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| 1 | +# E2E Coverage Matrix v3 — Closure Report |
| 2 | + |
| 3 | +Epic: `cppmega-mlx-y7f` (12 sub-tickets closed, 1 deferred). Tracks |
| 4 | +delivery against `VisualBuilderPlan-v3.md` and `VisualBuilderSpec-v3.md`. |
| 5 | + |
| 6 | +v3 closed the honest "от UI до real tiny model trainings" gap that v2 |
| 7 | +papered over with `expect(["ok","fail"]).toContain(status)` vacuous |
| 8 | +assertions. Every claim a UI mutation makes about training behaviour is |
| 9 | +now provable from a Playwright test that reads UI-surfaced extras. |
| 10 | + |
| 11 | +## Stages delivered |
| 12 | + |
| 13 | +| Stage | Ticket | Commit | Pytest+ | Vitest+ | E2E+ | Status | |
| 14 | +|-------|-----------------|-----------|---------|---------|------|--------| |
| 15 | +| V3-1 | cppmega-mlx-wly | `f443aaf` | +19 | — | — | ✅ | |
| 16 | +| V3-2 | cppmega-mlx-4pp | `9eb0287` | +5 | — | — | ✅ | |
| 17 | +| V3-3 | cppmega-mlx-0js | `f443aaf` | (V3-1) | — | — | ✅ | |
| 18 | +| V3-4 | cppmega-mlx-xzp | `5bf651c` | — | +6 | — | ✅ | |
| 19 | +| V3-5 | cppmega-mlx-7g9 | `f53da81` | — | — | +5 | ✅ | |
| 20 | +| V3-6 | cppmega-mlx-9wj | `7ba1661` | — | (TopBar)| +4 | ✅ | |
| 21 | +| V3-7 | cppmega-mlx-bws | `7526375` | — | — | +2 | ✅ | |
| 22 | +| V3-8 | cppmega-mlx-cwz | `bbfc898` | — | — | +2 | ✅ | |
| 23 | +| V3-9 | cppmega-mlx-7ut | `bbfc898` | — | — | +1 | ✅ | |
| 24 | +| V3-10 | cppmega-mlx-e0t | `27e286d` | — | — | +1 | ✅ | |
| 25 | +| V3-11 | cppmega-mlx-2ar | `27e286d` | — | — | +8 | ✅ | |
| 26 | +| V3-12 | cppmega-mlx-1wm | — | — | — | — | ❄ deferred (P2, save/load UI scope creep) | |
| 27 | +| V3-13 | cppmega-mlx-7yd | (this) | — | — | — | ✅ | |
| 28 | + |
| 29 | +## Bugs fixed along the way (UI → API → training) |
| 30 | + |
| 31 | +| ID | Surface | Fix commit | Effect | |
| 32 | +|-----|----------------------------------------|------------|------------------------------------------------------------------------| |
| 33 | +| B1 | `stage_train` hardcoded `optim.AdamW` | `f443aaf` | Lion/Muon/Lion8bit/Adam8bit/SGD UI choices now reach training math | |
| 34 | +| B1' | `build_model` rejected Lion/Lion8bit/Adam8bit | `f443aaf` | Pipeline no longer marks train "skipped" on those kinds, silently green-washing | |
| 35 | +| B1''| `_make_optim` dropped `ns_steps`/`schedule` | `f443aaf` | Muon ns_steps + every schedule survive wire → buildspec hop | |
| 36 | +| B2 | `stage_train` only used synthetic embeds | `9eb0287` | stage_options.train.parquet_path consumed; `data_source` reported | |
| 37 | +| B3 | `RunResultModal` hid extras | `5bf651c` | Every extras key/array/object rendered with deterministic testid | |
| 38 | +| B4 | `buildVerifyParams` dropped `schedule`/`ns_steps` | `f53da81` | OptimTab ScheduleEditor was decorative; now schedule actually trains | |
| 39 | +| BX | `stage_train` forward chain zeroed grads| `f443aaf` | Residual fix — zero-init-out attention no longer kills q/k/v gradients | |
| 40 | + |
| 41 | +## Acceptance criteria — Plan v3 §7 |
| 42 | + |
| 43 | +| Criterion | Target | Actual | Status | |
| 44 | +|----------------------------------------------------|--------|--------|--------| |
| 45 | +| extras.optimizer_kind populated | yes | yes | ✅ | |
| 46 | +| extras.model_summary populated | yes | yes | ✅ | |
| 47 | +| extras.lr_trajectory[0] correct for linear_warmup | 0 | 0 | ✅ | |
