Search Results for author: Lewis Smith

Found 17 papers, 6 papers with code

Simple and Scalable Epistemic Uncertainty Estimation Using a Single Deep Deterministic Neural Network

no code implementations ICML 2020 Joost van Amersfoort, Lewis Smith, Yee Whye Teh, Yarin Gal

We propose a method for training a deterministic deep model that can find and reject out of distribution data points at test time with a single forward pass.

Uncertainty Quantification

Improving Dictionary Learning with Gated Sparse Autoencoders

no code implementations24 Apr 2024 Senthooran Rajamanoharan, Arthur Conmy, Lewis Smith, Tom Lieberum, Vikrant Varma, János Kramár, Rohin Shah, Neel Nanda

Recent work has found that sparse autoencoders (SAEs) are an effective technique for unsupervised discovery of interpretable features in language models' (LMs) activations, by finding sparse, linear reconstructions of LM activations.

Can convolutional ResNets approximately preserve input distances? A frequency analysis perspective

no code implementations4 Jun 2021 Lewis Smith, Joost van Amersfoort, Haiwen Huang, Stephen Roberts, Yarin Gal

ResNets constrained to be bi-Lipschitz, that is, approximately distance preserving, have been a crucial component of recently proposed techniques for deterministic uncertainty quantification in neural models.

Uncertainty Quantification valid

On Feature Collapse and Deep Kernel Learning for Single Forward Pass Uncertainty

2 code implementations22 Feb 2021 Joost van Amersfoort, Lewis Smith, Andrew Jesson, Oscar Key, Yarin Gal

Inducing point Gaussian process approximations are often considered a gold standard in uncertainty estimation since they retain many of the properties of the exact GP and scale to large datasets.

Gaussian Processes General Classification

Galaxy Zoo DECaLS: Detailed Visual Morphology Measurements from Volunteers and Deep Learning for 314,000 Galaxies

1 code implementation16 Feb 2021 Mike Walmsley, Chris Lintott, Tobias Geron, Sandor Kruk, Coleman Krawczyk, Kyle W. Willett, Steven Bamford, Lee S. Kelvin, Lucy Fortson, Yarin Gal, William Keel, Karen L. Masters, Vihang Mehta, Brooke D. Simmons, Rebecca Smethurst, Lewis Smith, Elisabeth M. Baeten, Christine Macmillan

All classifications are used to train an ensemble of Bayesian convolutional neural networks (a state-of-the-art deep learning method) to predict posteriors for the detailed morphology of all 314, 000 galaxies.

Variational Deterministic Uncertainty Quantification

no code implementations1 Jan 2021 Joost van Amersfoort, Lewis Smith, Andrew Jesson, Oscar Key, Yarin Gal

Building on recent advances in uncertainty quantification using a single deep deterministic model (DUQ), we introduce variational Deterministic Uncertainty Quantification (vDUQ).

Causal Inference regression +1

Semi-supervised Learning of Galaxy Morphology using Equivariant Transformer Variational Autoencoders

no code implementations17 Nov 2020 Mizu Nishikawa-Toomey, Lewis Smith, Yarin Gal

We show that this novel architecture leads to improvements in accuracy when used for the galaxy morphology classification task on the Galaxy Zoo data set.

General Classification Morphology classification

Capsule Networks -- A Probabilistic Perspective

no code implementations7 Apr 2020 Lewis Smith, Lisa Schut, Yarin Gal, Mark van der Wilk

'Capsule' models try to explicitly represent the poses of objects, enforcing a linear relationship between an object's pose and that of its constituent parts.

Object

Uncertainty Estimation Using a Single Deep Deterministic Neural Network

2 code implementations4 Mar 2020 Joost van Amersfoort, Lewis Smith, Yee Whye Teh, Yarin Gal

We propose a method for training a deterministic deep model that can find and reject out of distribution data points at test time with a single forward pass.

Out-of-Distribution Detection Uncertainty Quantification

Liberty or Depth: Deep Bayesian Neural Nets Do Not Need Complex Weight Posterior Approximations

no code implementations NeurIPS 2020 Sebastian Farquhar, Lewis Smith, Yarin Gal

We challenge the longstanding assumption that the mean-field approximation for variational inference in Bayesian neural networks is severely restrictive, and show this is not the case in deep networks.

Variational Inference

A Systematic Comparison of Bayesian Deep Learning Robustness in Diabetic Retinopathy Tasks

1 code implementation22 Dec 2019 Angelos Filos, Sebastian Farquhar, Aidan N. Gomez, Tim G. J. Rudner, Zachary Kenton, Lewis Smith, Milad Alizadeh, Arnoud de Kroon, Yarin Gal

From our comparison we conclude that some current techniques which solve benchmarks such as UCI `overfit' their uncertainty to the dataset---when evaluated on our benchmark these underperform in comparison to simpler baselines.

Out-of-Distribution Detection

Flood Detection On Low Cost Orbital Hardware

no code implementations4 Oct 2019 Gonzalo Mateo-Garcia, Silviu Oprea, Lewis Smith, Josh Veitch-Michaelis, Guy Schumann, Yarin Gal, Atılım Güneş Baydin, Dietmar Backes

Satellite imaging is a critical technology for monitoring and responding to natural disasters such as flooding.

Galaxy Zoo: Probabilistic Morphology through Bayesian CNNs and Active Learning

1 code implementation17 May 2019 Mike Walmsley, Lewis Smith, Chris Lintott, Yarin Gal, Steven Bamford, Hugh Dickinson, Lucy Fortson, Sandor Kruk, Karen Masters, Claudia Scarlata, Brooke Simmons, Rebecca Smethurst, Darryl Wright

We use Bayesian convolutional neural networks and a novel generative model of Galaxy Zoo volunteer responses to infer posteriors for the visual morphology of galaxies.

Active Learning

Understanding Measures of Uncertainty for Adversarial Example Detection

1 code implementation22 Mar 2018 Lewis Smith, Yarin Gal

Measuring uncertainty is a promising technique for detecting adversarial examples, crafted inputs on which the model predicts an incorrect class with high confidence.

General Classification

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