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test(alpha): chained pipeline smoke — Task 12 wiring validation

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End-to-end test for the kernel COMPOSITION that the H=600 DQN smoke
(Task 12 proper) will use at each rollout boundary:

  t+0  alpha_kill_criteria_compute_kernel  → scratch[0..4]
  t+1  apply_pearls_ad_kernel(n_slots=4)   → ISV[539..543]

The two prior alpha_kernels smokes (munchausen + kill_criteria) validated
kernels in isolation. This smoke validates the COMPOSITION on the same
stream — failures here are different (stream-ordering, Pearls index base,
Wiener offset base, scratch visibility) and would silently break Task 12.

Two iterations with stationary synthetic inputs:

  Iter 1 (Pearl A bootstrap)
    prev_x_mean=0 AND x_lag=0 → ISV[539..542] populated with raw scratch
    observations = [0.2041, 0.8980, 1.0670, 0.1] within 0.01 tolerance.
    Anchor slots 547/548 remain at Task 7c values (-5185, 4953).

  Iter 2 (Pearl D stationary)
    dx_mean = dx_step = 0 → α* = 0 → ISV unchanged from iter 1 within
    1e-4. Stationary signal stays at the bootstrap value.

Test would catch:
  - Producer's scratch write not visible to applicator (stream-ordering)
  - Wrong Pearls isv_idx_base / wiener_offset_base
  - Pearl A sentinel detection broken (formula yields 0 at t=0)
  - Wiener state corruption (iter 2 drifts from iter 1)

Reuses launch_apply_pearls from sp4_wiener_ema.rs (pub(crate)). Helper
fn run_chained_iter factors the producer→applicator sequence so the two
iterations are byte-identical apart from the Wiener state's evolution.

`cargo test -p ml --lib alpha_kernels`: 4 pass (compile witness + 2 prior
GPU smokes + this chained smoke) on RTX 3050 Ti in 1.89s total. Audit doc
docs/isv-slots.md updated per Invariant 7.

Remaining Task 12 work (full H=600 DQN trainer integration with this
pipeline at rollout boundaries) is queued for a dedicated session.
This commit is contained in:
jgrusewski
2026-05-15 15:14:56 +02:00
parent 697bb586d0
commit ebbd28437a
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@@ -618,3 +618,30 @@ Both launchers follow `launch_apply_pearls` (in `sp4_wiener_ema.rs`) — pre-loa
ISV buffer is sized to 552 floats with the production slot indices populated using the committed Task 7c baseline values; this exercises the slot-indexing path through `isv[random_baseline_mean_slot]` / `isv[random_baseline_std_slot]` reads.
Companion to the `munchausen_target_smoke_matches_hand_computation` test (91d1a52b9). Both pass on RTX 3050 Ti.
## Phase E.1 Task 12 wiring — chained pipeline smoke (2026-05-15)
`crates/ml/src/cuda_pipeline/alpha_kernels.rs::tests::kill_criteria_chained_with_pearls_populates_isv_slots` is the gating composition smoke for the H=600 DQN smoke (Task 12 proper). Validates that `alpha_kill_criteria_compute_kernel` correctly composes with the canonical `apply_pearls_ad_kernel` on the same stream:
```
t+0 alpha_kill_criteria_compute_kernel → scratch[0..4]
t+1 apply_pearls_ad_kernel(n_slots=4) → ISV[539..543]
```
Two iterations with stationary synthetic inputs:
- **Iter 1 (Pearl A bootstrap)**: prev_x_mean=0 AND x_lag=0 → ISV[539..542] = raw observations = [0.2041, 0.8980, 1.0670, 0.1] within 0.01 tolerance. Anchor slots 547/548 must remain at Task 7c values (-5185, 4953) — Pearls only writes 539..542.
- **Iter 2 (Pearl D stationary)**: dx_mean = dx_step = 0 → α* = 0 → ISV unchanged from iter 1 within 1e-4. Stationary signal stays at the bootstrap value.
Tests it would catch:
- Producer's scratch write not visible to applicator (stream-ordering bug) → iter 2 produces 0
- Wrong Pearls `isv_idx_base` → ISV slots wrong
- Wrong `wiener_offset_base` → Wiener state corruption visible at iter 2
- Pearl A sentinel detection broken → iter 1 produces 0 (formula yields 0 at t=0 without sentinel branch)
Reuses `launch_apply_pearls` from `sp4_wiener_ema.rs` (pub(crate)); both kernels load directly from cubins via `include_bytes!`.
Companion to `munchausen_target_smoke_matches_hand_computation` and `kill_criteria_smoke_matches_hand_computation`. All three pass on RTX 3050 Ti in ~2s total.
The full H=600 DQN training smoke (real trainer integration with this pipeline at rollout boundaries) is the remaining Task 12 work, queued for a dedicated session.