Active Inference Institute

Welcome 👋: welcome.activeinference.institute Join Discord: 💬 discord.activeinference.institute Explore Projects: 🔍 projects.activeinference.institute Active Inference Ecosystem: 🌐 ecosystem.activeinference.institute Videos: 🎥 video.activeinference.institute Volunteer: 🌱 volunteer.activeinference.institute Intern: 🎓 intern.activeinference.institute Newsletter: 📰 newsletter.activeinference.institute Fellows Program: 📖 fellows.activeinference.institute Partnerships: 🤝 partnerships.activeinference.institute Support the Institute: 💖 support.activeinference.institute Join us in advancing the field of Active Inference and be part of our growing community!

Code examples for Ch 1, 2, 3 now available! youtube.com/watch?v=qwjwbi… github.com/ActiveInferenc… More code and methods will be added as the textbook group proceeds

@GithubProjects github.com/ActiveInferenc…

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Using @mathematics_inc math.inc/opengauss and @NousResearch Hermes agent for Lean skills in the loop.

"Towards Lean 4 Formalization of the Free Energy Principle: AI-Driven Theorem Sketching and Verification for Active Inference and Bayesian Mechanics" Daniel Friedman Paper: zenodo.org/records/196992… Code: github.com/ActiveInferenc…

Fundamentals Textbook group has begun, first recording: youtube.com/watch?v=7UbCTp… Register at …tbook-group.activeinference.institute

A Literature Review Architecture for Active Inference: Scalable Assertion Extraction, Nanopublications, and Citation-Weighted Hypothesis Scoring: A Computational Meta-Analysis of the Active Inference Literature (2000–2026) zenodo.org/records/194619… Daniel Friedman & Joel Dietz github.com/ActiveInferenc…

Live in 5 minutes: youtube.com/live/dBAx-VDVc…

Announcements for week of April 8, 2026 weekly.activeinference.institute Upcoming Livestreams: ModelStream #007.3 ~ 4/9/2026 at 15 UTC with Conor Heins et al.: “pymdp 1.0.0“ youtube.com/live/dBAx-VDVc… Code: github.com/infer-actively… “Fundamentals of Active Inference” textbook group The first cohort of the “Fundamentals of Active Inference: Principles, Algorithms, and Applications of the Free Energy Principle for Engineers” textbook group is starting on April 21st! Register for the Textbook group here — …tbook-group.activeinference.institute Learn more about the author, Sanjeev Namjoshi, here — sanjeevnamjoshi.com Open Project Meetings this week: See activities.activeinference.institute for the location of all events listed here. 4/9/2026, 13:00 UTC — RxInfer.jl ~ Learning session. 4/10/2026, 13:00 UTC — RxInfer.jl ~ Projects session. Join the Discord: discord.activeinference.institute Learn more about the Active Inference Ecosystem ecosystem.activeinference.institute Make a Measurement to get your update included in the upcoming Newsletter: measure.activeinference.institute We are a 501(c)(3) educational non-profit. Donate at: donate.activeinference.institute Email blanket@activeinference.institute with any questions.

Fundamentals of Active Inference Textbook Group begins April 21st, all welcome to join: …tbook-group.activeinference.institute

Live in 1 hour: 2026 Quarterly Roundtable #1 youtube.com/live/_HkuQ0Hhi… Institute and Ecosystem Updates. Directions and opportunities for 2026. All Quarterly Roundtable videos since 2021: youtube.com/playlist?list=…

Live in 1 hour: GuestStream #127.1 Borjan Milinković, Jaan Aru: "On biological and artificial consciousness: A case for biological computationalism" youtube.com/live/yFaRYAvix… Paper: sciencedirect.com/science/articl…

