Search Results for author: Tshilidzi Marwala

Found 26 papers, 2 papers with code

Healing Gaussian Process Experts

no code implementations ICML 2020 samuel cohen, Rendani Mbuvha, Tshilidzi Marwala, Marc Deisenroth

Gaussian processes (GPs) are nonparametric Bayesian models that have been applied to regression and classification problems.

Gaussian Processes General Classification +2

MphayaNER: Named Entity Recognition for Tshivenda

1 code implementation8 Apr 2023 Rendani Mbuvha, David I. Adelani, Tendani Mutavhatsindi, Tshimangadzo Rakhuhu, Aluwani Mauda, Tshifhiwa Joshua Maumela, Andisani Masindi, Seani Rananga, Vukosi Marivate, Tshilidzi Marwala

Named Entity Recognition (NER) plays a vital role in various Natural Language Processing tasks such as information retrieval, text classification, and question answering.

Information Retrieval named-entity-recognition +6

Imputation of Missing Streamflow Data at Multiple Gauging Stations in Benin Republic

no code implementations17 Nov 2022 Rendani Mbuvha, Julien Yise Peniel Adounkpe, Wilson Tsakane Mongwe, Mandela Houngnibo, Nathaniel Newlands, Tshilidzi Marwala

We show by simulating missingness in a testing period that GESS forecasts have a significant bias that results in low predictive skill over the ten Beninese stations.

Decision Making Imputation +3

Nano Version Control and Robots of Robots: Data Driven, Regenerative Production Code

no code implementations10 Oct 2021 Lukasz Machowski, Tshilidzi Marwala

By using agent-based simulation and NanoVC repos for agent arbitration, we are able to create a simulated environment where patterns developed by people are used to transform working prototypes into templates that data can be fed through to create the robots that create the production code.

Antithetic Riemannian Manifold And Quantum-Inspired Hamiltonian Monte Carlo

no code implementations5 Jul 2021 Wilson Tsakane Mongwe, Rendani Mbuvha, Tshilidzi Marwala

The Riemannian Manifold Hamiltonian Monte Carlo algorithm improves on Hamiltonian Monte Carlo by taking into account the local geometry of the target, which is beneficial for target densities that may exhibit strong correlations in the parameters.

Predicting Higher Education Throughput in South Africa Using a Tree-Based Ensemble Technique

no code implementations12 Jun 2021 Rendani Mbuvha, Patience Zondo, Aluwani Mauda, Tshilidzi Marwala

We use gradient boosting machines and logistic regression to predict academic throughput at a South African university.

regression

Healing Products of Gaussian Processes

1 code implementation14 Feb 2021 samuel cohen, Rendani Mbuvha, Tshilidzi Marwala, Marc Peter Deisenroth

Gaussian processes (GPs) are nonparametric Bayesian models that have been applied to regression and classification problems.

Gaussian Processes General Classification +2

An Automatic Relevance Determination Prior Bayesian Neural Network for Controlled Variable Selection

no code implementations6 Jan 2020 Rendani Mbuvha, Illyes Boulkaibet, Tshilidzi Marwala

We present an Automatic Relevance Determination prior Bayesian Neural Network(BNN-ARD) weight l2-norm measure as a feature importance statistic for the model-x knockoff filter.

Feature Importance Variable Selection

Relative Net Utility and the Saint Petersburg Paradox

no code implementations21 Oct 2019 Daniel Muller, Tshilidzi Marwala

Over the years, many economic theories were developed to resolve the paradox and explain gaps in the economic value theory in the evaluation of economic decisions, the subjective utility of the expected outcomes, and risk aversion as observed in the game of the St. Petersburg Paradox.

Decision Making

Relative rationality: Is machine rationality subjective?

no code implementations13 Feb 2019 Tshilidzi Marwala

Rationality has two elements and these are the use of relevant information and the efficient processing of such information.

Decision Making

Can rationality be measured?

no code implementations25 Dec 2018 Tshilidzi Marwala

Rationality is defined as the use of complete information, which is processed with a perfect biological or physical brain, in an optimized fashion.

