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The project

SpeechBrain is an open-source and all-in-one speech toolkit relying on PyTorch.

The goal is to create a single, flexible, and user-friendly toolkit that can be used to easily develop state-of-the-art speech technologies, including systems for speech recognition (both end-to-end and HMM-DNN), speaker recognition, speech separation, multi-microphone signal processing (e.g, beamforming), self-supervised and unsupervised learning, speech contamination / augmentation, and many others. The toolkit will be designed to be a stand-alone framework, but simple interfaces with well-known toolkits, such as Kaldi will also be implemented.

SpeechBrain is currently under development and has been announced in September 2019. A first alpha version will be available during the 2020 winter.

See a short introductory video on the SpeechBrain project

We are also happy to share a timeline for the project. The Public Release will allow the community to start developing and use the toolkit freely and fully. The private release only concerns specific collaborators that have an important expertise on different speech-related domains, please see the How to collaborate Section if interested!


Why SpeechBrain?

Speech processing toolkits have gained popularity in the last years. For automatic speech recognition (ASR) purposes, for instance, Kaldi is an established framework. Some other ASR toolkits have been recently developed using the Python language such as PyTorch-Kaldi, PyKaldi, and ESPnet. Beyond speech recognition, a variety of other solutions have been developed for speech-related applications, such as speech separation, speech enhancement, speaker recognition, and language model training.

Even though many of these frameworks could be very helpful for the specific task for which they are designed, our experience in the field suggests that having a single, efficient, and flexible toolkit can significantly speed up research and development of speech and audio processing techniques. Indeed, it is significantly easier to familiarize oneself with a single toolkit than to learn several different frameworks. Moreover, the use of a single platform for different speech and audio applications makes it more natural to develop multi-task systems that jointly solve different problems. It is also easier to build a strong and fruitful community when considering a unique and self-contained framework.

Why PyTorch?

To ensure the needed flexibility and the user-friendliness of our system, we think that our platform must be built on the top of PyTorch for the following reasons:


During the project, we plan to collaborate with the PyTorch Audio team of Facebook and with NVIDIA, that has recently developed the Neural Modules toolkit (Nemo), which provides flexibility and modularity to accelerate speech applications.

How to collaborate

A strong toolkit needs a strong community. While a core team will be dedicated to develop and maintain the core functionalities of SpeechBrain, we need the help of the entire community to extend this ambitious project to numerous and various applications. Feel free to contact us, if you are interested to contribute.

Join us!

Thanks to our sponsors, we are hiring talented interns (3-6 months internships) that will work at Mila (Montréal) with the core development team. The ideal candidate is a PhD student with a strong experience in both PyTorch and speech technologies. Send us your CV if you are interested in this opportunity!

Contact us

If you are interested to collaborate or sponsor us, or if you simply want to hear more about this project, please contact us at

SpeechBrain and Social Good

The development and use of SpeechBrain technologies are parts of a policy of concern for AI for the “social good”. Therefore, all partners, collaborators and participants declare having read the Montreal Declaration for a responsible development of AI, adhere to these principles and implement them as part of the SpeechBrain project. Unfortunately, and as SpeechBrain is a completely open source project, users of the toolkit do not have any legal obligation to respect this declaration. However, the initial SpeechBrain team started this project with the goal of impacting positively the civil society.


Partner Institutions

Partner Institutions are organizations that have accepted to collaborate within SpeechBrain by dedicating important human or hardware resources. They are involved in the decision process by participating in weekly organized meetings. If interested in becoming the next official partner, please contact us at


Collaborators are actors interested in contributing to the project. It could be individual or small groups of researchers, companies, or anyone interested to develop an important module of SpeechBrain. Active collaborators are invited to the meetings to better synchronize their contributions.