secryst — Python crystal

Secryst is coined from scrying + crystal: gazing into an opaque script to reveal its hidden reading. This package is the Python crystal.

The Python crystal — reference implementation of IMF v1 model zips and the models.yaml index (the interscript-ml contract), the phonological layer of Interscript. The Ruby (secryst gem) and TypeScript (npm i secryst) crystals are diffed against this one on shared golden sets. This crystal owns golden generation and numerical adjudication for the family.

Home repo: https://github.com/secryst/secryst-py (this copy in ml-models/runtime is the frozen origin; the package now lives there).

from secryst import Model

model = Model.load("khm-latn-1.0")        # id: index resolve -> download
                                          # -> sha256-verify -> cache -> load
model.translate("ភាសា")                   # -> "pheasaea"
model.id                                   # "khm-latn-1.0"

model = Model.load("khm-latn-1.0.zip")    # or: a local zip path directly

Byte-level only: the canonical ByT5 table (byte b → id b+3, trailing EOS) — no vocab files, no per-model tokenization code.
Greedy KV-cache decode when the zip ships decoder-kv.onnx (default), plain full-recompute fallback otherwise.
Every .onnx member is sha256-verified against metadata.yaml before the session is created; corrupt downloads fail loudly.
Dynamic fetch per the models.yaml contract (shared with the Ruby and TypeScript runtimes): resolve id -> channel URL, download to temp, verify whole-file sha256 against the index, atomically install into ~/.cache/secryst/models/<id>/. Overrides: SECRYST_INDEX (URL or path), SECRYST_CACHE.

Install: pip install secryst (or pip install -e ".[dev]" from the repo).

Tests: python -m pytest runtime/tests — tiny-graph zips, no torch needed. The end-to-end golden test runs when SECRYST_E2E_ZIP points at a real zip (e.g. models/khm-latn/khm-latn-1.0-fp32.zip) and asserts byte-identical outputs against golden/khm-latn-100.jsonl.

License: BSD-3-Clause.

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