Search Results for author: Thomas Parr

Found 12 papers, 2 papers with code

Active Inference and Intentional Behaviour

no code implementations6 Dec 2023 Karl J. Friston, Tommaso Salvatori, Takuya Isomura, Alexander Tschantz, Alex Kiefer, Tim Verbelen, Magnus Koudahl, Aswin Paul, Thomas Parr, Adeel Razi, Brett Kagan, Christopher L. Buckley, Maxwell J. D. Ramstead

First, we simulate the aforementioned in vitro experiments, in which neuronal cultures spontaneously learn to play Pong, by implementing nested, free energy minimising processes.

A variational synthesis of evolutionary and developmental dynamics

no code implementations8 Mar 2023 Karl Friston, Daniel Ari Friedman, Axel Constant, V. Bleu Knight, Thomas Parr, John O. Campbell

This paper introduces a variational formulation of natural selection, paying special attention to the nature of "things" and the way that different "kinds" of "things" are individuated from - and influence - each other.

Model Selection

Bistable perception, precision and neuromodulation

no code implementations19 Dec 2022 Filip Novicky, Thomas Parr, Karl Friston, M. Berk Mirza, Noor Sajid

Bistable perception follows from observing a static, ambiguous, (visual) stimulus with two possible interpretations.

Bayesian Inference

Active inference, Bayesian optimal design, and expected utility

no code implementations21 Sep 2021 Noor Sajid, Lancelot Da Costa, Thomas Parr, Karl Friston

Conversely, active inference reduces to Bayesian decision theory in the absence of ambiguity and relative risk, i. e., expected utility maximization.

Bayesian brains and the Rényi divergence

no code implementations12 Jul 2021 Noor Sajid, Francesco Faccio, Lancelot Da Costa, Thomas Parr, Jürgen Schmidhuber, Karl Friston

Under the Bayesian brain hypothesis, behavioural variations can be attributed to different priors over generative model parameters.

Bayesian Inference Variational Inference

Reward Maximisation through Discrete Active Inference

no code implementations17 Sep 2020 Lancelot Da Costa, Noor Sajid, Thomas Parr, Karl Friston, Ryan Smith

Precisely, we show the conditions under which active inference produces the optimal solution to the Bellman equation--a formulation that underlies several approaches to model-based reinforcement learning and control.

Decision Making Model-based Reinforcement Learning +2

Action and Perception as Divergence Minimization

1 code implementation3 Sep 2020 Danijar Hafner, Pedro A. Ortega, Jimmy Ba, Thomas Parr, Karl Friston, Nicolas Heess

While the narrow objectives correspond to domain-specific rewards as typical in reinforcement learning, the general objectives maximize information with the environment through latent variable models of input sequences.

Decision Making Representation Learning

Sophisticated Inference

no code implementations7 Jun 2020 Karl Friston, Lancelot Da Costa, Danijar Hafner, Casper Hesp, Thomas Parr

In this paper, we consider a sophisticated kind of active inference, using a recursive form of expected free energy.

Active Learning counterfactual

Neural dynamics under active inference: plausibility and efficiency of information processing

no code implementations22 Jan 2020 Lancelot Da Costa, Thomas Parr, Biswa Sengupta, Karl Friston

We then show that these neuronal dynamics approximate natural gradient descent, a well-known optimisation algorithm from information geometry that follows the steepest descent of the objective in information space.

Active inference: demystified and compared

1 code implementation24 Sep 2019 Noor Sajid, Philip J. Ball, Thomas Parr, Karl J. Friston

In this paper, we provide: 1) an accessible overview of the discrete-state formulation of active inference, highlighting natural behaviors in active inference that are generally engineered in RL; 2) an explicit discrete-state comparison between active inference and RL on an OpenAI gym baseline.

Atari Games OpenAI Gym +2

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