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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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| README.md | ||
| test256.bin | ||
JPEG AI reference codestream
test256.bin (367 bytes, SHA-256
99840e5f472423f5a1261c9ec219d12dc910e9623d752672555dfea69ea4a097) is the output
of the ISO/IEC 6048-1 reference software's encoder (BSD-3) at its default operating
point, for a 256×256 synthetic RGB test image (gradients and blocks). Segment layout:
PIH 49 bytes, TON 63, RDI 1, SORP 97, SORS 47, SOZ 83.
It is the one configuration wai::jpegai_decode implements, so the unit tests in
src/jpegai_decode.rs use it to check the decoder's scope guard: the unmodified
codestream is accepted, and copies with a single header field changed
(beta_displacement_log, model_id, the colour transform, an LSBS flag) are refused.
Decoding it to pixels needs the sink-supplied weight bundle, which is not committed;
see tests/jpegai_e2e_full.rs.