A Tasty French Language Model

Facebook AI Research




CamemBERT is a state-of-the-art language model for French based on the RoBERTa architecture pretrained on the French subcorpus of the newly available multilingual corpus OSCAR.

We evaluate CamemBERT in four different downstream tasks for French: part-of-speech (POS) tagging, dependency parsing, named entity recognition (NER) and natural language inference (NLI); improving the state of the art for most tasks over previous monolingual and multilingual approaches, which confirms the effectiveness of large pretrained language models for French.

CamemBERT was trained and evaluated by Louis Martin, Benjamin Muller, Pedro Javier Ortiz Suárez, Yoann Dupont, Laurent Romary, Éric Villemonte de la Clergerie, Djamé Seddah and Benoît Sagot.


Pretrained model

Model #params vocab size Download
CamemBERT 110M 32k camembert.v0.tar.gz

Example usage

Load CamemBERT from torch.hub (PyTorch >= 1.1):
import torch
camembert = torch.hub.load('pytorch/fairseq', 'camembert.v0')
camembert.eval()  # disable dropout (or leave in train mode to finetune)
Load CamemBERT (for PyTorch 1.0 or custom models):
# Download camembert model
wget https://dl.fbaipublicfiles.com/fairseq/models/camembert.v0.tar.gz
tar -xzvf camembert.v0.tar.gz

# Load the model in fairseq
from fairseq.models.roberta import CamembertModel
camembert = CamembertModel.from_pretrained('/path/to/camembert.v0')
camembert.eval()  # disable dropout (or leave in train mode to finetune)
Filling masks:
masked_line = 'Le camembert est <mask> :)'
camembert.fill_mask(masked_line, topk=5)
# [('Le camembert est délicieux :)', 0.4909118115901947, ' délicieux'),
#  ('Le camembert est excellent :)', 0.10556942224502563, ' excellent'),
#  ('Le camembert est succulent :)', 0.03453322499990463, ' succulent')]
Extract features from Camembert:
# Extract the last layer's features
line = "J'aime le camembert!"
tokens = camembert.encode(line)
last_layer_features = camembert.extract_features(tokens)
assert last_layer_features.size() == torch.Size([1, 10, 768])

# Extract all layer's features (layer 0 is the embedding layer)
all_layers = camembert.extract_features(tokens, return_all_hiddens=True)
assert len(all_layers) == 13
assert torch.all(all_layers[-1] == last_layer_features)