Matiq/soothe2-re
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

P4: bench all existing parametric LUT sets on full honest corpus — Pchip remains best (0.773)

Browse Source 
All previously-derived parametric LUT forms (u563a60 A=-13.78/68.29/0.344, lut5/
lut4 gamma-LUT, power-law, linear 0.483/0.717, real extracted points) tested on the
full 59-case honest 24-bit metric within one fixed bridge pipeline. None beat the
committed Pchip (0.773; worst powerlaw 6.8). F1 closed: parametric curve production
was already done, none accepted; structural A/B/gamma from ctx+0x188 remains the only
path to bytes (blocked on level-path object live capture).
This commit is contained in:
Matiq
2026-08-20 20:44:20 +03:00
parent cea562b511
commit 1cfe013939
1 changed files with 24 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files
handoff/NOTES_LEVEL.md
+24
View File
@@ -1036,3 +1036,27 @@ reproduce the committed references EXACTLY. => Bit-exact (bytes) is REACHABLE; t
that could have made it impossible (per-run randomization) is closed. The remaining work
to bytes-parity is purely: exact structural chain + exact kernels + internal 48000/4096
geometry + live A/B/gamma, NOT fighting host nondeterminism.
## ============ UPDATE 2026-08-20v: EXISTING PARAMETRIC LUT SETS BENCHED (F1 closure) ============
All previously-derived parametric-LUT sets (from repo scripts + NOTES) tested on the
FULL honest 24-bit corpus (59 cases) inside ONE fixed bridge pipeline
(C = G*LUT(xv)+W*warp^A, gain=(1-C)*res^rp, committed G/W/A/rp). Result:
LUT form mean|err| max
------------------ -------- -----
pchip (committed) 0.773 3.426 <-- BEST (unchanged)
linear (0.483/0.717) 1.017 3.116
realpts (lutpts.npy) 1.134 3.192
u563a60 (A=-13.78/B=68.29/g=0.344) 1.669 6.004
lut5 (0.4356/0.5914/1.999/0.9364) 1.785 3.951
lut4 (fit_lut) 1.785 3.951
powerlaw(C=8) 6.809 11.880
=> The empirical Pchip curve remains the best form-factor; NO existing parametric set
beats it at fixed bridge params. Realistic conclusion: the recovered runtime curve
(NOTES:967) was fit to extracted (xv,C) points, but those points themselves came from
the SAME bridge-shaped model (LUT=xv->C), so parameteric fits overfit their source
and lose on the honest render metric. Pchip baseline (0.773) stays canonical.
F1 (params of the LUT curve) is hereby CLOSED as "already produced, none accepted";
the structural A/B/gamma from ctx+0x188 remains the only path to bytes (blocked:
level-path object not live-captured; see F2/F5.)