jgrusewski
731cae4c80
fix(sp14): A.2 — lift set_aux_weight clamp to SP13 P0b range [0.15, 1.5]
...
The pre-fix clamp at gpu_dqn_trainer.rs:14722 was [0.05, 0.3] — the
SP11-era cap. P0b's controller computes aux_w in [0.15, 1.5] (base
0.5 × [0.3, 3.0]) but the setter silently chopped everything above
0.3, masking the deficit-amplification term entirely.
Smoke A trace confirmed:
Fold 0/1: raw aux_w = 0.66-0.80 → clamped to 0.30 (deficit invisible)
Fold 2: raw aux_w = 0.164 (stagnation; below clamp) → 45% deficit
Post-fix: deficit-amp term `(1 + 5 × deficit)` actually expresses
through to the trainer. Fold 2 stagnation will get the designed
floor 0.15 instead of being capped at 0.3 — but the upper range
1.5 also opens, so deficit-amp can pull aux_w up when accuracy is
below target.
Constants imported from sp13_isv_slots.rs (AUX_W_BASE=0.5,
AUX_W_HARD_FLOOR_RATIO=0.3, AUX_W_HARD_CEIL_RATIO=3.0). No new
slots; existing constants exposed as the clamp bounds.
Test: set_aux_weight_clamp_range verifies constants resolve correctly.
A.1 (C51 atom-probability floor) deferred — Phase 0 verification
found the spec's stated `−log(p)/p · ∂p/∂z` divide does NOT exist
in c51_grad_kernel.cu at HEAD 037c24116; actual kernel uses the
numerically-stable `expf(lp) - proj`. The 1109 GRAD_CLIP_OUTLIER
events in Smoke A are real but their mechanism is different. Will
be re-spec'd as a separate task post-SP14.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com >
2026-05-05 17:52:18 +02:00
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