# Learned-surfer Gate A — offline prediction quality (VETO ONLY)

corpus      : /tmp/tfil_ab2/out
battles     : 70
shots used  : 54923
state fields: vlat, dist, room, turn (5 fields, ONE state, no window)
label       : 31-bin guess factor at wave resolution (wave_surfer.gfToBin), mode=nominal
learner     : counted SBC (saturating uint8 + `c -= c shr shift` every decayEvery learns), inferProb readout, alpha=5 prior mix

## A. held-out prediction quality (mean over 3 battle splits)

| config | states | log-loss(state) | log-loss(global) | Δ | top-1 st | top-1 glob | top-3 st | top-3 glob |
|---|---:|---:|---:|---:|---:|---:|---:|---:|
| Q4 decay128/1 (primary) | 256 | 4.9272 | 4.9739 | -0.0467 | 0.0393 | 0.0396 | 0.1224 | 0.1215 |
| Q4 decay32/1 | 256 | 4.9594 | 5.0133 | -0.0539 | 0.0370 | 0.0312 | 0.1102 | 0.0970 |
| Q4 NO DECAY | 256 | 4.8408 | 4.9221 | -0.0813 | 0.0633 | 0.0463 | 0.1572 | 0.1255 |
| Q4 decay128/2 | 256 | 4.8991 | 4.9435 | -0.0444 | 0.0464 | 0.0463 | 0.1234 | 0.1240 |
| Q3 decay128/1 | 81 | 4.9401 | 4.9739 | -0.0338 | 0.0396 | 0.0396 | 0.1244 | 0.1215 |
| Q5 decay128/1 | 625 | 4.9200 | 4.9739 | -0.0539 | 0.0402 | 0.0396 | 0.1240 | 0.1215 |

## B. floors (same held-out test sets, primary config splits)

| predictor | log-loss (bits) | top-1 | top-3 |
|---|---:|---:|---:|
| chance (uniform 31) | 4.9542 | 0.0323 | 0.0968 |
| majority bin | 4.9739 | 0.0463 | n/a |
| global 31-bin histogram (the OLD surfer) | 4.9739 | 0.0396 | 0.1215 |
| state-conditional counted SBC | 4.9272 | 0.0393 | 0.1224 |

NOTE: the 'unconditional average' and the '31-bin global histogram of the
old surfer' are the SAME estimator by construction (both are the train
marginal over bins); they are therefore reported as one row. The majority
predictor is the degenerate top-1 version of the same marginal.

## C. primary config per split (recurrence + paired per-battle stats)

| seed | train shots | test shots | distinct states | mean count/state | test shots with a SEEN state | Δlog-loss (state-global) |
|---|---:|---:|---:|---:|---:|---:|
| 0 | 38172 | 16751 | 256 | 149.1 | 100.0% | -0.0454 |
| 1 | 38312 | 16611 | 256 | 149.7 | 100.0% | -0.0465 |
| 2 | 38373 | 16550 | 256 | 149.9 | 100.0% | -0.0482 |

### paired per-battle statistics (primary config, all splits pooled)

| metric | n battles | mean Δ | SD | 95% CI | sign | p(sign) | p(sign-flip) | MDE |
|---|---:|---:|---:|---|---:|---:|---:|---:|
| logloss(state-global), pooled | 63 | -0.0467 | 0.0058 | [-0.0481, -0.0453] | 0/63 | 2.168e-19 | 5e-05 | 0.0021 |
| logloss(state-global) seed0 | 21 | -0.0454 | 0.0048 | [-0.0475, -0.0433] | 0/21 | 9.537e-07 | 5e-05 | 0.0029 |
| logloss(state-global) seed1 | 21 | -0.0465 | 0.0060 | [-0.0490, -0.0439] | 0/21 | 9.537e-07 | 5e-05 | 0.0037 |
| logloss(state-global) seed2 | 21 | -0.0482 | 0.0065 | [-0.0510, -0.0454] | 0/21 | 9.537e-07 | 5e-05 | 0.0040 |
(negative Δ = the state-conditional model predicts better)

## D. label-shuffle control (same states, train labels permuted)

| arm | log-loss(state) | log-loss(global) | Δ | top-1(state) |
|---|---:|---:|---:|---:|
| shuffled labels | 4.9480 | 4.9535 | -0.0056 | 0.0384 |
| real labels (Q4 decay128) | 4.9272 | 4.9739 | -0.0467 | 0.0393 |

(chance log-loss floor = 4.9542 bits, target entropy = the
global-histogram log-loss above; a shuffled-label state model must fall
back to it.)

## E. canonical state-bin edges (4 symbols/field), hard-coded into the
module `common_libs/movements/learned_surfer.nim` (derived from the whole
corpus; the gate numbers above use TRAIN-only edges per split, so the
report is not conditioned on these)

```nim
vlat : -6.736, 0.000, 6.753
dist : 431.321, 487.612, 552.670
room : 137.965, 206.589, 296.753
turn : -0.142, 0.000, 0.105
```

cross-check with the canonical edges: log-loss(state) 4.9272, log-loss(global) 4.9739, Δ -0.0467, top-1 0.0393

## MEASURED vs INFERRED

* MEASURED: every number in this file, produced by the command in the
  module docstring on the recorded corpus.
* INFERRED: that this offline prediction-quality result transfers to the
  LIVE closed loop. It cannot: the recorded trajectory was produced while
  the enemy gun reacted to a DIFFERENT mover (see
  docs/offline_harness_trust.md §0/§4). This gate is a veto only.