README.md

metadata

language:
  - grc
license: other
task_categories:
  - text-generation
  - token-classification
tags:
  - ancient-greek
  - vowel-length
  - macronization
  - classics
pretty_name: OGA Macronized (Ancient Greek Vowel Length)
size_categories:
  - 1M<n<10M

OGA Macronized

Automatically macronized Ancient Greek text: the phonemic length of the three "dichrona" (ambiguous-length letters) — alpha (α), iota (ι), upsilon (υ) — has been marked wherever the grc-macronizer rule-based system could disambiguate it with confidence. A trailing ^ marks a short dichronon, a trailing _ marks a long one; dichrona the macronizer could not resolve are left unmarked (never guessed).

Source

Text is the Opera Graeca Adnotata corpus (Celano 2024) — ~40M tokens of Ancient Greek aggregating First1KGreek, the Patristic Text Archive, and Perseus' canonical-greekLit, with lemma/POS/ morphology already annotated by Celano's own parser. That existing annotation was converted directly into the macronizer's internal representation (bypassing any separate NLP pipeline) and run through the rule-based macronizer.

• 2,234,599 sentences
• Overall dichrona-in-open-syllables macronization ratio: 69.20% (11,627,591 / 16,802,080 disambiguated)

Fields

• macronized: the sentence with ^/_ markup, e.g. χρὴ γι^νώσκειν ὅτι^ πά_σης τῆς γῆς
• plain: the same sentence with markup stripped (i.e. ordinary Greek orthography)

Intended use

Training data for sequence models that predict Ancient Greek vowel length (e.g. a char-level tagger), and as an intermediate resource for downstream prosody-aware NLP (verse scansion, metrical classification, morphology disambiguation of the dichrona-bearing minimal pairs like ἄν/ἂν).

Note: labels are silver, not gold — they come from a rule-based system that is deliberately conservative (does not guess), not from human annotation. For gold-standard evaluation, see Norma Syllabarum Graecarum.

License

The underlying OGA corpus is distributed by its authors under the terms shown on its Zenodo record; check that record for the authoritative license before redistribution. The macronization itself is produced by software licensed under GNU GPL v3 (grc-macronizer).

Citation

Giuseppe G. A. Celano. Opera Graeca Adnotata: Building a 34M+ Token Multilayer Corpus for Ancient Greek. arXiv:2404.00739.

Thörn Cleland, Albin and Eric Cullhed (forthcoming). Automatic Annotation of Ancient Greek Vowel Length.