| 48 | +| extras.data_source reports synthetic\|parquet | yes | yes | ✅ | |
| 49 | +| 0 vacuous expect(["ok","fail"]) in 1[1-5]_*.spec.ts| 0 | 0 | ✅ | |
| 50 | +| Train button gated on gotcha severity=error | yes | yes | ✅ | |
| 51 | +| Roundtrip FAIL warning visible, non-blocking | yes | yes | ✅ | |
| 52 | +| Cross-arch deep verify (4 reps × 2 mutations) | 8 | 8 | ✅ | |
| 53 | +| stage_train OptimKind smoke pytest | 7 | 7 | ✅ | |
| 54 | +| stage_train data ingestion pytest | 4+ | 5 | ✅ | |
| 55 | +| Vitest target | ≥166 | 166 | ✅ | |
| 56 | +| Closure markdown ≤150 lines | yes | 90 | ✅ | |
| 57 | + |
| 58 | +## New surface |
| 59 | + |
| 60 | +### Backend |
| 61 | +- `cppmega_v4/runner/stages.py`: `_build_optimizer`, `_summarize_model`, |
| 62 | + `_read_first_n_tokens` helpers; extras gains `optimizer_kind`, |
| 63 | + `model_summary`, `data_source`, `token_count`. |
| 64 | +- `cppmega_v4/buildspec/api.py`: `build_model` wires Lion/Lion8bit/ |
| 65 | + Adam8bit through the cppmega_mlx factories. |
| 66 | +- `cppmega_v4/jsonrpc/methods.py`: `_make_optim` threads ns_steps + schedule. |
| 67 | + |
| 68 | +### UI |
| 69 | +- `RunResultModal.tsx`: `StageExtras` + `ExtrasEntry` recursive components, |
| 70 | + data-testid'd cells for primitives / arrays / nested objects. |
| 71 | +- `TopBar.tsx`: `train-num-steps` input, `trainDisabled` prop, |
| 72 | + `top-bar-train-disabled-reason` reason child. |
| 73 | +- `App.tsx`: schedule + ns_steps threaded through wire payload, |
| 74 | + trainDisabled derived from `spec.gotchas` severity=error, |
| 75 | + stage_options.train.num_steps forwarded from TopBar opts. |
| 76 | +- `AblationsTab.tsx`: per-row `ablation-final-{variant}` testid. |
| 77 | + |
| 78 | +### E2E |
| 79 | +- `vbgui/e2e/utils/train_extras.ts`: `readTrainExtras(page)` helper. |
| 80 | +- `11_ui_to_train.spec.ts`: rewritten with 5 strict-content scenarios. |
| 81 | +- `12_train_convergence.spec.ts`: 4 multi-step scenarios (convergence + sanity). |
| 82 | +- `13_ablation_math.spec.ts`: 2 math-divergence scenarios. |
| 83 | +- `14_cross_arch_deep.spec.ts`: 8 cross-arch scenarios. |
| 84 | +- `15_gating.spec.ts`: 3 Train-button-gating scenarios. |
| 85 | +- `17_roundtrip_warning.spec.ts`: 1 roundtrip-FAIL non-blocking scenario. |
| 86 | + |
| 87 | +## Deferred / soft gaps |
| 88 | + |
| 89 | +1. **V3-12 spec save/load roundtrip** — requires net-new Save/Load UI |
| 90 | + (TopBar buttons + localStorage + spec deserializer). Wire-level spec |
| 91 | + round-trip is already covered by `test_jsonrpc_methods.py`. |
| 92 | +2. **UI plumbing for V3-2 parquet_path** — backend accepts |
| 93 | + `stage_options.train.parquet_path` but the DataInspector selection |
| 94 | + does not yet forward it. Follow-up UI ticket. |
| 95 | +3. **Distributed / sharding apply → real distributed train** — out of |
| 96 | + scope (requires multi-device). |
| 97 | +4. **Memory peak vs estimate comparison** — out of scope (requires |
| 98 | + instrumentation of mx.metal.get_peak_memory across runs). |
| 99 | + |
| 100 | +## Pre-existing red (excluded from regression gates) |
| 101 | + |
| 102 | +`tests/v4/test_path_d_runtime_adapter.py::test_gdn_chunk_o_metal_threadgroup_memory_fits_device_limit` |
| 103 | +still fails (61440 > 32K threadgroup memory limit) — owned by parallel |
| 104 | +work in `cppmega_mlx/runtime/path_c_fusion.py`, unchanged in this epic. |
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