Lucas WintherandClaude Sonnet 5.5
3b002059e9
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
82 lines
4.0 KiB
Markdown
82 lines
4.0 KiB
Markdown
# STSheets synthetic benchmark
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A harness that measures guitar-tab transcription quality without any real recordings. It generates original songs in four tiers (t1a to t1d, from solo guitar up to a full band with a second guitar part), writes them as Guitar Pro files, renders audio with a bundled SoundFont, then runs the pipeline (Demucs source separation, Basic Pitch transcription, tempo and beat detection, tab fingering) and scores the result against the known truth. A song passes when merged-guitar pitch F1 is at least 0.85. Oracle modes feed ground truth to later stages so errors can be attributed to a single stage.
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## Prerequisites
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- [Bun](https://bun.sh)
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- ffmpeg (and ffprobe) on `PATH`
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## Commands
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```sh
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bun install
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bun run fetch-models # downloads the ONNX models into models/
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bun test # one test is skipped unless the Demucs drum measurement is enabled by env
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bun run bench gen --tiers t1a,t1b,t1c,t1d --seeds 1-5
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bun run bench run --tiers t1a,t1b,t1c,t1d --seeds 1-5 \
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--modes full,oracle-stems,oracle-tempo,oracle-notes --run-id baseline-2026-10-30
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```
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## On-disk layout
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- `data/<tier>/<seed>/` holds `song.json`, `truth.gp`, `mix.wav`, `mix.mp3` and `stems/`. Git-ignored.
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- `runs/<run-id>/<tier>/<seed>/<mode>/` holds `notes.json`, `out.gp` and `score.json`. Git-ignored.
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- `results/<run-id>.md` and `.json` are the committed reports.
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## Results
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The baseline is in `results/baseline-2026-10-30.md` (tier summaries plus a per-song appendix) with the raw numbers in the matching `.json`.
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## Known caveats
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- Vocals are rendered with a GM "Voice Oohs" patch, not real singing, so vocal numbers are indicative only.
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- Drums use a heuristic baseline transcriber.
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- `oracle-stems` mode feeds the true per-track stems, which reveals the track count and roles, so part-split F1 under oracle-stems (and the oracle modes built on it) is not meaningful.
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- The SONiVOX guitar is partly routed to Demucs' piano stem, a synthetic-timbre gap that lowers full-mode guitar scores.
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- Fingering (string agreement) is informational, not pass/fail.
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## Aligning reference songs
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Team-supplied real recordings and Guitar Pro-exported MIDI live in the git-ignored `reference/` directory (never commit them; `*.flac`, `*.mid` and `runs/` are ignored too). Each song gets `reference/<id>/` with its audio, MIDI and `alignment.json`, and `reference/songs.json` lists the registered songs.
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Register a song (guesses a scoring role per MIDI track; unmapped tracks are `null`):
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```sh
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bun run align add <audio> <midi> --id <id> [--title <t>] [--capo "<track name>=9"]
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```
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The `--capo` track name must match the MIDI track name exactly, including any trailing space (e.g. `"Acoustic Guitar =9"`).
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Compute and save an automatic alignment (all anchors `auto`; manual anchors from an earlier save are kept) and print its fit summary:
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```sh
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bun run align auto <id>
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```
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Launch the alignment page. A bare `bun run align` starts a long-running server; the key in the printed URL is required and changes on every start. For LAN use:
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```sh
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bun run align --host 0.0.0.0 --url-host 10.20.20.2
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```
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Page workflow:
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1. Pick a song and add anchors where the MIDI and the recording visibly disagree (click the waveform/roll to pin a MIDI time to an audio time).
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2. Play and mix: toggle the recording and the rendered MIDI, and per-role levels, to listen for sync.
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3. Run auto-align around anchors; manual anchors are kept fixed and the rest is recomputed.
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4. Save to write `alignment.json`.
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Benchmark against the real songs (uses each saved `alignment.json`; `--auto` computes one on the fly for songs without it):
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```sh
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bun run bench real [--auto] --run-id <id>
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```
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This writes `results/real-<id>.md` and `.json` (committed) and per-song output under `runs/real-<id>/` (ignored).
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Caveats:
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- The fit summary (matched MIDI onsets, median residual, flagged windows) is a consistency measure between the MIDI and the audio, not ground truth; a high match rate does not prove the alignment is right.
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- The page plays Ogg Opus; Safari needs 18.4 or later.
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