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portfolio

publications

Variational Depth Search in ResNets

Published in NAS Workshop at ICLR, 2020

One-shot neural architecture search allows joint learning of weights and network architecture, reducing computational cost. We limit our search space to the depth of residual networks and formulate an analytically tractable variational objective that allows for obtaining an unbiased approximate posterior over depths in one-shot. We propose a heuristic to prune our networks based on this distribution. We compare our proposed method against manual search over network depths on the MNIST, Fashion-MNIST, SVHN datasets. We find that pruned networks do not incur a loss in predictive performance, obtaining accuracies competitive with unpruned networks. Marginalising over depth allows us to obtain better-calibrated test-time uncertainty estimates than regular networks, in a single forward pass.

talks

A Primer on Missing Data

Published:

In the real world, datasets are often messy – it is common for values to be missing or corrupt. Examples include empty cells in spreadsheets, unanswered survey questions, or readings from faulty sensors. Unfortunately, despite the frequent occurrence of such defects, software engineers tend not to develop algorithms that are robust to missing values. As a result, many standard algorithms fail on such datasets. This talk briefly discusses the theory of missing data and practical approaches for dealing with missingness in real-world machine learning. Presented at IndabaX South Africa 2019.

teaching

Teaching experience 1

Undergraduate course, University 1, Department, 2014

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Teaching experience 2

Workshop, University 1, Department, 2015

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