arXiv AI By Elio Musacchio, Lucia Siciliani, Pierpaolo Basile

Mimir: Large-scale Multilingual Concept Modeling

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arXiv Computation and Language
Sep 15

To Each Language Its Tokenizer: Modular Tokenizers for Efficient Multilingual LLMs

The paper proposes a modular tokenizer framework for multilingual large language models, allowing the creation of language‑specific subtokenizers that match monolingual compression quality. It introduces a pretraining strategy that samples these subtokenizers to limit predictions to relevant vocabularies, enabling efficient training and inference. This approach reduces memory usage and speeds up inference without compromising performance.

By Franck Signe, Hippolyte Pilchen, Fran\c{c}ois Yvon, \'Edouard Grave
arXiv AI
Oct 27

Conceptizer: Next-Token Prediction Is Not All You Need

Conceptizer is a training framework that augments next-token prediction with a reward for meaning by using a fixed vocabulary of about 9,000 concepts derived from contextual synonyms. It maps each token distribution to a concept distribution, sharing the reward for the target meaning across its possible wordings, thereby providing a concept-level training signal without adding model parameters. Applied to 1B–8B parameter models, Conceptizer achieves lower perplexity at concept-target positions, assigns higher probability to contextual synonyms, and improves downstream performance on knowledge and sentiment tasks while remaining comparable on commonsense tasks.

By Haoran Zheng, Chen Shani