Search Results for author: Alexandra Brintrup

Found 27 papers, 9 papers with code

Loss-Free Machine Unlearning

1 code implementation29 Feb 2024 Jack Foster, Stefan Schoepf, Alexandra Brintrup

Most existing machine unlearning approaches require a model to be fine-tuned to remove information while preserving performance.

Machine Unlearning

Parameter-tuning-free data entry error unlearning with adaptive selective synaptic dampening

no code implementations Preprint 2024 Stefan Schoepf, Jack Foster, Alexandra Brintrup

Second, we demonstrate the performance of ASSD in a supply chain delay prediction problem with labelling errors using real-world data where we randomly introduce various levels of labelling errors.

Model Editing

Zero-Shot Machine Unlearning at Scale via Lipschitz Regularization

2 code implementations2 Feb 2024 Jack Foster, Kyle Fogarty, Stefan Schoepf, Cengiz Öztireli, Alexandra Brintrup

The key challenge in unlearning is forgetting the necessary data in a timely manner, while preserving model performance.

Machine Unlearning

Coalitional Bargaining via Reinforcement Learning: An Application to Collaborative Vehicle Routing

no code implementations26 Oct 2023 Stephen Mak, Liming Xu, Tim Pearce, Michael Ostroumov, Alexandra Brintrup

Our contribution is that our decentralised approach is both scalable and considers the self-interested nature of companies.

reinforcement-learning

Fair collaborative vehicle routing: A deep multi-agent reinforcement learning approach

no code implementations26 Oct 2023 Stephen Mak, Liming Xu, Tim Pearce, Michael Ostroumov, Alexandra Brintrup

Our contribution is that we are the first to consider both the route allocation problem and gain sharing problem simultaneously - without access to the expensive characteristic function.

Multi-agent Reinforcement Learning reinforcement-learning

Towards Autonomous Supply Chains: Definition, Characteristics, Conceptual Framework, and Autonomy Levels

no code implementations13 Oct 2023 Liming Xu, Stephen Mak, Yaniv Proselkov, Alexandra Brintrup

Recognising that this work represents an initial endeavour, we emphasise the need for continued exploration in this emerging domain.

Reconstructing supply networks

no code implementations30 Sep 2023 Luca Mungo, Alexandra Brintrup, Diego Garlaschelli, François Lafond

Network reconstruction is a well-developed sub-field of network science, but it has only recently been applied to production networks, where nodes are firms and edges represent customer-supplier relationships.

Towards Robust Continual Learning with Bayesian Adaptive Moment Regularization

no code implementations15 Sep 2023 Jack Foster, Alexandra Brintrup

Continual learning seeks to overcome the challenge of catastrophic forgetting, where learning to solve new tasks causes a model to forget previously learnt information.

Continual Learning Split-MNIST

Fast Machine Unlearning Without Retraining Through Selective Synaptic Dampening

1 code implementation15 Aug 2023 Jack Foster, Stefan Schoepf, Alexandra Brintrup

We present Selective Synaptic Dampening (SSD), a novel two-step, post hoc, retrain-free approach to machine unlearning which is fast, performant, and does not require long-term storage of the training data.

Machine Unlearning

Unlocking Carbon Reduction Potential with Reinforcement Learning for the Three-Dimensional Loading Capacitated Vehicle Routing Problem

no code implementations22 Jul 2023 Stefan Schoepf, Stephen Mak, Julian Senoner, Liming Xu, Netland Torbjörn, Alexandra Brintrup

Our model not only represents a promising first step towards large-scale logistics optimisation with reinforcement learning but also lays the foundation for this research stream.

reinforcement-learning

Trustworthy, responsible, ethical AI in manufacturing and supply chains: synthesis and emerging research questions

no code implementations19 May 2023 Alexandra Brintrup, George Baryannis, Ashutosh Tiwari, Svetan Ratchev, Giovanna Martinez-Arellano, Jatinder Singh

While the increased use of AI in the manufacturing sector has been widely noted, there is little understanding on the risks that it may raise in a manufacturing organisation.

Do autoencoders need a bottleneck for anomaly detection?

no code implementations25 Feb 2022 Bang Xiang Yong, Alexandra Brintrup

Learning the identity function renders the AEs useless for anomaly detection.

Anomaly Detection

Bayesian autoencoders with uncertainty quantification: Towards trustworthy anomaly detection

no code implementations25 Feb 2022 Bang Xiang Yong, Alexandra Brintrup

Despite numerous studies of deep autoencoders (AEs) for unsupervised anomaly detection, AEs still lack a way to express uncertainty in their predictions, crucial for ensuring safe and trustworthy machine learning systems in high-stake applications.

