production Clojure draws an UNSEEDED random PCA start vector on the cold tick (rand-starting-vec, pca.clj:79-82 — the original author's own 'should really throw a [seeded] random number generator in the equation here... XXX'); with a small eigengap the fixed 100 power iterations keep a start-dependent residual (~4e-4 on pc-smallmix-01 step 0), so even two Clojure runs differ on cold ticks. No deterministic reference exists. Both replay drivers now pin the cold start to the ONES vector — the exact value power-iteration already pads new-comment columns with (pca.clj:46-49 / pca.py _power_iteration) — by seeding the conv with a single-element [1.0] start that the padding expands to any width (dev/replay.clj certify-cold-start-pca; polismath/replay/driver.py). Warm ticks take the real previous comps from tick 2 exactly as before. Logged per run. CLOJURE_QUIRKS.md Q12. Battery effect: pc-smallmix-01 and pc-midmix-01 went DIVERGENCE -> MATCH; pc-revote-01's step 0 cleared (residual from step 1 = split-loop extraction order on tie-dense 15-comment geometry, diagnosed separately). 14/15 MATCH with the five prodclone extractions in the battery. commit-id:6b40e1bf
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Production Clojure draws an UNSEEDED random PCA start vector on the cold
tick (rand-starting-vec, pca.clj:79-82 — the original author's own
'should really throw a [seeded] random number generator in the equation
here... XXX'); with a small eigengap the fixed 100 power iterations keep
a start-dependent residual (~4e-4 on pc-smallmix-01 step 0), so even two
Clojure runs differ on cold ticks. No deterministic reference exists.
Both replay drivers now pin the cold start to the ONES vector — the
exact value power-iteration already pads new-comment columns with
(pca.clj:46-49 / pca.py _power_iteration) — by seeding the conv with a
single-element [1.0] start that the padding expands to any width
(dev/replay.clj certify-cold-start-pca; polismath/replay/driver.py).
Warm ticks take the real previous comps from tick 2 exactly as before.
Logged per run. CLOJURE_QUIRKS.md Q12.
Battery effect: pc-smallmix-01 and pc-midmix-01 went DIVERGENCE -> MATCH;
pc-revote-01's step 0 cleared (residual from step 1 = split-loop
extraction order on tie-dense 15-comment geometry, diagnosed separately).
14/15 MATCH with the five prodclone extractions in the battery.
commit-id:6b40e1bf
Stack: