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language: tr |
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# Turkish Language Models with Huggingface's Transformers |
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As R&D Team at Loodos, we release cased and uncased versions of most recent language models for Turkish. More details about pretrained models and evaluations on downstream tasks can be found [here (our repo)](https://github.com/Loodos/turkish-language-models). |
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# Turkish ALBERT-Base (uncased) |
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This is ALBERT-Base model which has 12 repeated encoder layers with 768 hidden layer size trained on uncased Turkish dataset. |
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## Usage |
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Using AutoModel and AutoTokenizer from Transformers, you can import the model as described below. |
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```python |
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from transformers import AutoModel, AutoTokenizer |
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tokenizer = AutoTokenizer.from_pretrained("loodos/albert-base-turkish-uncased", do_lower_case=False, keep_accents=True) |
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model = AutoModel.from_pretrained("loodos/albert-base-turkish-uncased") |
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normalizer = TextNormalization() |
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normalized_text = normalizer.normalize(text, do_lower_case=True, is_turkish=True) |
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tokenizer.tokenize(normalized_text) |
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``` |
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### Notes on Tokenizers |
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Currently, Huggingface's tokenizers (which were written in Python) have a bug concerning letters "ı, i, I, İ" and non-ASCII Turkish specific letters. There are two reasons. |
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1- Vocabulary and sentence piece model is created with NFC/NFKC normalization but tokenizer uses NFD/NFKD. NFD/NFKD normalization changes text that contains Turkish characters I-ı, İ-i, Ç-ç, Ö-ö, Ş-ş, Ğ-ğ, Ü-ü. This causes wrong tokenization, wrong training and loss of information. Some tokens are never trained.(like "şanlıurfa", "öğün", "çocuk" etc.) NFD/NFKD normalization is not proper for Turkish. |
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2- Python's default ```string.lower()``` and ```string.upper()``` make the conversions |
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- "I" and "İ" to 'i' |
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- 'i' and 'ı' to 'I' |
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respectively. However, in Turkish, 'I' and 'İ' are two different letters. |
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We opened an [issue](https://github.com/huggingface/transformers/issues/6680) in Huggingface's github repo about this bug. Until it is fixed, in case you want to train your model with uncased data, we provide a simple text normalization module (`TextNormalization()` in the code snippet above) in our [repo](https://github.com/Loodos/turkish-language-models). |
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## Details and Contact |
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You contact us to ask a question, open an issue or give feedback via our github [repo](https://github.com/Loodos/turkish-language-models). |
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## Acknowledgments |
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Many thanks to TFRC Team for providing us cloud TPUs on Tensorflow Research Cloud to train our models. |
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