wai: state what each determinism tier guarantees, and make replicate mean it #103

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dcharlot merged 2 commits from wai/land-02-determinism-tiers into main 2026-09-30 19:50:37 -04:00

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2026-09-29

Transaction Science

Merge feat/wai-video-workflow into wai/land-02-determinism-tiers ...

Brings in, through the refreshed previous link, main's OER differential fuzzer (54e89b56) and its audit of the OER extension against both verifiers (860ead8c, documentation only), so this link is checked against current main.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

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2026-09-29 10:10:29 -04:00

2026-09-28

Transaction Science

wai: state what each determinism tier guarantees, and make replicate mean it ...

SPEC §7 required an integer decode for `intent = replicate` in one paragraph
and accepted entropy-consistency in another. Resolved in one direction:

- Over a neural capability, `replicate` promises `decode-equivalence` — the
  whole decode to the final medium reproduces on every conforming sink.
  `entropy-consistency` (the decoded symbols reproduce; later stages may not)
  no longer backs it. The tier is a property of the capability as registered,
  not of one implementation.
- Over a standard codec, `replicate` promises that standard's decoder
  conformance, stated per registry class. `StandardTolerance` covers codecs
  whose standard holds decoders to a criterion around a reference;
  `StandardUnclassified` covers codecs not yet classified.
- `wai.image.jpegai` moves to the new `NeuralEntropyExact` class: its
  entropy decode is integer and exact, its later stages are float. It no longer
  backs `replicate`. This is recorded as a conservative choice pending a
  reading of ISO/IEC 6048-4, not as a finding about that standard.
- The JPEG AI decoders now refuse codestreams outside the configuration they
  implement (other β, model_id, colour transform or LSBS settings) instead of
  decoding them incorrectly, and detect flush-to-zero and round-toward-zero
  float environments.
- `wai wrap` writes `replicate` only over capabilities, and fallbacks, whose
  class a sink accepts unpinned.
- extensions/determinism-tiers.md gains an evidence table stating which
  platforms and CI jobs have exercised each guarantee, including what has not
  run.
- CI: a neural-gates workflow runs the model-free gates, including
  decode_envelope_strict, in an Ubuntu 24.04 image where the `neural` build
  links.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

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2026-09-28 18:25:52 -04:00