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Poster
Causal-BALD: Deep Bayesian Active Learning of Outcomes to Infer Treatment-Effects from Observational Data
Andrew Jesson · Panagiotis Tigas · Joost van Amersfoort · Andreas Kirsch · Uri Shalit · Yarin Gal

Tue Dec 07 08:30 AM -- 10:00 AM (PST) @ None #None

Estimating personalized treatment effects from high-dimensional observational data is essential in situations where experimental designs are infeasible, unethical, or expensive. Existing approaches rely on fitting deep models on outcomes observed for treated and control populations. However, when measuring individual outcomes is costly, as is the case of a tumor biopsy, a sample-efficient strategy for acquiring each result is required. Deep Bayesian active learning provides a framework for efficient data acquisition by selecting points with high uncertainty. However, existing methods bias training data acquisition towards regions of non-overlapping support between the treated and control populations. These are not sample-efficient because the treatment effect is not identifiable in such regions. We introduce causal, Bayesian acquisition functions grounded in information theory that bias data acquisition towards regions with overlapping support to maximize sample efficiency for learning personalized treatment effects. We demonstrate the performance of the proposed acquisition strategies on synthetic and semi-synthetic datasets IHDP and CMNIST and their extensions, which aim to simulate common dataset biases and pathologies.

Author Information

Andrew Jesson (University of Oxford)
Panagiotis Tigas (University of Oxford)
Joost van Amersfoort (University of Oxford)
Andreas Kirsch (University of Oxford)

AIMS DPhil at University of Oxford, currently in 2nd year/4 (first paper: http://batchbald.ml) DeepMind: performance research engineer for 1 year Google: software engineer for 3 years MSc CompSci, BSc CompSci, BSc Maths at TU Munich

Uri Shalit (Technion)
Yarin Gal (University of Oxford)

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