79 lines
4.1 KiB
Markdown
79 lines
4.1 KiB
Markdown
# Verifying AetherArena (you don't have to trust us)
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AA's credibility rests on a stranger being able to reproduce a score and see that the rules are fair. This is the **launch gate** (ADR-149 §7): v0 does not ship until all five checks below pass for someone with no insider access.
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> **Wider context:** this page covers the *leaderboard scorer*. For the whole-platform answer to
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> "is this real / does it actually work?" — including the deterministic pipeline proof, the
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> published models + public-benchmark numbers, and the built-in-public development trail — see
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> [`docs/proof-of-capabilities.md`](../docs/proof-of-capabilities.md).
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## The open scorer
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The scoring engine is a pure-Rust, GPU-free binary: `aa_score_runner` in `wifi-densepose-train`. It runs the real `ruview_metrics` pose-acceptance harness on a fixed fixture and emits a cross-platform-stable SHA-256 **determinism proof**.
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### Reproduce the determinism hash locally
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```bash
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cd v2
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# Verify the committed expected hash still matches (this is the CI gate):
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cargo run -q -p wifi-densepose-train --bin aa_score_runner --no-default-features
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# → prints the witness (inputs_sha256 + proof_sha256) and "VERDICT: PASS"
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# See the witness row as JSON:
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cargo run -q -p wifi-densepose-train --bin aa_score_runner --no-default-features -- --json
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```
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### Witness chain — proof + repeatability analysis
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Every score is a **witness**: `inputs_sha256` (binds it to the exact inputs scored)
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+ `proof_sha256` (cross-platform-stable hash of the quantised score) + `harness_version`.
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Witnesses are recorded in an **append-only, hash-chained ledger** (each row references
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the previous row's hash), so a silent edit to any past row breaks the chain.
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```bash
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# Repeatability: run the scorer K times, confirm ONE identical proof hash:
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cd v2
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cargo run -q -p wifi-densepose-train --bin aa_score_runner --no-default-features -- --repeat 16
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# → {"repeatability":{"runs":16,"unique_proof_hashes":1,"repeatable":true,...}}
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# Real model scoring (score predictions against an eval split):
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cargo run -q -p wifi-densepose-train --bin aa_score_runner --no-default-features -- \
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--split ../aether-arena/fixtures/smoke_split.json \
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--pred ../aether-arena/fixtures/smoke_pred.json --json
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# Verify the witness ledger chain is intact (tamper-evident):
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cd ../aether-arena/ledger && python3 ledger_tools.py verify
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# → "OK: N rows, chain intact" (edit any row and it reports the broken link)
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```
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The expected hash is committed at [`fixtures/expected_score.sha256`](fixtures/expected_score.sha256). Same harness version + same fixture → same hash on glibc / MSVC / Apple. If your local run prints `VERDICT: PASS`, you have reproduced the scorer.
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### What happens if the scoring maths changes
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Any edit to `ruview_metrics.rs`, `ablation.rs`, or `aa_score_runner.rs` moves the hash and **fails the CI gate** (`.github/workflows/aether-arena-harness.yml`) until the maintainer regenerates and reviews:
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```bash
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cargo run -p wifi-densepose-train --bin aa_score_runner --no-default-features -- --generate-hash \
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> aether-arena/fixtures/expected_score.sha256
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```
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So a scorer change is always a reviewed, public diff — never silent. That's `harness_version` pinning + `determinism_gate` in action (ADR-149 §2.4–§2.5).
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## The five-step acceptance test (v0 launch gate)
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A stranger must be able to:
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1. **Submit** a model (artifact + `schema/aa-submission.toml`) with no insider help.
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2. **Get a deterministic score** — same model + same `harness_version` → same numbers.
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3. **See the signed row** appended to the public results ledger.
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4. **Rerun the scorer locally** on the public smoke split and reproduce the logic (the command above).
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5. **Understand why the rank is fair** — private split, open scorer, pinned version, proof hash — from these docs alone.
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If any step fails, v0 is not ready.
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## Current status
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- ✅ Step 4 (rerun the open scorer locally, reproduce the hash) — **works today** via `aa_score_runner`.
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- ✅ CI harness gate runs the scorer on every PR.
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- ⏳ Steps 1–3, 5 (HF Space submission flow + signed ledger) — in progress; require the HF Space deploy (needs an HF token / maintainer authorization).
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