Decision Making

The limit of artificial intelligence: Can machines be rational?

no code implementations16 Dec 2018 Tshilidzi Marwala

This paper studies the question on whether machines can be rational.

Creativity and Artificial Intelligence: A Digital Art Perspective

no code implementations21 Jul 2018 Bo Xing, Tshilidzi Marwala

There are generally three types of artificial intelligence and these are machine learning, evolutionary programming and soft computing.

BIG-bench Machine Learning

Blockchain and Artificial Intelligence

no code implementations13 Feb 2018 Tshilidzi Marwala, Bo Xing

It is undeniable that artificial intelligence (AI) and blockchain concepts are spreading at a phenomenal rate.

Rational Choice and Artificial Intelligence

no code implementations29 Mar 2017 Tshilidzi Marwala

The theory of rational choice assumes that when people make decisions they do so in order to maximize their utility.

Artificial Intelligence and Economic Theories

no code implementations20 Mar 2017 Tshilidzi Marwala, Evan Hurwitz

This book studies the impact of artificial intelligence on economic theories, a subject that has not been extensively studied.

counterfactual

Missing Data Estimation in High-Dimensional Datasets: A Swarm Intelligence-Deep Neural Network Approach

no code implementations1 Jul 2016 Collins Leke, Tshilidzi Marwala

This deep learning technique is then used as part of the objective function for the swarm intelligence technique in order to estimate the missing data after a supervised fine-tuning phase by minimizing an error function based on the interrelationship and correlation between features in the dataset.

Deep Learning

Proposition of a Theoretical Model for Missing Data Imputation using Deep Learning and Evolutionary Algorithms

no code implementations4 Dec 2015 Collins Leke, Tshilidzi Marwala, Satyakama Paul

In this article, considering arbitrary and monotone missing data patterns, we hypothesize that the use of deep neural networks built using autoencoders and denoising autoencoders in conjunction with genetic algorithms, swarm intelligence and maximum likelihood estimator methods as novel data imputation techniques will lead to better imputed values than existing techniques.

Decision Making Denoising +2

Artificial Intelligence and Asymmetric Information Theory

no code implementations10 Oct 2015 Tshilidzi Marwala, Evan Hurwitz

When human agents come together to make decisions, it is often the case that one human agent has more information than the other.

Causal Model Analysis using Collider v-structure with Negative Percentage Mapping

no code implementations16 Sep 2015 Pramod Kumar Parida, Tshilidzi Marwala, Snehashish Chakraverty

A major problem of causal inference is the arrangement of dependent nodes in a directed acyclic graph (DAG) with path coefficients and observed confounders.

Causal Inference

Rational Counterfactuals

no code implementations8 Apr 2014 Tshilidzi Marwala

This paper introduces the concept of rational countefactuals which is an idea of identifying a counterfactual from the factual (whether perceived or real) that maximizes the attainment of the desired consequent.

counterfactual Decision Making

Applying the Negative Selection Algorithm for Merger and Acquisition Target Identification

no code implementations10 Aug 2013 Satyakama Paul, Andreas Janecek, Fernando Buarque de Lima Neto, Tshilidzi Marwala

In this paper, we propose a new methodology based on the Negative Selection Algorithm that belongs to the field of Computational Intelligence, specifically, Artificial Immune Systems to identify takeover targets.

Flexibly-bounded Rationality and Marginalization of Irrationality Theories for Decision Making

no code implementations9 Jun 2013 Tshilidzi Marwala

Rational decision making involves using information which is almost always imperfect and incomplete together with some intelligent machine which if it is a human being is inconsistent to make decisions.

Decision Making

Semi-bounded Rationality: A model for decision making

no code implementations26 May 2013 Tshilidzi Marwala

Rational decision making involves using information which is almost always imperfect and incomplete as well as some intelligent machine which if it is a human being is inconsistent to make decisions.

Decision Making Missing Values

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