README.md

metadata

language:
  - grc
license: gpl-3.0
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.

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.