| --- |
| language: grc |
| license: gpl-3.0 |
| datasets: |
| - Macronizer/oga-macronized |
| tags: |
| - ancient-greek |
| - vowel-length |
| - macronization |
| - token-classification |
| - char-level |
| --- |
| |
| # grc-macronizer-char: a small char-level model for Ancient Greek vowel-length annotation |
|
|
| This model predicts the phonemic length (long/short/undetermined) of the three |
| Ancient Greek "dichrona" -- alpha (α), iota (ι), and upsilon (υ) -- whose length |
| is not disambiguated by the standard Greek script. It was trained on Ancient |
| Greek text automatically macronized by the rule-based grc-macronizer, applied to the |
| [Opera Graeca Adnotata](https://doi.org/10.5281/zenodo.14206061) corpus |
| (Celano 2024), and is intended as a complementary, corpus-general alternative |
| to that rule-based system. |
|
|
| ## Architecture |
|
|
| A small transformer encoder (~0.9M parameters) operating over three character-level |
| "planes" per input position: |
|
|
| - **plane 1 (letter)**: which of the 24 Greek letters (final/medial sigma |
| folded together), or space, or "other" (punctuation/digits/foreign chars) |
| - **plane 2 (diacritic)**: the combination of accent/breathing/diaeresis marks |
| on that letter, if any (a small vocabulary fit from the training data) |
| - **target (macron)**: none / short / long -- predicted only at positions |
| that are genuine ambiguous dichrona (diphthong members and circumflexed |
| vowels are excluded, matching the rule-based system's own definition) |
|
|
| During training, the diacritic plane is randomly masked (accents stripped) |
| for a fraction of characters, so the model also learns to macronize |
| unaccented input. |
|
|
| ## Usage |
|
|
| ```python |
| import sys |
| sys.path.insert(0, "path/to/grc-macronizer/macron_model") # for predict.py |
| from predict import MacronPredictor |
| |
| predictor = MacronPredictor("path/to/downloaded/checkpoint") |
| macronized = predictor.macronize("ανθρωπος ανηρ") |
| # -> "α^νθρωπος α_νηρ" |
| ``` |
|
|
| `MacronPredictor` expects the checkpoint directory (containing |
| `config.json`/`model.safetensors`) plus a sibling or parent `diacritic_vocab.json` |
| (see `predict.py` for the exact lookup logic). The `predict.py`/`tokenizer.py` |
| source lives in [grc-macronizer/macron_model](https://anonymous.4open.science/r/grc-macronizer-68DC/macron_model/). |
|
|
