license: other
license_name: bsd-3-clause-with-data-dependency
license_link: >-
https://github.com/interscript/interscript-models/blob/main/cards/urd-diac-base-1.0.md
language:
- ur
tags:
- diacritization
- byt5
- imf
- urdu
metrics:
- cer
urd-diac-base-1.0
Urdu diacritization, base tier (run-066): byt5-base seq2seq on the full 573,130-pair urdu-diacrit corpus. IMF v1 fp16.
Metrics (full 11,940-row test split, raw char CER, row-mean)
CER 3.57 (urd-diac-1.0 small tier: 3.77 baseline) — gate PASSED. Word accuracy 69.8%.
Artifact parity (WO51 contract)
Single-row greedy decode, the runtime's actual decode mode: ONNX artifact CER 3.64 — identical to torch on 500/500 rows (agreement 1.0; three-way bf16/fp32/ORT agreement 1.0). Batched decode without an attention mask is outside the artifact contract (CONFORMANCE.md).
Conformance
The shipped runtime reproduces all 12 frozen vectors byte-exactly
(conformance/urd-diac-base-vectors.json).
Data / license
Weights depend on the original training-data license (the urdu-diacrit
corpus; provenance in corpora/PROVENANCE.md, owner-approved ship
decision 2026-10-18). Code and weights: BSD-3-Clause.