base on State-of-the-Art Text Embeddings <!--- BADGES: START ---> [](https://huggingface.co/models?library=sentence-transformers) [][#github-license] [][#pypi-package] [][#pypi-package] [][#docs-package] <!-- [][#pypi-package] --> [#github-license]: https://github.com/UKPLab/sentence-transformers/blob/master/LICENSE [#pypi-package]: https://pypi.org/project/sentence-transformers/ [#conda-forge-package]: https://anaconda.org/conda-forge/sentence-transformers [#docs-package]: https://www.sbert.net/ <!--- BADGES: END ---> # Sentence Transformers: Embeddings, Retrieval, and Reranking This framework provides an easy method to compute embeddings for accessing, using, and training state-of-the-art embedding and reranker models. It compute embeddings using Sentence Transformer models ([quickstart](https://sbert.net/docs/quickstart.html#sentence-transformer)) or to calculate similarity scores using Cross-Encoder (a.k.a. reranker) models ([quickstart](https://sbert.net/docs/quickstart.html#cross-encoder)). This unlocks a wide range of applications, including [semantic search](https://sbert.net/examples/applications/semantic-search/README.html), [semantic textual similarity](https://sbert.net/docs/sentence_transformer/usage/semantic_textual_similarity.html), and [paraphrase mining](https://sbert.net/examples/applications/paraphrase-mining/README.html). A wide selection of over [10,000 pre-trained Sentence Transformers models](https://huggingface.co/models?library=sentence-transformers) are available for immediate use on 🤗 Hugging Face, including many of the state-of-the-art models from the [Massive Text Embeddings Benchmark (MTEB) leaderboard](https://huggingface.co/spaces/mteb/leaderboard). Additionally, it is easy to train or finetune your own [embedding models](https://sbert.net/docs/sentence_transformer/training_overview.html) or [reranker models](https://sbert.net/docs/cross_encoder/training_overview.html) using Sentence Transformers, enabling you to create custom models for your specific use cases. For the **full documentation**, see **[www.SBERT.net](https://www.sbert.net)**. ## Installation We recommend **Python 3.9+**, **[PyTorch 1.11.0+](https://pytorch.org/get-started/locally/)**, and **[transformers v4.34.0+](https://github.com/huggingface/transformers)**. **Install with pip** ``` pip install -U sentence-transformers ``` **Install with conda** ``` conda install -c conda-forge sentence-transformers ``` **Install from sources** Alternatively, you can also clone the latest version from the [repository](https://github.com/UKPLab/sentence-transformers) and install it directly from the source code: ```` pip install -e . ```` **PyTorch with CUDA** If you want to use a GPU / CUDA, you must install PyTorch with the matching CUDA Version. Follow [PyTorch - Get Started](https://pytorch.org/get-started/locally/) for further details how to install PyTorch. ## Getting Started See [Quickstart](https://www.sbert.net/docs/quickstart.html) in our documentation. ### Embedding Models First download a pretrained embedding a.k.a. Sentence Transformer model. ````python from sentence_transformers import SentenceTransformer model = SentenceTransformer("all-MiniLM-L6-v2") ```` Then provide some texts to the model. ````python sentences = [ "The weather is lovely today.", "It's so sunny outside!", "He drove to the stadium.", ] embeddings = model.encode(sentences) print(embeddings.shape) # => (3, 384) ```` And that's already it. We now have a numpy arrays with the embeddings, one for each text. We can use these to compute similarities. ````python similarities = model.similarity(embeddings, embeddings) print(similarities) # tensor([[1.0000, 0.6660, 0.1046], # [0.6660, 1.0000, 0.1411], # [0.1046, 0.1411, 1.0000]]) ```` ### Reranker Models First download a pretrained reranker a.k.a. Cross Encoder model. ```python from sentence_transformers import CrossEncoder # 1. Load a pretrained CrossEncoder model model = CrossEncoder("cross-encoder/ms-marco-MiniLM-L6-v2") ``` Then provide some texts to the model. ```python # The texts for which to predict similarity scores query = "How many people live in Berlin?" passages = [ "Berlin had a population of 3,520,031 registered inhabitants in an area of 891.82 square kilometers.", "Berlin has a yearly total of about 135 million day visitors, making it one of the most-visited cities in the European Union.", "In 2013 around 600,000 Berliners were registered in one of the more than 2,300 sport and fitness clubs.", ] # 2a. predict scores pairs of texts scores = model.predict([(query, passage) for passage in passages]) print(scores) # => [8.607139 5.506266 6.352977] ``` And we're good to go. You can also use [`model.rank`](https://sbert.net/docs/package_reference/cross_encoder/cross_encoder.html#sentence_transformers.cross_encoder.CrossEncoder.rank) to avoid having to perform the reranking manually: ```python # 2b. Rank a list of passages for a query ranks = model.rank(query, passages, return_documents=True) print("Query:", query) for rank in ranks: print(f"- #{rank['corpus_id']} ({rank['score']:.2f}): {rank['text']}") """ Query: How many people live in Berlin? - #0 (8.61): Berlin had a population of 3,520,031 registered inhabitants in an area of 891.82 square