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Bohdan Didenko

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Data-Efficient Adaptation of Multilingual LLMs to Ukrainian

This work combines vocabulary surgery for tokenizer adaptation without full retraining, cross-lingual transfer of quality classifiers via translation, enabling filtering without target-language annotations, and generation of instruction data through translation, task conversion, and targeted synthesis.

Yurii Paniv, Bohdan Didenko, Mykola Haltiuk et al. · 3 citations
Preprint Aug 2026

Writing-System-Level Tokenizer Adaptation for Byte-Level BPE

Pretrained byte-level BPE tokenizers can segment underrepresented languages inefficiently. Replacing a tokenizer changes the meaning of nearly every token ID, while vocabulary expansion enlarges the model's embedding and output matrices. We study post-hoc adaptation that keeps the model-vocabulary size fixed and preser...

Bohdan Didenko · 1 citation

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