README.md

metadata

language:
  - bn
license: cc-by-4.0
task_categories:
  - image-to-text
tags:
  - ocr
  - bangla
  - bengali
  - handwriting
  - benchmark
  - robustness
pretty_name: Bangla OCR Double Benchmark
configs:
  - config_name: default
    data_files:
      - split: bongabdo
        path: data/bongabdo-*.parquet
      - split: bn_htrd
        path: data/bn_htrd-*.parquet

Bangla OCR Double Benchmark

Two equally weighted, deterministic full-page Bangla handwriting robustness splits:

• bongabdo: 6,669 readability-preserving renderings balanced over all 111 Bongabdo pages.
• bn_htrd: 6,669 renderings balanced over all 75 actual files in the writer-separated BN-HTRd test split.

These are explicitly compositional/augmentation robustness rows, not 13,338 independent writers or source documents. Every row exposes its source page ID, source SHA-256, rendered-image SHA-256, and complete deterministic transform receipt. No row changes, obscures, or synthesizes the reference text.

Metrics

Each split uses corpus-level Unicode-NFC Bangla WER and CER:

split score = 50% WER + 50% CER

Overall = 50% Bongabdo score + 50% BN-HTRd score

Lower is better. This release intentionally has no S3 semantic-importance instrument.

Provenance

• Bongabdo: 111 pages from 49 contributors, CC BY 4.0.
• BN-HTRd: original recognition ground truths joined to the 75 physical test images, CC BY 4.0.

The source archives and final manifests are pinned in receipt.json and the manifest files.