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Greek letter classifier weights letterclass-v1

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@ChaseHendrick ChaseHendrick released this 24 Oct 16:14
letterclass-v1
70b2c16

Weights for letterclass, the Greek capital letter classifier and line reader in scripts/letters/ (tool page). Fetch them with python scripts/letters/reader_api.py fetch, which checks each file against scripts/letters/letterclass-weights.json.

  • Three ConvNeXt runs (cb128 convnext_base, cs128s0 and cs128s1 convnext_small, 128 px), trained on Hell-Char's letter crops only (github.com/ipavlopoulos/diachronic-greek-letterforms at aeef8466, CC BY 4.0) from timm's ImageNet weights (Apache-2.0). No ICDAR 2023 image and no scroll data in training. License: CC BY 4.0.
  • letterclass-v1-greek-prose-lm5.json.gz: a Kneser-Ney order-5 letter model of 22 Perseus prose texts (PerseusDL/canonical-greekLit at 0189b9c8), with Homer, poets, verse and quotations left out. License: CC BY-SA 4.0.

In a preregistered head-to-head on the ICDAR 2023 test answers (Zenodo 13825619; 8,479 letters, boxes given), letter error was 0.291 against 0.340 for Hell-Char ConvNeXt-V2. These are photographs of papyri, not ink maps. Every read is model output, not a reading.

Assets 9
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