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ORCHESTRATE18h ago • 3 min read
Active Inference — The Learn Arc, Part 50: Series capstone
Fifty posts. Ten chapters. One framework. The Learn Arc closes with a reader's map, a short what-to-...
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ORCHESTRATE19h ago • 5 min read
Active Inference, The Learn Arc — Part 8: Chapter 7 — POMDPs, Sophisticated Planning, and Dirichlet Learning
Chapter 7 is the muscle chapter. Full-colour POMDPs, belief-propagated tree search, Dirichlet-learne...
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ORCHESTRATE18h ago • 3 min read
Active Inference — The Learn Arc, Part 43: Session §8.4 — Continuous play
The final Chapter 8 session. A continuous-time playground. Change precisions on the fly, poke the wo...
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ORCHESTRATE20h ago • 7 min read
Active Inference, The Learn Arc — Part 5: Chapter 4 — A, B, C, D and the Generative Model You Can Actually Build
Chapter 4 makes the theory concrete. A/B/C/D matrices, Eq. 4.13 belief updates, Eq. 4.14 policy post...
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ORCHESTRATE18h ago • 3 min read
Active Inference — The Learn Arc, Part 36: Session §7.2 — Message passing and Eq 4.13 in depth
Eq 4.13 is not folklore — it is belief propagation on a two-node factor graph. Session 7.2 walks the...
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ORCHESTRATE18h ago • 3 min read
Active Inference — The Learn Arc, Part 38: Session §7.4 — Hierarchical active inference
Stacking POMDPs. Top level models slow, abstract state. Bottom level models fast, concrete state. Me...
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ORCHESTRATE18h ago • 3 min read
Active Inference — The Learn Arc, Part 40: Session §8.1 — Generalized coordinates
Chapter 8 opens. Time becomes continuous. Belief becomes a tower: state, velocity, acceleration, jer...
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ORCHESTRATE18h ago • 3 min read
Active Inference — The Learn Arc, Part 42: Session §8.3 — Action on sensors
The quadratic F predicts what sensors should report. When reality disagrees, the agent has two knobs...
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ORCHESTRATE18h ago • 3 min read
Active Inference — The Learn Arc, Part 41: Session §8.2 — Eq 4.19, the quadratic free energy
Eq 4.19 is Eq 4.13's continuous-time twin. A quadratic F in generalized coordinates gives a closed-f...
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ORCHESTRATE18h ago • 3 min read
Active Inference — The Learn Arc, Part 45: Session §9.2 — Comparing models
Two candidate Active Inference models for the same subject — which wins? Free-energy model compariso...
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ORCHESTRATE18h ago • 3 min read
Active Inference — The Learn Arc, Part 44: Session §9.1 — Fit to data
Chapter 9 opens. We stop asking how an agent acts and start asking how we fit an Active Inference mo...
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ORCHESTRATE18h ago • 2 min read
Active Inference — The Learn Arc, Part 47: Session §10.1 — Perception, action, learning
Chapter 10 opens. The final chapter re-reads everything under one lens: one agent, one free energy, ...
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ORCHESTRATE18h ago • 3 min read
Active Inference — The Learn Arc, Part 48: Session §10.2 — Limitations
The honest session. What Active Inference is NOT good at, what it handwaves, and where the assumptio...
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ORCHESTRATE18h ago • 3 min read
Active Inference — The Learn Arc, Part 46: Session §9.3 — Case study
One subject, one dataset, two candidate models, one Bayes factor. Chapter 9 in miniature — the self-...
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ORCHESTRATE18h ago • 3 min read
Active Inference — The Learn Arc, Part 37: Session §7.3 — Learning A and B
The matrices stop being fixed. Dirichlet counts on A and B turn perception and learning into the sam...
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ORCHESTRATE19h ago • 5 min read
Active Inference, The Learn Arc — Part 26: Session §4.4 — The MDP World, Where the A/B/C/D Stack Meets Reality
Chapter 4, §4. A fully specified MDP world: the tiny corridor from start to goal. All four matrices ...
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ORCHESTRATE18h ago • 2 min read
Active Inference — The Learn Arc, Part 35: Session §7.1 — Discrete-time refresher
Chapter 7 opens with a fast rewind. Before we add learning, depth, and hierarchy, we re-walk the dis...
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ORCHESTRATE18h ago • 3 min read
Active Inference — The Learn Arc, Part 39: Session §7.5 — Worked example (the Chapter 7 capstone)
The longest session in the book. Dirichlet A and B, two-layer hierarchy, live EFE, all running at on...
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ORCHESTRATE18h ago • 3 min read
Active Inference — The Learn Arc, Part 49: Session §10.3 — Where next
The roadmap session. Which open problems in Active Inference are close to tractable, which are bets,...
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ORCHESTRATE19h ago • 5 min read
Active Inference, The Learn Arc — Part 23: Session §4.1 — States, Observations, Actions — The Three Lists
Chapter 4, §1. Before you fill any matrices, you list three things: hidden states, observations, act...
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