# Pymc

Bayesian Modeling in Python
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PyMC (formerly PyMC3) is a Python package for Bayesian statistical modeling focusing on advanced Markov chain Monte Carlo (MCMC) and variational inference (VI) algorithms. Its flexibility and extensibility make it applicable to a large suite of problems.

Check out the PyMC overview, or one of the many examples! For questions on PyMC, head on over to our PyMC Discourse forum.

## Features

• Intuitive model specification syntax, for example, `x ~ N(0,1)` translates to `x = Normal('x',0,1)`
• Powerful sampling algorithms, such as the No U-Turn Sampler, allow complex models with thousands of parameters with little specialized knowledge of fitting algorithms.
• Variational inference: ADVI for fast approximate posterior estimation as well as mini-batch ADVI for large data sets.
• Relies on PyTensor which provides:
• Computation optimization and dynamic C or JAX compilation
• Linear algebra operators
• Simple extensibility
• Transparent support for missing value imputation

## Getting started

### Audio & Video

• Here is a YouTube playlist gathering several talks on PyMC.
• You can also find all the talks given at PyMCon 2020 here.
• The "Learning Bayesian Statistics" podcast helps you discover and stay up-to-date with the vast Bayesian community. Bonus: it's hosted by Alex Andorra, one of the PyMC core devs!

## Installation

To install PyMC on your system, follow the instructions on the installation guide.

## Citing PyMC

• Probabilistic programming in Python using PyMC3, Salvatier J., Wiecki T.V., Fonnesbeck C. (2016)
• A DOI for all versions.
• DOIs for specific versions are shown on Zenodo and under Releases

## Contact

We are using discourse.pymc.io as our main communication channel.

To ask a question regarding modeling or usage of PyMC we encourage posting to our Discourse forum under the Questions Category. You can also suggest feature in the Development Category.

You can also follow us on these social media platforms for updates and other announcements:

To report an issue with PyMC please use the issue tracker.

Finally, if you need to get in touch for non-technical information about the project, send us an e-mail.

## Software using PyMC

### General purpose

• Bambi: BAyesian Model-Building Interface (BAMBI) in Python.
• calibr8: A toolbox for constructing detailed observation models to be used as likelihoods in PyMC.
• gumbi: A high-level interface for building GP models.
• SunODE: Fast ODE solver, much faster than the one that comes with PyMC.
• pymc-learn: Custom PyMC models built on top of pymc3_models/scikit-learn API

### Domain specific

• Exoplanet: a toolkit for modeling of transit and/or radial velocity observations of exoplanets and other astronomical time series.
• beat: Bayesian Earthquake Analysis Tool.
• CausalPy: A package focussing on causal inference in quasi-experimental settings.

## Papers citing PyMC

See Google Scholar for a continuously updated list.

## Contributors

See the GitHub contributor page. Also read our Code of Conduct guidelines for a better contributing experience.

## Support

PyMC is a non-profit project under NumFOCUS umbrella. If you want to support PyMC financially, you can donate here.

## Professional Consulting Support

You can get professional consulting support from PyMC Labs.

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