non-canonical-tokenization

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Language Models are not Equally Robust to Non-Canonical Tokenization across Languages

arXiv cs.CL ↗ · 2026-07-30 Cached

This paper investigates whether language models remain robust to alternative (non-canonical) tokenizations across 27 languages, finding that invariance observed in English does not generalize and that languages with higher token fragmentation show greater sensitivity. The authors demonstrate that LoRA fine-tuning with multi-tokenization data can mitigate this sensitivity.

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