Search Results for author: Zac Cranko

Found 11 papers, 2 papers with code

The Geometry and Calculus of Losses

no code implementations1 Sep 2022 Robert C. Williamson, Zac Cranko

In this paper we systematically develop the theory of loss functions for such problems from a novel perspective whose basic ingredients are convex sets with a particular structure.

Information Processing Equalities and the Information-Risk Bridge

no code implementations25 Jul 2022 Robert C. Williamson, Zac Cranko

We introduce two new classes of measures of information for statistical experiments which generalise and subsume $\phi$-divergences, integral probability metrics, $\mathfrak{N}$-distances (MMD), and $(f,\Gamma)$ divergences between two or more distributions.

The Geometry of Adversarial Subspaces

no code implementations29 Sep 2021 Dylan M. Paiton, David Schultheiss, Matthias Kuemmerer, Zac Cranko, Matthias Bethge

We undertake analysis to characterize the geometry of the boundary, which is more curved within the adversarial subspace than within a random subspace of equal dimensionality.

Generalised Lipschitz Regularisation Equals Distributional Robustness

no code implementations11 Feb 2020 Zac Cranko, Zhan Shi, Xinhua Zhang, Richard Nock, Simon Kornblith

The problem of adversarial examples has highlighted the need for a theory of regularisation that is general enough to apply to exotic function classes, such as universal approximators.

Certifying Distributional Robustness using Lipschitz Regularisation

no code implementations25 Sep 2019 Zac Cranko, Zhan Shi, Xinhua Zhang, Simon Kornblith, Richard Nock

Distributional robust risk (DRR) minimisation has arisen as a flexible and effective framework for machine learning.

Proper-Composite Loss Functions in Arbitrary Dimensions

no code implementations19 Feb 2019 Zac Cranko, Robert C. Williamson, Richard Nock

The study of a machine learning problem is in many ways is difficult to separate from the study of the loss function being used.

Density Estimation

Lipschitz Networks and Distributional Robustness

no code implementations4 Sep 2018 Zac Cranko, Simon Kornblith, Zhan Shi, Richard Nock

Robust risk minimisation has several advantages: it has been studied with regards to improving the generalisation properties of models and robustness to adversarial perturbation.

Integral Privacy for Sampling

1 code implementation13 Jun 2018 Hisham Husain, Zac Cranko, Richard Nock

Privacy enforces an information theoretic barrier on approximation, and we show how to reach this barrier with guarantees on the approximation of the target non private density.

Density Estimation Fairness

Monge blunts Bayes: Hardness Results for Adversarial Training

no code implementations8 Jun 2018 Zac Cranko, Aditya Krishna Menon, Richard Nock, Cheng Soon Ong, Zhan Shi, Christian Walder

A key feature of our result is that it holds for all proper losses, and for a popular subset of these, the optimisation of this central measure appears to be independent of the loss.

Boosted Density Estimation Remastered

no code implementations22 Mar 2018 Zac Cranko, Richard Nock

There has recently been a steady increase in the number iterative approaches to density estimation.

Density Estimation Generative Adversarial Network

f-GANs in an Information Geometric Nutshell

1 code implementation NeurIPS 2017 Richard Nock, Zac Cranko, Aditya Krishna Menon, Lizhen Qu, Robert C. Williamson

In this paper, we unveil a broad class of distributions for which such convergence happens --- namely, deformed exponential families, a wide superset of exponential families --- and show tight connections with the three other key GAN parameters: loss, game and architecture.

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