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.
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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?
"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.