CamemBERTv2 is a French language model pretrained on a large corpus of 275B tokens of French text. It is the second version of the CamemBERT model, which is based on the RoBERTa architecture. CamemBERTv2 is trained using the Masked Language Modeling (MLM) objective with 40% mask rate for 3 epochs on 32 H100 GPUs. The dataset used for training is a combination of French OSCAR dumps from the CulturaX Project, French scientific documents from HALvest, and the French Wikipedia.

The model is a drop-in replacement for the original CamemBERT model. Note that the new tokenizer is different from the original CamemBERT tokenizer, so you will need to use Fast Tokenizers to use the model. It will work with CamemBERTTokenizerFast from transformers library even if the original CamemBERTTokenizer was sentencepiece-based.

Check the CamemBERTav2 model, a much stronger French language model, based on DeBERTaV3, here.

Model update details

The new update includes:

Much larger pretraining dataset: 275B unique tokens (previously ~32B)
A newly built tokenizer based on WordPiece with 32,768 tokens, addition of the newline and tab characters, support emojis, and better handling of numbers (numbers are split into two digits tokens)
Extended context window of 1024 tokens

More details are available in the CamemBERTv2 paper.

How to use

python

from transformers import AutoTokenizer, AutoModel, AutoModelForMaskedLM

camembertv2 = AutoModelForMaskedLM.from_pretrained("almanach/camembertv2-base")
tokenizer = AutoTokenizer.from_pretrained("almanach/camembertv2-base")

Fine-tuning Results:

Datasets: POS tagging and Dependency Parsing (GSD, Rhapsodie, Sequoia, FSMB), NER (FTB), the FLUE benchmark (XNLI, CLS, PAWS-X), the French Question Answering Dataset (FQuAD), Social Media NER (Counter-NER), and Medical NER (CAS1, CAS2, E3C, EMEA, MEDLINE).

Model	UPOS	LAS	FTB-NER	CLS	PAWS-X	XNLI	F1 (FQuAD)	EM (FQuAD)	Counter-NER	Medical-NER
CamemBERT	97.59	88.69	89.97	94.62	91.36	81.95	80.98	62.51	84.18	70.96
CamemBERTa	97.57	88.55	90.33	94.92	91.67	82.00	81.15	62.01	87.37	71.86
CamemBERT-bio	-	-	-	-	-	-	-	-	-	73.96
CamemBERTv2	97.66	88.64	91.99	95.07	92.00	81.75	80.98	61.35	87.46	72.77
CamemBERTav2	97.71	88.65	93.40	95.63	93.06	84.82	83.04	64.29	89.53	73.98

Finetuned models are available in the following collection: CamemBERTv2 Finetuned Models

Pretraining Codebase

We use the pretraining codebase from the CamemBERTa repository for all v2 models.

Citation

bibtex

@misc{antoun2024camembert20smarterfrench,
      title={CamemBERT 2.0: A Smarter French Language Model Aged to Perfection},
      author={Wissam Antoun and Francis Kulumba and Rian Touchent and Éric de la Clergerie and Benoît Sagot and Djamé Seddah},
      year={2024},
      eprint={2411.08868},
      archivePrefix={arXiv},
      primaryClass={cs.CL},
      url={https://arxiv.org/abs/2411.08868},
}