Search Results for author: Terence L. Van Zyl

Found 14 papers, 3 papers with code

A Learnheuristic Approach to A Constrained Multi-Objective Portfolio Optimisation Problem

1 code implementation13 Apr 2023 Sonia Bullah, Terence L. Van Zyl

The results of this study show that, despite taking significantly longer to run to completion, the learnheuristic algorithms outperform the baseline algorithms in terms of hypervolume and rate of convergence.

Late Meta-learning Fusion Using Representation Learning for Time Series Forecasting

no code implementations20 Mar 2023 Terence L. Van Zyl

However, a unified taxonomy for model fusion and an empirical comparison of these hybrid and feature-based stacking ensemble approaches is still missing.

Meta-Learning Representation Learning +2

Towards a methodology for addressing missingness in datasets, with an application to demographic health datasets

no code implementations5 Nov 2022 Gift Khangamwa, Terence L. Van Zyl, Clint J. van Alten

Our study's contribution is a methodology for tackling missing data problems using a combination of synthetic dataset generation, missing data imputation and deep learning methods to resolve missing data challenges.

Decision Making Imputation

Exploring the effectiveness of surrogate-assisted evolutionary algorithms on the batch processing problem

no code implementations31 Oct 2022 Mohamed Z. Variawa, Terence L. Van Zyl, Matthew Woolway

The results also highlight the need to tune the hyper-parameters used by the surrogate-assisted framework, as the surrogate, in some instances, shows some deterioration over the baseline algorithm.

Evolutionary Algorithms

Multi-Modal Recommendation System with Auxiliary Information

no code implementations13 Oct 2022 Mufhumudzi Muthivhi, Terence L. Van Zyl, Hairong Wang

Context-aware recommendation systems improve upon classical recommender systems by including, in the modelling, a user's behaviour.

Recommendation Systems

Pareto Driven Surrogate (ParDen-Sur) Assisted Optimisation of Multi-period Portfolio Backtest Simulations

1 code implementation13 Sep 2022 Terence L. Van Zyl, Matthew Woolway, Andrew Paskaramoorthy

Portfolio management is a multi-period multi-objective optimisation problem subject to a wide range of constraints.

Management

Knowledge Graph Fusion for Language Model Fine-tuning

no code implementations21 Jun 2022 Nimesh Bhana, Terence L. Van Zyl

Language Models such as BERT have grown in popularity due to their ability to be pre-trained and perform robustly on a wide range of Natural Language Processing tasks.

Language Modelling Semantic Similarity +1

Surrogate Assisted Evolutionary Multi-objective Optimisation applied to a Pressure Swing Adsorption system

no code implementations28 Mar 2022 Liezl Stander, Matthew Woolway, Terence L. Van Zyl

We further find that combining a Genetic Algorithm framework with Machine Learning Surrogate models as a substitute for long-running simulation models yields significant computational efficiency improvements, 1. 7 - 1. 84 times speedup for the increased complexity examples and a 2. 7 times speedup for the Pressure Swing Adsorption system.

BIG-bench Machine Learning Computational Efficiency +1

Fusion of Sentiment and Asset Price Predictions for Portfolio Optimization

no code implementations10 Mar 2022 Mufhumudzi Muthivhi, Terence L. Van Zyl

This paper aims to unpack and develop an enhanced understanding of the sentiment aware portfolio selection problem.

Portfolio Optimization Stock Price Prediction

A Statistics and Deep Learning Hybrid Method for Multivariate Time Series Forecasting and Mortality Modeling

1 code implementation16 Dec 2021 Thabang Mathonsi, Terence L. Van Zyl

Difficulties with applying hybrid forecast methods to multivariate data include ($i$) the high computational cost involved in hyperparameter tuning for models that are not parsimonious, ($ii$) challenges associated with auto-correlation inherent in the data, as well as ($iii$) complex dependency (cross-correlation) between the covariates that may be hard to capture.

Multivariate Time Series Forecasting Prediction Intervals +1

Incremental Class Learning using Variational Autoencoders with Similarity Learning

no code implementations4 Oct 2021 Jiahao Huo, Terence L. Van Zyl

We show that one does not require stored images (exemplars) for incremental learning with similarity learning.

Incremental Learning Metric Learning

Feature-weighted Stacking for Nonseasonal Time Series Forecasts: A Case Study of the COVID-19 Epidemic Curves

no code implementations19 Aug 2021 Pieter Cawood, Terence L. Van Zyl

We investigate ensembling techniques in forecasting and examine their potential for use in nonseasonal time-series similar to those in the early days of the COVID-19 pandemic.

Time Series Time Series Analysis

Deep Similarity Learning for Sports Team Ranking

no code implementations25 Mar 2021 Daniel Yazbek, Jonathan Sandile Sibindi, Terence L. Van Zyl

Six models were developed and compared, a LightGBM, a XGBoost, a LightGBM (Contrastive Loss), LightGBM (Triplet Loss), a XGBoost (Contrastive Loss), XGBoost (Triplet Loss).

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