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Transformers

Open Source
★ 167,598 • Updated Oct 12, 2026, 09:03 PM

Transformers is a model-definition framework for state-of-the-art machine learning models in text, vision, audio, and multimodal models, for both inference and training.

Use Cases ▼
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Text generation

02

Text classification

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Named entity recognition

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Question answering

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Summarization

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Translation

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Image classification

08

Object detection

What Problem It Solves ▼

Transformers solves the problem of providing a unified and easy-to-use interface for state-of-the-art machine learning models in various domains, including text, vision, audio, and multimodal models. It provides a centralized model definition that is agreed upon across the ecosystem, making it easier for researchers, engineers, and developers to use and build upon these models. The library also solves the problem of reducing compute costs and carbon footprint by providing a way to share trained models instead of training from scratch. Additionally, Transformers provides a simple and customizable way to use state-of-the-art models, making it easier for users to adapt the models to their specific needs and use cases.

Key Features ▼
✓

Easy to use

✓

Unified API for all models

✓

Supports over 1M+ model checkpoints

✓

Optimized for PyTorch models

✓

Simple and customizable

Overview

Transformers is a model-definition framework for state-of-the-art machine learning models in text, vision, audio, and multimodal models, for both inference and training. It centralizes the model definition so that this definition is agreed upon across the ecosystem. The library provides a unified API for using all its pretrained models and supports over 1M+ model checkpoints on the Hugging Face Hub. Transformers works with Python 3.10+ and PyTorch 2.6+, and it is optimized to work with PyTorch models provided by the library. The training API is designed to work with PyTorch models, and the example scripts are only examples that may need to be adapted for specific use cases. The library is not a modular toolbox of building blocks for neural nets, and the code in the model files is not refactored with additional abstractions on purpose, so that researchers can quickly iterate on each of the models without diving into additional abstractions/files. Transformers is more than a toolkit to use pretrained models, it's a community of projects built around it and the Hugging Face Hub. The library provides a wide range of example models for various use cases, including audio classification, automatic speech recognition, image classification, object detection, and more. It also provides a Pipeline API that supports text, audio, vision, and multimodal tasks, and it handles preprocessing the input and returns the appropriate output. The library is designed to be easy to use, with a low barrier to entry for researchers, engineers, and developers, and it provides a simple and customizable way to use state-of-the-art models. Transformers is widely used in the industry and academia, and it has been cited in numerous research papers. The library is actively maintained and updated, with new features and models being added regularly. Overall, Transformers is a powerful and flexible library that provides a wide range of tools and resources for building and using state-of-the-art machine learning models.

Pros & Cons

Pros

+

Easy to use

+

Unified API for all models

+

Supports over 1M+ model checkpoints

+

Optimized for PyTorch models

+

Simple and customizable

Cons

−

Not a modular toolbox of building blocks for neural nets

−

Example scripts may need to be adapted for specific use cases

−

Training API is optimized for PyTorch models

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