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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.
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