Uncertainty Quantification Unsupervised Anomaly Detection

Coalitional Bayesian Autoencoders -- Towards explainable unsupervised deep learning

no code implementations19 Oct 2021 Bang Xiang Yong, Alexandra Brintrup

This paper aims to improve the explainability of Autoencoder's (AE) predictions by proposing two explanation methods based on the mean and epistemic uncertainty of log-likelihood estimate, which naturally arise from the probabilistic formulation of the AE called Bayesian Autoencoders (BAE).

Specificity

Will bots take over the supply chain? Revisiting Agent-based supply chain automation

no code implementations3 Sep 2021 Liming Xu, Stephen Mak, Alexandra Brintrup

For example, the ubiquity of IoT technology helps agents "sense" the state of affairs in a supply chain and opens up new possibilities for automation.

ERP Management

Bayesian Autoencoders for Drift Detection in Industrial Environments

1 code implementation28 Jul 2021 Bang Xiang Yong, Yasmin Fathy, Alexandra Brintrup

Autoencoders are unsupervised models which have been used for detecting anomalies in multi-sensor environments.

Multi Agent System for Machine Learning Under Uncertainty in Cyber Physical Manufacturing System

no code implementations28 Jul 2021 Bang Xiang Yong, Alexandra Brintrup

In this paper, we determine the sources of uncertainty in machine learning and establish the success criteria of a machine learning system to function well under uncertainty in a cyber-physical manufacturing system (CPMS) scenario.

BIG-bench Machine Learning

Bayesian Autoencoders: Analysing and Fixing the Bernoulli likelihood for Out-of-Distribution Detection

1 code implementation28 Jul 2021 Bang Xiang Yong, Tim Pearce, Alexandra Brintrup

After an autoencoder (AE) has learnt to reconstruct one dataset, it might be expected that the likelihood on an out-of-distribution (OOD) input would be low.

Out-of-Distribution Detection

Data Considerations in Graph Representation Learning for Supply Chain Networks

no code implementations22 Jul 2021 Ajmal Aziz, Edward Elson Kosasih, Ryan-Rhys Griffiths, Alexandra Brintrup

It is anticipated that our method will be directly applicable to businesses wishing to sever links with nefarious entities and mitigate risk of supply failure.

Graph Representation Learning Link Prediction

Supply Chain Digital Twin Framework Design: An Approach of Supply Chain Operations Reference Model and System of Systems

no code implementations19 Jul 2021 Jie Zhang, Alexandra Brintrup, Anisoara Calinescu, Edward Kosasih, Angira Sharma

This paper explains what is 'twined' in supply chain digital twin and how to 'twin' them to handle the spatio-temporal dynamic issue.

Understanding Softmax Confidence and Uncertainty

no code implementations9 Jun 2021 Tim Pearce, Alexandra Brintrup, Jun Zhu

It is often remarked that neural networks fail to increase their uncertainty when predicting on data far from the training distribution.

Out of Distribution (OOD) Detection

Digital Twins: State of the Art Theory and Practice, Challenges, and Open Research Questions

no code implementations2 Nov 2020 Angira Sharma, Edward Kosasih, Jie Zhang, Alexandra Brintrup, Anisoara Calinescu

This work explores the various DT features and current approaches, the shortcomings and reasons behind the delay in the implementation and adoption of digital twin.

Structured Weight Priors for Convolutional Neural Networks

1 code implementation12 Jul 2020 Tim Pearce, Andrew Y. K. Foong, Alexandra Brintrup

This paper explores the benefits of adding structure to weight priors.

Expressive Priors in Bayesian Neural Networks: Kernel Combinations and Periodic Functions

1 code implementation15 May 2019 Tim Pearce, Russell Tsuchida, Mohamed Zaki, Alexandra Brintrup, Andy Neely

A simple, flexible approach to creating expressive priors in Gaussian process (GP) models makes new kernels from a combination of basic kernels, e. g. summing a periodic and linear kernel can capture seasonal variation with a long term trend.

reinforcement-learning Reinforcement Learning (RL)

Uncertainty in Neural Networks: Approximately Bayesian Ensembling

2 code implementations12 Oct 2018 Tim Pearce, Felix Leibfried, Alexandra Brintrup, Mohamed Zaki, Andy Neely

Ensembling NNs provides an easily implementable, scalable method for uncertainty quantification, however, it has been criticised for not being Bayesian.

Bayesian Inference General Classification +2

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