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mmBERT: A Modern Multilingual Encoder with Annealed Language Learning

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arxiv 2509.06888 v1 pith:C6W5OZB6 submitted 2025-09-08 cs.CL cs.IRcs.LG

mmBERT: A Modern Multilingual Encoder with Annealed Language Learning

classification cs.CL cs.IRcs.LG
keywords languagesmodelsmmbertclassificationincludinglow-resourcemultilingualdata
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Encoder-only languages models are frequently used for a variety of standard machine learning tasks, including classification and retrieval. However, there has been a lack of recent research for encoder models, especially with respect to multilingual models. We introduce mmBERT, an encoder-only language model pretrained on 3T tokens of multilingual text in over 1800 languages. To build mmBERT we introduce several novel elements, including an inverse mask ratio schedule and an inverse temperature sampling ratio. We add over 1700 low-resource languages to the data mix only during the decay phase, showing that it boosts performance dramatically and maximizes the gains from the relatively small amount of training data. Despite only including these low-resource languages in the short decay phase we achieve similar classification performance to models like OpenAI's o3 and Google's Gemini 2.5 Pro. Overall, we show that mmBERT significantly outperforms the previous generation of models on classification and retrieval tasks -- on both high and low-resource languages.

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Forward citations

Cited by 14 Pith papers

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