kilometers. - #2 (6.35): In 2013 around 600,000 Berliners were registered in one of the more than 2,300 sport and fitness clubs. - #1 (5.51): Berlin has a yearly total of about 135 million day visitors, making it one of the most-visited cities in the European Union. """ ``` ## Pre-Trained Models We provide a large list of pretrained models for more than 100 languages. Some models are general purpose models, while others produce embeddings for specific use cases. * [Pretrained Sentence Transformer (Embedding) Models](https://sbert.net/docs/sentence_transformer/pretrained_models.html) * [Pretrained Cross Encoder (Reranker) Models](https://sbert.net/docs/cross_encoder/pretrained_models.html) ## Training This framework allows you to fine-tune your own sentence embedding methods, so that you get task-specific sentence embeddings. You have various options to choose from in order to get perfect sentence embeddings for your specific task. * Embedding Models * [Sentence Transformer > Training Overview](https://www.sbert.net/docs/sentence_transformer/training_overview.html) * [Sentence Transformer > Training Examples](https://www.sbert.net/docs/sentence_transformer/training/examples.html) or [training examples on GitHub](https://github.com/UKPLab/sentence-transformers/tree/master/examples/sentence_transformer/training). * Reranker Models * [Cross Encoder > Training Overview](https://www.sbert.net/docs/cross_encoder/training_overview.html) * [Cross Encoder > Training Examples](https://www.sbert.net/docs/cross_encoder/training/examples.html) or [training examples on GitHub](https://github.com/UKPLab/sentence-transformers/tree/master/examples/cross_encoder/training). Some highlights across both types of training are: - Support of various transformer networks including BERT, RoBERTa, XLM-R, DistilBERT, Electra, BART, ... - Multi-Lingual and multi-task learning - Evaluation during training to find optimal model - [20+ loss functions](https://www.sbert.net/docs/package_reference/sentence_transformer/losses.html) for embedding models and [10+ loss functions](https://www.sbert.net/docs/package_reference/cross_encoder/losses.html) for reranker models, allowing you to tune models specifically for semantic search, paraphrase mining, semantic similarity comparison, clustering, triplet loss, contrastive loss, etc. ## Application Examples You can use this framework for: - [Computing Sentence Embeddings](https://www.sbert.net/examples/sentence_transformer/applications/computing-embeddings/README.html) - [Semantic Textual Similarity](https://www.sbert.net/docs/usage/semantic_textual_similarity.html) - [Semantic Search](https://www.sbert.net/examples/sentence_transformer/applications/semantic-search/README.html) - [Retrieve & Re-Rank](https://www.sbert.net/examples/sentence_transformer/applications/retrieve_rerank/README.html) - [Clustering](https://www.sbert.net/examples/sentence_transformer/applications/clustering/README.html) - [Paraphrase Mining](https://www.sbert.net/examples/sentence_transformer/applications/paraphrase-mining/README.html) - [Translated Sentence Mining](https://www.sbert.net/examples/sentence_transformer/applications/parallel-sentence-mining/README.html) - [Multilingual Image Search, Clustering & Duplicate Detection](https://www.sbert.net/examples/sentence_transformer/applications/image-search/README.html) and many more use-cases. For all examples, see [examples/sentence_transformer/applications](https://github.com/UKPLab/sentence-transformers/tree/master/examples/sentence_transformer/applications). ## Development setup After cloning the repo (or a fork) to your machine, in a virtual environment, run: ``` python -m pip install -e ".[dev]" pre-commit install ``` To test your changes, run: ``` pytest ``` ## Citing & Authors If you find this repository helpful, feel free to cite our publication [Sentence-BERT: Sentence Embeddings using Siamese BERT-Networks](https://arxiv.org/abs/1908.10084): ```bibtex @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", } ``` If you use one of the multilingual models, feel free to cite our publication [Making Monolingual Sentence Embeddings Multilingual using Knowledge Distillation](https://arxiv.org/abs/2004.09813): ```bibtex @inproceedings{reimers-2020-multilingual-sentence-bert, title = "Making Monolingual Sentence Embeddings Multilingual using Knowledge Distillation", author = "Reimers, Nils and Gurevych, Iryna", booktitle = "Proceedings of the 2020 Conference on Empirical Methods in Natural Language Processing", month = "11", year = "2020", publisher = "Association for Computational Linguistics", url = "https://arxiv.org/abs/2004.09813", } ``` Please have a look at [Publications](https://www.sbert.net/docs/publications.html) for our different publications that are integrated into SentenceTransformers. Maintainer: [Tom Aarsen](https://github.com/tomaarsen), 🤗 Hugging Face https://www.ukp.tu-darmstadt.de/ Don't hesitate to open an issue if something is broken (and it shouldn't be) or if you have further questions. > This repository contains experimental software and is published for the sole purpose of giving additional background details on the respective publication. 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