Bayesian Python: Bayesian inference tools for Python
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BayesPy - Bayesian Python

BayesPy provides tools for Bayesian inference with Python. The user constructs a model as a Bayesian network, observes data and runs posterior inference. The goal is to provide a tool which is efficient, flexible and extendable enough for expert use but also accessible for more casual users.

Currently, only variational Bayesian inference for conjugate-exponential family (variational message passing) has been implemented. Future work includes variational approximations for other types of distributions and possibly other approximate inference methods such as expectation propagation, Laplace approximations, Markov chain Monte Carlo (MCMC) and other methods. Contributions are welcome.

Project information

Copyright (C) 2011-2017 Jaakko Luttinen and other contributors (see below)

BayesPy including the documentation is licensed under the MIT License. See LICENSE file for a text of the license or visit

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Author Jaakko Luttinen [email protected]
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VIBES ( allows variational inference to be performed automatically on a Bayesian network. It is implemented in Java and released under revised BSD license.

Bayes Blocks ( is a C++/Python implementation of the variational building block framework. The framework allows easy learning of a wide variety of models using variational Bayesian learning. It is available as free software under the GNU General Public License.

Infer.NET ( is a .NET framework for machine learning. It provides message-passing algorithms and statistical routines for performing Bayesian inference. It is partly closed source and licensed for non-commercial use only.

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The list of contributors:

  • Jaakko Luttinen
  • Hannu Hartikainen
  • Deebul Nair
  • Christopher Cramer
  • Till Hoffmann

Each file or the git log can be used for more detailed information.

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