Replaces the kernel's hardcoded `ema_alpha` with the shared `pearls_ad_update`
host-side helper, wires the host-side update across the trainer/collector
boundary (mirrors the A14/A15 Pearl C wiring path), and deletes the
trainer's orphan `launch_reward_component_ema` per
`feedback_wire_everything_up.md`.
Kernel + collector launcher:
- Kernel `reward_component_ema` signature: drops `(isv_out, ema_alpha,
isv_reward_base_slot)` for `(scratch_buf, scratch_first_index=63)`.
Single-block 6-thread (one per component); each writes mean|r_c| to
`scratch_buf[scratch_first_index + c]` with `__threadfence_system()`.
- 6 ISV slots wired with Pearls A+D: ISV[63..69) (Wiener offsets
189..207 — last slots in the post-A13 207-float wiener_state_buf).
- `GpuExperienceCollector::launch_reward_component_ema_inplace` now:
launches kernel → syncs stream → applies Pearls A+D in 6-iteration
loop → memsets reward_components_per_sample to zero (preserves
original behaviour). Degenerate-zero short-circuit per slot covers
the always-zero placeholder components (c=2 trail, c=5 bonus) plus
cold-start.
Cross-boundary wiring (mirrors A14/A15 precedent):
- 4 new fields on `GpuExperienceCollector`:
`reward_component_pearls_{wiener_host_ptr, scratch_dev_ptr,
scratch_host_ptr, isv_pinned_ptr}` — all NULL/0 until wired.
- New setter `set_reward_component_pearls_buffers(...)` on collector.
- New accessors on `GpuDqnTrainer`: `wiener_state_buf_host_ptr()`,
`producer_step_scratch_buf_dev_ptr()`,
`producer_step_scratch_buf_host_ptr()`, `isv_signals_pinned_ptr()`.
- New wire helper `FusedTrainingCtx::wire_reward_component_pearls_buffers`
pulls all 4 pointers from trainer, pushes into collector.
- Wired once in `training_loop.rs::init_gpu_experience_collector`
immediately after `set_curiosity_pearl_c_buffers`.
Orphan deletion (per `feedback_wire_everything_up.md`):
- Removed `GpuDqnTrainer::launch_reward_component_ema` (zero call sites
pre-deletion).
- Removed trainer-side `reward_component_ema_kernel: CudaFunction`
field (zero consumers post-launcher-deletion).
- Removed cubin loader + struct-init line.
- `REWARD_COMPONENT_EMA_CUBIN` static remains because the collector
still loads from it.
Tests:
- `sp4_reward_component_ema_writes_step_obs_via_pearl_a_then_converges_pearl_d`:
drives kernel with N=128 reward_components where r[i*6+c] = sign(i) ×
(c+1), asserts each slot ∈ ±1e-5 of (c+1), non-target slots remain 0,
Pearl A bootstrap + Pearl D convergence verified.
- The cross-boundary wiring path exercised in production by integration
smoke harness; this kernel-direct test isolates kernel signature +
Pearls A+D semantics.
- `cargo test -p ml --lib sp4_wiener_ema --offline` 6/6 passing.
Per `feedback_no_atomicadd.md`,
`feedback_no_htod_htoh_only_mapped_pinned.md`,
`feedback_no_partial_refactor.md`, `feedback_wire_everything_up.md`.
Build: `cargo check -p ml --lib --tests --offline` clean (11 pre-existing
warnings, no new warnings).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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