no code implementations • 9 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.
2 code implementations • 24 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.
no code implementations • 9 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.
no code implementations • 18 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.
no code implementations • 25 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.
no code implementations • 7 Jan 2018 • John Mitro, Derek Bridge, Steven Prestwich
We show that after applying (DDL) the reconstruction of the original data point from a noisy
1 code implementation • 6 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.
no code implementations • 24 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.
no code implementations • 28 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.
1 code implementation • 20 Feb 2014 • Roberto Rossi, Steven Prestwich, S. Armagan Tarim
We introduce statistical constraints, a declarative modelling tool that links statistics and constraint programming.
1 code implementation • 5 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
no code implementations • 9 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.