Bayesian Python Packages

arviz

Exploratory analysis of Bayesian models with Python

pyro-ppl

Deep universal probabilistic programming with Python and PyTorch

pydlm

A python library for Bayesian time series modeling

orbit-ml

A Python package for Bayesian forecasting with object-oriented design and probabilistic models under the hood.

lightweight-mmm

LightweightMMM 🦇 is a lightweight Bayesian Marketing Mix Modeling (MMM) library that allows users to easily train MMMs and obtain channel attribution information.

nested-fit

Bayesian data analysis code for evidence and probability distribution calculation based on nested sampling algorithm

aelfrice

Bayesian memory that learns from feedback for LLM agents

gempy

GemPy is an open-source, Python-based 3-D structural geological modeling software, which allows the implicit (i.e. automatic) creation of complex geological models from interface and orientation data. It also offers support for stochastic modeling to address parameter and model uncertainties.

changepoint

A toolkit for Bayesian change point detection

bsts-causalimpact

Bayesian CausalImpact for Python — R-compatible Gibbs sampler in Rust (PyO3), 30x faster, no TensorFlow

btrack

Bayesian multi-object tracking

satrank

Trust scores for Lightning agents. The PageRank of the agentic economy.

polars-timeseries

Polars Time Series Extension

bocd

Bayesian Changepoint Detection

ise-py

A package for creation and analysis of ice-sheet emulators.

posteriordb

python interface to posterior database

argus-debate-ai

ARGUS: Production-ready multi-agent AI debate framework with RAG, Bayesian reasoning, provenance tracking, 50+ tool integrations, OpenAPI REST generation, context caching/compression, and advanced LLM orchestration for scientific discovery, fact-checking, and evidence-based decision-making

lampe

Likelihood-free AMortized Posterior Estimation with PyTorch

actuarcredibility

Credibility models for actuarial pricing: Bühlmann, Bühlmann-Straub, Jewell hierarchical, Hachemeister regression, classical, and Bayesian (PyMC). pip install actuarcredibility

pyepidag

Epidemiological inference with DAG

brmspy

Python-first access to R’s brms with proper parameter names, ArviZ support, and cmdstanr performance. The easiest way to run brms models from Python.

fastrvm

[fastrvm] Relevance Vector Machine in Python with a C++ core

biolith

Bayesian Ecological Modeling in Python

rein-ai

Runtime kill-switch for autonomous AI agents. Regime-aware Bayesian governor, NL policy compiler, adversarial red-team simulator. AGPL + commercial.