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license: cc-by-sa-4.0 |
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# Greek-Lesbian Morphosyntactic Model (Stanza + Greek BERT) |
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This repository hosts a morphosyntactic model trained using [Stanza](https://stanfordnlp.github.io/stanza/) and fine-tuned with [Greek BERT](https://huggingface.co/nlpaueb/bert-base-greek-uncased-v1) for the **Lesbian dialect of Greek** (spoken on the island of Lesbos). The model has been trained and evaluated on a small, curated treebank of 540 sentences (500 for training, 30 for testing, 10 for development). |
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The model aims to support part-of-speech tagging, morphological analysis, and dependency parsing for dialectal Greek and is part of a broader effort to document and process regional language varieties. |
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## 📚 Dataset |
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The treebank is a manually annotated resource compiled from both **oral** and **written** sources. Oral data were collected between 2023 and 2024 from speakers in various villages of Lesbos: |
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* **Agra** (Male speaker) |
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* **Chidira** (Female speaker) |
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* **Eressos** (Male speaker) |
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* **Pterounta** (Female speaker) |
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* **Mesotopos** (Male speaker) |
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* **Parakoila** (Female speaker) |
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Written sources include: |
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* Papanis, D. & Papanis, G. D. (2004). *Lexiko tou Agiasotikou Glosikou Idiomatos* |
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* Tsokarou-Mitsioni, E. (1998). *Palies Istories ap' tn Agiasiou* |
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* Tsokarou-Mitsioni, E. (2019). *Prosfygiá* |
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* Anagnostopoulou, M. A. (2021). *Thematiko Lexiko tis Lesviakis Dialektou* |
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* Anagnostou, V. T. (2014). *Tsi sta th'ka mas: Komodia sta k'stariot'ka* |
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The full treebank is openly available here: |
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🔗 [UD\_Greek-Lesbian on GitHub](https://github.com/UniversalDependencies/UD_Greek-Lesbian) |
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## 🧠 Model Architecture |
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* **Base pipeline**: Stanza (v1.7.0+) |
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* **Pretrained LM**: [Greek BERT](https://huggingface.co/nlpaueb/bert-base-greek-uncased-v1) |
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* **Tasks**: Tokenization, Lemmatization, POS tagging, Morphological features, Dependency parsing |
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* **Fine-tuning**: Conducted on the UD\_Greek-Lesbian treebank |
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## 📈 Performance |
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Due to the limited size of the training data, the model should be considered **experimental**. It is optimized for research purposes and performs best on dialectal content similar to the training sources. Further fine-tuning and larger datasets will be necessary for production use. |
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## 📄 Citation |
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If you use this model or the accompanying treebank, please cite: |
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> Bompolas, S., Markantonatou, S., Ralli, A., & Anastasopoulos, A. (2025). *Crossing Dialectal Boundaries: Building a Treebank for the Dialect of Lesbos through Knowledge Transfer from Standard Modern Greek*. In Proceedings of the 8th Universal Dependencies Workshop (UDW, SyntaxFest 2025). Association for Computational Linguistics. |
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## 🔗 Related Resources |
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* [Universal Dependencies (UD)](https://universaldependencies.org/) |
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* [Stanza Documentation](https://stanfordnlp.github.io/stanza/) |
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* [Greek BERT on Hugging Face](https://huggingface.co/nlpaueb/bert-base-greek-uncased-v1) |
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