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Topic Modeling with Wasserstein Autoencoders

arXiv.org Artificial Intelligence

We propose a novel neural topic model in the Wasserstein autoencoders (W AE) framework. Unlike existing variational autoencoder based models, we directly enforce Dirichlet prior on the latent document-topic vectors. We exploit the structure of the latent space and apply a suitable kernel in minimizing the Maximum Mean Discrepancy (MMD) to perform distribution matching. We discover that MMD performs much better than the Generative Adversarial Network (GAN) in matching high dimensional Dirichlet distribution. We further discover that incorporating randomness in the encoder output during training leads to significantly more coherent topics. To measure the diversity of the produced topics, we propose a simple topic uniqueness metric. Together with the widely used coherence measure NPMI, we offer a more wholistic evaluation of topic quality. Experiments on several real datasets show that our model produces significantly better topics than existing topic models.


The Application of Machine Learning Techniques for Predicting Results in Team Sport: A Review

arXiv.org Machine Learning

Over the past two decades, Machine Learning (ML) techniques have been increasingly utilized for the purpose of predicting outcomes in sport. In this paper, we provide a review of studies that have used ML for predicting results in team sport, covering studies from 1996 to 2019. We sought to answer five key research questions while extensively surveying papers in this field. This paper offers insights into which ML algorithms have tended to be used in this field, as well as those that are beginning to emerge with successful outcomes. Our research highlights defining characteristics of successful studies and identifies robust strategies for evaluating accuracy results in this application domain. Our study considers accuracies that have been achieved across different sports and explores the notion that outcomes of some team sports could be inherently more difficult to predict than others. Finally, our study uncovers common themes of future research directions across all surveyed papers, looking for gaps and opportunities, while proposing recommendations for future researchers in this domain.


BBC Sports Personality of the Year 2017: Meet the contenders

BBC News

Here is a rundown of the 12 contenders who have been shortlisted for the BBC Sports Personality of the Year 2017 award, to be presented on 17 December.


Cook & Beaumont among sports stars listed

BBC News

Former England cricket captain Alastair Cook and ex-England rugby union captain Bill Beaumont have been knighted in the Queen's New Year Honours list. Commonwealth Games Federation president Louise Martin is made a dame. Outgoing Premier League chairman Richard Scudamore and Geva Mentor, who helped England's netball team win Commonwealth Games gold, become CBEs. England boss Gareth Southgate and 2018 Tour de France winner Geraint Thomas are made OBEs. England captain and Tottenham striker Harry Kane is appointed an MBE.


Which sports still use 'walk-on girls'?

BBC News

"At odds with modern society" was Formula 1's reasoning for getting rid of grid girls for the upcoming car-racing season.