Search Results for author: Lancelot Da Costa

Found 12 papers, 1 papers with code

Sample Path Regularity of Gaussian Processes from the Covariance Kernel

no code implementations22 Dec 2023 Nathaël Da Costa, Marvin Pförtner, Lancelot Da Costa, Philipp Hennig

While applications of GPs are myriad, a comprehensive understanding of GP sample paths, i. e. the function spaces over which they define a probability measure, is lacking.

Gaussian Processes

On efficient computation in active inference

1 code implementation2 Jul 2023 Aswin Paul, Noor Sajid, Lancelot Da Costa, Adeel Razi

Despite being recognized as neurobiologically plausible, active inference faces difficulties when employed to simulate intelligent behaviour in complex environments due to its computational cost and the difficulty of specifying an appropriate target distribution for the agent.

Computational Efficiency

Modelling non-reinforced preferences using selective attention

no code implementations25 Jul 2022 Noor Sajid, Panagiotis Tigas, Zafeirios Fountas, Qinghai Guo, Alexey Zakharov, Lancelot Da Costa

These memories are selectively attended to, using attention and gating blocks, to update agent's preferences.

OpenAI Gym

Geometric Methods for Sampling, Optimisation, Inference and Adaptive Agents

no code implementations20 Mar 2022 Alessandro Barp, Lancelot Da Costa, Guilherme França, Karl Friston, Mark Girolami, Michael I. Jordan, Grigorios A. Pavliotis

In this chapter, we identify fundamental geometric structures that underlie the problems of sampling, optimisation, inference and adaptive decision-making.

counterfactual Decision Making

Branching Time Active Inference: the theory and its generality

no code implementations22 Nov 2021 Théophile Champion, Lancelot Da Costa, Howard Bowman, Marek Grześ

In this paper, we present an alternative framework that aims to unify tree search and active inference by casting planning as a structure learning problem.

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

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.

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