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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 Globe and Mail - Sports

AITopics Original Links

Hoop dreams come alive at Prince Rupert's all-native tournament Kevin Durant still loves Oklahoma City despite fans' frustrations Oakland Raiders' proposed Las Vegas stadium still lacks financing Frederik Andersen looks refreshed, even in Leafs' loss to Blues A'dream come true' for UAE woman skating with Capitals Daniel Sedin's two points help lift Canucks past Blue Jackets Betty Stanhope-Cole was a fiercely competitive golfer with a'perfect' swing Jets coach Maurice'glad' Pavelec pulled himself from game after injury Under Armour-sponsored athletes oppose CEO's pro-Trump comments RELATED Denis Shapovalov hits official with ball, Britain tops Canada in Davis Cup RELATED'Ashamed' Denis Shapovalov fined $7,000 for striking umpire with ball RELATED Canadian tennis prospect Shapovalov getting accustomed to pro life RELATED'Ashamed' Denis Shapovalov fined $7,000 for striking umpire with ball'Ashamed' Denis Shapovalov fined $7,000 for striking umpire with ball Hoop dreams come alive ...


Fore at last, fore at last: Golf returns to Bay State

Boston Herald

"Golf" has become a fore-letter word during the coronavirus pandemic. Astoundingly, it is no longer a crime in Massachusetts. Tom Brady left the Bay State to tee it up with the Tampa Bay Buccaneers and his old playing partner Rob Gronkowski. But Before Brady & Gronk start the 2020 NFL season at New Orleans, Brady will be playing 18 holes with Phil Mickelson against Tiger Woods and Peyton Manning on Sunday, May 24, in part to raise $10 million-and-counting for various COVID-19-related charities. The Match II – or as it is officially known, "The Match: Champions for Charity" – will take place at Medalist Golf Club in Hobe Sound, Florida, without spectators but within social distancing guidelines.


Why It Matters That NASCAR Banned the Confederate Flag

Slate

In this week's episode of Slate's sports podcast Hang Up and Listen, Joel Anderson, Stefan Fatsis, and Josh Levin talk about the NBA players who are pushing back against the idea of restarting the season. They also discuss how college football players are banding together to demand changes at their schools. And Clinton Yates of the Undefeated joins for a conversation about NASCAR banning the Confederate flag. Hang Up and Listen's weekly Elias Bowies: Joel's Elias Bowie: It's past time that the University of Texas honor the great Julius Whittier. Josh's Elias Bowie: Why have the Chicago White Sox been so slow to support the Black Lives Matter movement?