# W9 implementation report

Branch: `zdp/8-train-fast`  
Worktree: `/home/pablo/.paseo/worktrees/26sr02x6/dirty-swan`

1. **APPLIED — runtime accelerator flags.** `dbfe5716` adds `--compile-mode`, `--channels-last`, `--fused-adamw`, and `--amp-dtype`. Defaults preserve current behavior. Production CUDA isolation passed one compiled, channels-last step with fused AdamW.

2. **APPLIED — schedule controls.** `9a19baef` adds OneCycle overrides and constant-cooldown; `559b10fe` fixes its optimizer-step boundary. Tests prove default scheduler-state equality and a `[0.7, 0.4, 0.1]` cooldown tail.

3. **APPLIED — progressive resolution.** `1e552eaa` parses fractional resolution stages, rebuilds the loader at boundaries, and persists `training_stage`. `zipdepth/catalog/dataset.py` was unchanged.

4. **APPLIED — named presets.** `8620cba1` adds `--preset {v4,fast}` and persists the resolved recipe. `fast` currently aliases bit-compatible `v4`; winning fast values remain **DEFERRED** until the hill-climb.

5. **APPLIED — tests/static gates; live gate externally blocked.** `ca49e726` strengthens bit-exact model-state and runtime override coverage. Final results: lint passed, typecheck passed with 0 errors, deadcode passed, **103 tests passed, 1 skipped**. Tyro help exposes every requested flag.

The live command was attempted twice:

```bash
pixi run -e zipdepth-catalog-dev --frozen zipdepth-catalog-train-smoke --compile-mode default --channels-last --fused-adamw
```

Both attempts failed before training because the shared catalog returned `ScanSegmentTable failed: http2 error (Unavailable)` from `127.0.0.1:51235`. The server was not killed or restarted. Rerun the command once the catalog is healthy; expect the loss, resume, torchrun, checkpoint-inference, and final `catalog smoke passed` gates.

Safeguards: clean worktree; no push or branch switch; no vendored, dataset, loss, architecture, or evaluation changes.

Full report: [W9-REPORT.md](/tmp/zdp-recut/apply/W9-REPORT.md)