Announcements for week of March 25, 2026 weekly.activeinference.institute Tune in on Friday March 27 at 18 UTC to watch the 2026 Quarterly Roundtable #1 youtube.com/live/_HkuQ0Hhi…: find out what the Institute has been up to in the first part of 2026, and (some of) what is upcoming this year. Upcoming Livestreams: GuestStream #127.1 ~ 3/26/2026 at 15 UTC with Borjan Milinković and Jaan Aru On biological and artificial consciousness: A case for biological computationalism youtube.com/live/yFaRYAvix… Roundtable 2026.1 ~ 3/27/2026 at 18 UTC 2026 Quarterly Roundtable #1 youtube.com/live/_HkuQ0Hhi… ModelStream #007.3 ~ 4/9/2026 at 15 UTC with Conor Heins et al.: “pymdp 1.0.0“ youtube.com/live/dBAx-VDVc… Code: github.com/infer-actively… “Fundamentals of Active Inference” textbook group The first cohort of the “Fundamentals of Active Inference: Principles, Algorithms, and Applications of the Free Energy Principle for Engineers” textbook group is starting on April 21st! Register for the Textbook group here — …tbook-group.activeinference.institute Learn more about the author, Sanjeev Namjoshi, here — sanjeevnamjoshi.com Open Project Meetings this week: See activities.activeinference.institute for the location of all events listed here. 3/26/2026, 13:00 UTC — RxInfer.jl ~ Learning session. 3/27/2026, 13:00 UTC — RxInfer.jl ~ Projects session. Join the Discord: discord.activeinference.institute Learn more about the Active Inference Ecosystem ecosystem.activeinference.institute Make a Measurement to get your update included in the upcoming Newsletter: measure.activeinference.institute We are a 501(c)(3) educational non-profit. Donate at: donate.activeinference.institute Email blanket@activeinference.institute with any questions.

"Active Inference for Physical AI Agents -- An Engineering Perspective" Bert de Vries arxiv.org/abs/2603.20927 [Submitted on 21 Mar 2026] Physical AI agents, such as robots and other embodied systems operating under tight and fluctuating resource constraints, remain far less capable than biological agents in open-ended real-world environments. This paper argues that Active Inference (AIF), grounded in the Free Energy Principle, offers a principled foundation for closing that gap. We develop this argument from first principles, following a chain from probability theory through Bayesian machine learning and variational inference to active inference and reactive message passing. From the FEP perspective, systems that maintain their structural and functional integrity over time can, under suitable assumptions, be described as minimizing variational free energy (VFE), and AIF operationalizes this by unifying perception, learning, planning, and control within a single computational objective. We show that VFE minimization is naturally realized by reactive message passing on factor graphs, where inference emerges from local, parallel computations. This realization is well matched to the constraints of physical operation, including hard deadlines, asynchronous data, fluctuating power budgets, and changing environments. Because reactive message passing is event-driven, interruptible, and locally adaptable, performance degrades gracefully under reduced resources while model structure can adjust online. We further show that, under suitable coupling and coarse-graining conditions, coupled AIF agents can be described as higher-level AIF agents, yielding a homogeneous architecture based on the same message-passing primitive across scales. Our contribution is not empirical benchmarking, but a clear theoretical and architectural case for the engineering community.

ModelStream #007.3 ~ 3/24/2026 at 15 UTC Conor Heins: pymdp 1.0.0 youtube.com/live/dBAx-VDVc… Code: github.com/infer-actively… Documentation: pymdp-rtd.readthedocs.io/en/latest/

It is 542 pages & slightly larger than the 2022 textbook.

"Fundamentals of Active Inference" is now published! mitpress.mit.edu/9780262050951/… Textbook Group begins in April at the Institute, all levels of familiarity with Active Inference welcome to join: coda.io/form/Active-In…

Announcements for week of March 9, 2026 weekly.activeinference.institute Upcoming Livestreams: GuestStream #127.1 ~ 3/16/2026 at 16 UTC Borjan Milinković and Jaan Aru:On biological and artificial consciousness: A case for biological computationalism youtube.com/live/yFaRYAvix… “Fundamentals of Active Inference” textbook group. We will have a collaborative textbook group For the upcoming textbook “Fundamentals of Active Inference: Principles, Algorithms, and Applications of the Free Energy Principle for Engineers” by Sanjeev V. Namjoshi (2026) — starting in April 2026! All details and registration form at: …tbook-group.activeinference.institute Open Project Meetings this week: See activities.activeinference.institute for the location of all events listed here. 3/12/2026, 13:00 UTC — RxInfer.jl ~ Learning session. 3/13/2026, 13:00 UTC — RxInfer.jl ~ Projects session. Join the Discord: discord.activeinference.institute Learn more about the Active Inference Ecosystem ecosystem.activeinference.institute Make a Measurement to get your update included in the upcoming Newsletter: measure.activeinference.institute We are a 501(c)(3) educational non-profit. Donate at: donate.activeinference.institute Email blanket@activeinference.institute with any questions.

Live: ModelStream #021.1 ~ Melih Kandemir Distributional Active Inference youtube.com/live/2NB7hTsp_…