redis/langcache-embed-v3

Redis fine-tuned BiEncoder model for semantic caching on LangCache

This is a sentence-transformers model finetuned from Alibaba-NLP/gte-modernbert-base on the LangCache Sentence Pairs (all) dataset. It maps sentences & paragraphs to a 768-dimensional dense vector space and can be used for sentence pair similarity.

Model Details

Model Description

• Model Type: Sentence Transformer
• Base model: Alibaba-NLP/gte-modernbert-base
• Maximum Sequence Length: 8192 tokens
• Output Dimensionality: 768 dimensions
• Similarity Function: Cosine Similarity
• Training Dataset:
  • LangCache Sentence Pairs (all)
• Language: en
• License: apache-2.0

Model Sources

• Documentation: Sentence Transformers Documentation
• Repository: Sentence Transformers on GitHub
• Hugging Face: Sentence Transformers on Hugging Face

Full Model Architecture

SentenceTransformer(
  (0): Transformer({'max_seq_length': 8192, 'do_lower_case': False, 'architecture': 'ModernBertModel'})
  (1): Pooling({'word_embedding_dimension': 768, 'pooling_mode_cls_token': True, 'pooling_mode_mean_tokens': False, 'pooling_mode_max_tokens': False, 'pooling_mode_mean_sqrt_len_tokens': False, 'pooling_mode_weightedmean_tokens': False, 'pooling_mode_lasttoken': False, 'include_prompt': True})
)

Usage

Direct Usage (Sentence Transformers)

First install the Sentence Transformers library:

pip install -U sentence-transformers

Then you can load this model and run inference.

from sentence_transformers import SentenceTransformer

# Download from the 🤗 Hub
model = SentenceTransformer("redis/langcache-embed-v3")
# Run inference
sentences = [
    'He was a close friend of Ángel Cabrera and is a cousin of golfer Tony Croatto .',
    'He was a close friend of Ángel Cabrera , and is a cousin of golfer Tony Croatto .',
    'UWIRE also distributes its members content to professional media outlets , including Yahoo , CNN and CBS News .',
]
embeddings = model.encode(sentences)
print(embeddings.shape)
# [3, 768]

# Get the similarity scores for the embeddings
similarities = model.similarity(embeddings, embeddings)
print(similarities)
# tensor([[0.9922, 0.9922, 0.5352],
#         [0.9922, 0.9961, 0.5391],
#         [0.5352, 0.5391, 1.0000]], dtype=torch.bfloat16)

Evaluation

Metrics

Binary Classification

• Dataset: test
• Evaluated with BinaryClassificationEvaluator

Metric	Value
cosine_accuracy	0.7038
cosine_accuracy_threshold	0.8524
cosine_f1	0.7122
cosine_f1_threshold	0.8119
cosine_precision	0.5989
cosine_recall	0.8784
cosine_ap	0.6477
cosine_mcc	0.4418

Training Details

Training Dataset

LangCache Sentence Pairs (all)

• Dataset: LangCache Sentence Pairs (all)
• Size: 26,850 training samples
• Columns: sentence1, sentence2, and label
• Approximate statistics based on the first 1000 samples:

  	sentence1	sentence2	label
  type	string	string	int
  details	min: 8 tokens mean: 27.35 tokens max: 53 tokens	min: 8 tokens mean: 27.27 tokens max: 52 tokens	1: 100.00%

• Samples:

  sentence1	sentence2	label
  The newer Punts are still very much in existence today and race in the same fleets as the older boats .	The newer punts are still very much in existence today and run in the same fleets as the older boats .	1
  After losing his second election , he resigned as opposition leader and was replaced by Geoff Pearsall .	Max Bingham resigned as opposition leader after losing his second election , and was replaced by Geoff Pearsall .	1
  The 12F was officially homologated on August 21 , 1929 and exhibited at the Paris Salon in 1930 .	The 12F was officially homologated on 21 August 1929 and displayed at the 1930 Paris Salon .	1

• Loss: MultipleNegativesSymmetricRankingLoss with these parameters:

  {
      "scale": 20.0,
      "similarity_fct": "cos_sim",
      "gather_across_devices": false
  }
  

Evaluation Dataset

LangCache Sentence Pairs (all)

• Dataset: LangCache Sentence Pairs (all)
• Size: 26,850 evaluation samples
• Columns: sentence1, sentence2, and label
• Approximate statistics based on the first 1000 samples:

  	sentence1	sentence2	label
  type	string	string	int
  details	min: 8 tokens mean: 27.35 tokens max: 53 tokens	min: 8 tokens mean: 27.27 tokens max: 52 tokens	1: 100.00%

• Samples:

  sentence1	sentence2	label
  The newer Punts are still very much in existence today and race in the same fleets as the older boats .	The newer punts are still very much in existence today and run in the same fleets as the older boats .	1
  After losing his second election , he resigned as opposition leader and was replaced by Geoff Pearsall .	Max Bingham resigned as opposition leader after losing his second election , and was replaced by Geoff Pearsall .	1
  The 12F was officially homologated on August 21 , 1929 and exhibited at the Paris Salon in 1930 .	The 12F was officially homologated on 21 August 1929 and displayed at the 1930 Paris Salon .	1

• Loss: MultipleNegativesSymmetricRankingLoss with these parameters:

  {
      "scale": 20.0,
      "similarity_fct": "cos_sim",
      "gather_across_devices": false
  }
  

Training Logs

Epoch	Step	test_cosine_ap
-1	-1	0.6477

Framework Versions

• Python: 3.12.3
• Sentence Transformers: 5.1.0
• Transformers: 4.56.0
• PyTorch: 2.8.0+cu128
• Accelerate: 1.10.1
• Datasets: 4.0.0
• Tokenizers: 0.22.0

Citation

BibTeX

Sentence Transformers

@inproceedings{reimers-2019-sentence-bert,
    title = "Sentence-BERT: Sentence Embeddings using Siamese BERT-Networks",
    author = "Reimers, Nils and Gurevych, Iryna",
    booktitle = "Proceedings of the 2019 Conference on Empirical Methods in Natural Language Processing",
    month = "11",
    year = "2019",
    publisher = "Association for Computational Linguistics",
    url = "https://arxiv.org/abs/1908.10084",
}