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Alex Chan

5 accepted papers

2022

Inverse Online Learning: Understanding Non-Stationary and Reactionary Policies

ICLR 2022poster

Human decision making is well known to be imperfect and the ability to analyse such processes individually is crucial when attempting to aid or improve a decision-maker's ability to perform a task, e.g. to alert them to potential biases or oversights on their part. To do so, it is necessary to devel…

Cited by 8SourcePDFScholar
2022

POETREE: Interpretable Policy Learning with Adaptive Decision Trees

ICLR 2022spotlight

Building models of human decision-making from observed behaviour is critical to better understand, diagnose and support real-world policies such as clinical care. As established policy learning approaches remain focused on imitation performance, they fall short of explaining the demonstrated decisio…

Cited by 28SourcePDFScholar
2022

Synthetic Model Combination: An Instance-wise Approach to Unsupervised Ensemble Learning

NeurIPS 2022accept

Consider making a prediction over new test data without any opportunity to learn from a training set of labelled data - instead given access to a set of expert models and their predictions alongside some limited information about the dataset used to train them. In scenarios from finance to the medic…

Cited by 4SourcePDFScholar
2021

The Medkit-Learn(ing) Environment: Medical Decision Modelling through Simulation

NeurIPS 2021poster

The goal of understanding decision-making behaviours in clinical environments is of paramount importance if we are to bring the strengths of machine learning to ultimately improve patient outcomes. Mainstream development of algorithms is often geared towards optimal performance in tasks that do not…

Cited by 20SourcecodeScholar
2020

Unlabelled Data Improves Bayesian Uncertainty Calibration under Covariate Shift

ICML 2020poster

Modern neural networks have proven to be powerful function approximators, providing state-of-the-art performance in a multitude of applications. They however fall short in their ability to quantify confidence in their predictions — this is crucial in high-stakes applications that involve critical de…

Cited by 57SourcePDFScholar