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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.


Sports jumps on PPP bandwagon, but big leagues take a pass

FOX News

Fox News Flash top headlines are here. Check out what's clicking on Foxnews.com. Rapper Ice Cube, Republican Ohio Gov. Mike DeWine and longtime boxing promoter Bob Arum led a cavalcade of sports leagues, federations, businesses and teams that navigated a federal loan program designed to help small firms cope with the economic impact of the coronavirus pandemic. Data released Monday showed hundreds of thousands of Paycheck Protection Program recipients across a wide range of industries, and sports-related businesses were well represented. However, none of the four major North American sports leagues -- the NFL, NBA, NHL and Major League Baseball -- were among the businesses that applied, according to the data.