LucasF/sentence-camembert-base

Pre-trained sentence embedding models are the state-of-the-art of Sentence Embeddings for French.

This model is improved from dangvantuan/sentence-camembert-base using fine-tuning with Augmented SBERT on dataset stsb along with Pair Sampling Strategies through 2 models CrossEncoder-camembert-large and dangvantuan/sentence-camembert-large

Usage

The model can be used directly (without a language model) as follows:

from sentence_transformers import SentenceTransformer
model =  SentenceTransformer("Lajavaness/sentence-camembert-base")

sentences = ["Un avion est en train de décoller.",
          "Un homme joue d'une grande flûte.",
          "Un homme étale du fromage râpé sur une pizza.",
          "Une personne jette un chat au plafond.",
          "Une personne est en train de plier un morceau de papier.",
          ]

embeddings = model.encode(sentences)

Evaluation

The model can be evaluated as follows on the French test data of stsb.

from sentence_transformers import SentenceTransformer
from sentence_transformers.readers import InputExample
from sentence_transformers.evaluation import EmbeddingSimilarityEvaluator
from datasets import load_dataset
def convert_dataset(dataset):
    dataset_samples=[]
    for df in dataset:
        score = float(df['similarity_score'])/5.0  # Normalize score to range 0 ... 1
        inp_example = InputExample(texts=[df['sentence1'], 
                                    df['sentence2']], label=score)
        dataset_samples.append(inp_example)
    return dataset_samples

# Loading the dataset for evaluation
df_dev = load_dataset("stsb_multi_mt", name="fr", split="dev")
df_test = load_dataset("stsb_multi_mt", name="fr", split="test")

# Convert the dataset for evaluation

# For Dev set:
dev_samples = convert_dataset(df_dev)
val_evaluator = EmbeddingSimilarityEvaluator.from_input_examples(dev_samples, name='sts-dev')
val_evaluator(model, output_path="./")

# For Test set:
test_samples = convert_dataset(df_test)
test_evaluator = EmbeddingSimilarityEvaluator.from_input_examples(test_samples, name='sts-test')
test_evaluator(model, output_path="./")

Test Result: The performance is measured using Pearson and Spearman correlation on the sts-benchmark:

• On dev

Model	Pearson correlation	Spearman correlation	#params
Lajavaness/sentence-camembert-base	86.88	86.73	110M
dangvantuan/sentence-camembert-base	86.73	86.54	110M
inokufu/flaubert-base-uncased-xnli-sts	85.85	85.71	137M
distiluse-base-multilingual-cased	79.22	79.16	135M

• On test: Pearson and Spearman correlation are evaluated on many different benchmarks dataset:

Pearson score

Model	STS-B	STS12-fr	STS13-fr	STS14-fr	STS15-fr	STS16-fr	SICK-fr	params
Lajavaness/sentence-camembert-base	83.46	84.49	84.61	83.94	86.94	75.20	82.86	110M
inokufu/flaubert-base-uncased-xnli-sts	82.82	84.79	85.76	82.81	85.38	74.05	82.23	137M
dangvantuan/sentence-camembert-base	82.36	82.06	84.08	81.51	85.54	73.97	80.91	110M
sentence-transformers/distiluse-base-multilingual-cased-v2	78.63	72.51	67.25	70.12	79.93	66.67	77.76	135M
hugorosen/flaubert_base_uncased-xnli-sts	78.38	79.00	77.61	76.56	79.03	71.22	80.58	137M
antoinelouis/biencoder-camembert-base-mmarcoFR	76.97	71.43	73.50	70.56	78.44	71.23	77.62	110M

Spearman score

Model	STS-B	STS12-fr	STS13-fr	STS14-fr	STS15-fr	STS16-fr	SICK-fr	params
Lajavaness/sentence-camembert-base	82.92	77.71	84.19	81.83	87.04	76.81	76.36	110M
inokufu/flaubert-base-uncased-xnli-sts	83.07	77.34	85.88	80.96	85.70	76.43	77.00	137M
dangvantuan/sentence-camembert-base	81.64	75.45	83.86	78.63	85.66	75.36	74.18	110M
sentence-transformers/distiluse-base-multilingual-cased-v2	77.49	69.80	68.85	68.17	80.27	70.04	72.49	135M
hugorosen/flaubert_base_uncased-xnli-sts	76.93	68.96	77.62	71.87	79.33	72.86	73.91	137M
antoinelouis/biencoder-camembert-base-mmarcoFR	75.55	66.89	73.90	67.14	78.78	72.64	72.03	110M

Citation

@article{reimers2019sentence,
   title={Sentence-BERT: Sentence Embeddings using Siamese BERT-Networks},
   author={Nils Reimers, Iryna Gurevych},
   journal={https://arxiv.org/abs/1908.10084},
   year={2019}
}


@article{martin2020camembert,
   title={CamemBERT: a Tasty French Language Mode},
   author={Martin, Louis and Muller, Benjamin and Su{\'a}rez, Pedro Javier Ortiz and Dupont, Yoann and Romary, Laurent and de la Clergerie, {\'E}ric Villemonte and Seddah, Djam{\'e} and Sagot, Beno{\^\i}t},
   journal={Proceedings of the 58th Annual Meeting of the Association for Computational Linguistics},
   year={2020}
}
@article{thakur2020augmented,
  title={Augmented SBERT: Data Augmentation Method for Improving Bi-Encoders for Pairwise Sentence Scoring Tasks},
  author={Thakur, Nandan and Reimers, Nils and Daxenberger, Johannes and Gurevych, Iryna},
  journal={arXiv e-prints},
  pages={arXiv--2010},
  year={2020}