Search Results for author: Steven Prestwich

Found 12 papers, 4 papers with code

Electricity Price Forecasting in the Irish Balancing Market

no code implementations9 Feb 2024 Ciaran O'Connor, Joseph Collins, Steven Prestwich, Andrea Visentin

We compare statistical, machine learning, and deep learning models using a framework that investigates the impact of different training sizes.

Forecasting Workload in Cloud Computing: Towards Uncertainty-Aware Predictions and Transfer Learning

2 code implementations24 Feb 2023 Andrea Rossi, Andrea Visentin, Diego Carraro, Steven Prestwich, Kenneth N. Brown

Results show that modelling the uncertainty of predictions has a positive impact on performance, especially on service level metrics, because uncertainty quantification can be tailored to desired target service levels that are critical in cloud applications.

Cloud Computing Decision Making +3

A hybrid estimation of distribution algorithm for joint stratification and sample allocation

no code implementations9 Jan 2022 Mervyn O'Luing, Steven Prestwich, S. Armagan Tarim

In this study we propose a hybrid estimation of distribution algorithm (HEDA) to solve the joint stratification and sample allocation problem.

Combining K-means type algorithms with Hill Climbing for Joint Stratification and Sample Allocation Designs

no code implementations18 Aug 2021 Mervyn O'Luing, Steven Prestwich, S. Armagan Tarim

This is a combinatorial optimisation problem in which we search for the optimal stratification from the set of all possible stratifications of basic strata.

A Simulated Annealing Algorithm for Joint Stratification and Sample Allocation Designs

no code implementations25 Nov 2020 Mervyn O'Luing, Steven Prestwich, S. Armagan Tarim

We add, to the existing suite of local search algorithms, a simulated annealing algorithm that allows for an escape from local minima and uses delta evaluation to exploit the similarity between consecutive solutions, and thereby reduces the evaluation time.

Denoising Dictionary Learning Against Adversarial Perturbations

no code implementations7 Jan 2018 John Mitro, Derek Bridge, Steven Prestwich

We show that after applying (DDL) the reconstruction of the original data point from a noisy

Denoising Dictionary Learning

Declarative Statistics

1 code implementation6 Aug 2017 Roberto Rossi, Özgür Akgün, Steven Prestwich, S. Armagan Tarim

In this work we introduce declarative statistics, a suite of declarative modelling tools for statistical analysis.

Stochastic Constraint Programming as Reinforcement Learning

no code implementations24 Apr 2017 Steven Prestwich, Roberto Rossi, Armagan Tarim

Reinforcement Learning (RL) extends Dynamic Programming to large stochastic problems, but is problem-specific and has no generic solvers.

reinforcement-learning Reinforcement Learning (RL)

The BIN_COUNTS Constraint: Filtering and Applications

no code implementations28 Nov 2016 Roberto Rossi, Özgür Akgün, Steven Prestwich, Armagan Tarim

We show that BIN_COUNTS can be employed to develop a decomposition for the $\chi^2$ test constraint, a new statistical constraint that we introduce in this work.

Statistical Constraints

1 code implementation20 Feb 2014 Roberto Rossi, Steven Prestwich, S. Armagan Tarim

We introduce statistical constraints, a declarative modelling tool that links statistics and constraint programming.

Scheduling

Piecewise linear approximations of the standard normal first order loss function

1 code implementation5 Jul 2013 Roberto Rossi, S. Armagan Tarim, Steven Prestwich, Brahim Hnich

When the random variable of interest is normally distributed, the first order loss function can be easily expressed in terms of the standard normal cumulative distribution and probability density function.

Optimization and Control Probability

Confidence-based Reasoning in Stochastic Constraint Programming

no code implementations9 Oct 2011 Roberto Rossi, Brahim Hnich, S. Armagan Tarim, Steven Prestwich

In this work we introduce a novel approach, based on sampling, for finding assignments that are likely to be solutions to stochastic constraint satisfaction problems and constraint optimisation problems.

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