Search Results for author: Christopher G. Lucas

Found 19 papers, 6 papers with code

ICED: Zero-Shot Transfer in Reinforcement Learning via In-Context Environment Design

no code implementations5 Feb 2024 Samuel Garcin, James Doran, Shangmin Guo, Christopher G. Lucas, Stefano V. Albrecht

ICED generates levels using a variational autoencoder trained over an initial set of level parameters, reducing distributional shift, and achieves significant improvements in ZSG over adaptive level sampling strategies and UED methods.

Reinforcement Learning (RL)

Data-driven Prior Learning for Bayesian Optimisation

1 code implementation24 Nov 2023 Sigrid Passano Hellan, Christopher G. Lucas, Nigel H. Goddard

We replace this assumption with a weaker one only requiring the shape of the optimisation landscape to be similar, and analyse the recent method Prior Learning for Bayesian Optimisation - PLeBO - in this setting.

Bayesian Optimisation Transfer Learning

Non-Compositionality in Sentiment: New Data and Analyses

1 code implementation31 Oct 2023 Verna Dankers, Christopher G. Lucas

When natural language phrases are combined, their meaning is often more than the sum of their parts.

Sentiment Analysis

Balancing utility and cognitive cost in social representation

no code implementations7 Oct 2023 Max Taylor-Davies, Christopher G. Lucas

To successfully navigate its environment, an agent must construct and maintain representations of the other agents that it encounters.

Navigate

How the level sampling process impacts zero-shot generalisation in deep reinforcement learning

no code implementations5 Oct 2023 Samuel Garcin, James Doran, Shangmin Guo, Christopher G. Lucas, Stefano V. Albrecht

A key limitation preventing the wider adoption of autonomous agents trained via deep reinforcement learning (RL) is their limited ability to generalise to new environments, even when these share similar characteristics with environments encountered during training.

Reinforcement Learning (RL)

Modeling infant object perception as program induction

no code implementations28 Aug 2023 Jan-Philipp Fränken, Christopher G. Lucas, Neil R. Bramley, Steven T. Piantadosi

Infants expect physical objects to be rigid and persist through space and time and in spite of occlusion.

Attribute Object +2

DreamDecompiler: Bayesian Program Learning by Decompiling Amortised Knowledge

no code implementations13 Jun 2023 Alessandro B. Palmarini, Christopher G. Lucas, N. Siddharth

The cost of search is amortised by training a neural search policy, reducing search breadth and effectively "compiling" useful information to compose program solutions across tasks.

Program induction Program Synthesis

Bayesian Optimisation Against Climate Change: Applications and Benchmarks

1 code implementation7 Jun 2023 Sigrid Passano Hellan, Christopher G. Lucas, Nigel H. Goddard

Bayesian optimisation is a powerful method for optimising black-box functions, popular in settings where the true function is expensive to evaluate and no gradient information is available.

Bayesian Optimisation

Designing Optimal Behavioral Experiments Using Machine Learning

1 code implementation12 May 2023 Simon Valentin, Steven Kleinegesse, Neil R. Bramley, Peggy Seriès, Michael U. Gutmann, Christopher G. Lucas

As compared to experimental designs commonly used in the literature, we show that our optimal designs more efficiently determine which of a set of models best account for individual human behavior, and more efficiently characterize behavior given a preferred model.

Decision Making Experimental Design

Selective imitation on the basis of reward function similarity

no code implementations12 May 2023 Max Taylor-Davies, Stephanie Droop, Christopher G. Lucas

Imitation is a key component of human social behavior, and is widely used by both children and adults as a way to navigate uncertain or unfamiliar situations.

Inductive Bias Navigate

Causal Explanations for Sequential Decision-Making in Multi-Agent Systems

1 code implementation21 Feb 2023 Balint Gyevnar, Cheng Wang, Christopher G. Lucas, Shay B. Cohen, Stefano V. Albrecht

We present CEMA: Causal Explanations in Multi-Agent systems; a framework for creating causal natural language explanations of an agent's decisions in dynamic sequential multi-agent systems to build more trustworthy autonomous agents.

Autonomous Driving counterfactual +2

Actively learning to learn causal relationships

no code implementations20 Jun 2022 Chentian Jiang, Christopher G. Lucas

We propose a hierarchical Bayesian model that goes beyond past models by predicting that people pursue information not only about the causal relationship at hand but also about causal overhypotheses$\unicode{x2014}$abstract beliefs about causal relationships that span multiple situations and constrain how we learn the specifics in each situation.

Active Learning

Can Transformer be Too Compositional? Analysing Idiom Processing in Neural Machine Translation

1 code implementation ACL 2022 Verna Dankers, Christopher G. Lucas, Ivan Titov

In this work, we investigate whether the non-compositionality of idioms is reflected in the mechanics of the dominant NMT model, Transformer, by analysing the hidden states and attention patterns for models with English as source language and one of seven European languages as target language.

Machine Translation NMT +1

Bayesian Optimisation for Active Monitoring of Air Pollution

no code implementations15 Feb 2022 Sigrid Passano Hellan, Christopher G. Lucas, Nigel H. Goddard

Air pollution is one of the leading causes of mortality globally, resulting in millions of deaths each year.

Bayesian Optimisation

Building Object-based Causal Programs for Human-like Generalization

no code implementations20 Nov 2021 Bonan Zhao, Christopher G. Lucas, Neil R. Bramley

We present a novel task that measures how people generalize objects' causal powers based on observing a single (Experiment 1) or a few (Experiment 2) causal interactions between object pairs.

Navigate Object

The Human Kernel

no code implementations NeurIPS 2015 Andrew Gordon Wilson, Christoph Dann, Christopher G. Lucas, Eric P. Xing

Bayesian nonparametric models, such as Gaussian processes, provide a compelling framework for automatic statistical modelling: these models have a high degree of flexibility, and automatically calibrated complexity.

Gaussian Processes

A rational model of preference learning and choice prediction by children

no code implementations NeurIPS 2008 Christopher G. Lucas, Thomas L. Griffiths, Fei Xu, Christine Fawcett

Young children demonstrate the ability to make inferences about the preferences of other agents based on their choices.

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