May 17, 2020

Meet the new StarCraft II Grandmaster: DeepMind’s AlphaStar

Sport Technology
Machine Learning
William Smith
2 min
Virtual reality
Artificial Intelligence company DeepMind has announced that its AlphaStar AI has reached the highest level of play in esport StarCraft II.

The latest i...

Artificial Intelligence company DeepMind has announced that its AlphaStar AI has reached the highest level of play in esport StarCraft II.

The latest in a series of milestones achieved by the company, the news comes after DeepMind’s AlphaGo won a best-of-five against Go world champion Lee Sedol, before AlphaStar beat a professional StarCraft II player earlier this year. This latest development has seen AlphaStar playing against versions of itself to achieve Grandmaster ranking, denoting the top competitive league of StarCraft II when played as an esport. The AI is now ranked above 99.8% of other players.

The result is remarkable owing to the complexity of a game such as StarCraft II when compared with Go, and was accordingly published in the scientific paper Nature. For one, the game is played in real time rather than in turns, with there being no steady state of play to consider and then act upon. There’s also a vast array of actions possible at any time - up to 1026 according to DeepMind.


The AI was trained via an array of machine learning techniques including neural networks and reinforcement and imitation learning. Breaking down the jargon, AlphaStar essentially played versions of itself in different configurations, some intentionally weakened and known as “Exploiters”, learning each time.

AlphaStar does not win owing simply to an inhuman speed of operations; indeed, the AI is limited to a human-comparable frequency of actions. Neither is it able to see more of the game at any moment, restricted by a moveable camera viewpoint just as a human player is. Instead, AlphaStar competes on a level playing field.

Dario “TLO” Wünsch, a professional player of the game, described AlphaStar’s play as follows: “I’ve found AlphaStar’s gameplay incredibly impressive – the system is very skilled at assessing its strategic position, and knows exactly when to engage or disengage with its opponent. And while AlphaStar has excellent and precise control, it doesn’t feel superhuman – certainly not on a level that a human couldn’t theoretically achieve. Overall, it feels very fair – like it is playing a ‘real’ game of StarCraft.”

(Image: Blizzard)

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Jul 14, 2021

Discord buys Sentropy to fight against hate and abuse online

2 min
Sentropy is joining Discord to continue fighting against hate and abuse on the internet

Discord, a popular chat app, has acquired the software company Sentropy to bolster its efforts to combat online abuse and harassment. Sentropy, monitors online networks for abuse and harassment, then offers users a way to block problematic people and filter out messages they don’t want to see.

First launched in 2015 and currently boasting 150 million monthly active users, Discord plans to integrate Sentropy’s own products into its existing toolkit and the company will also bring the smaller company’s leadership group aboard. Discord currently uses a “multilevel” approach to moderation, and a Trust and Safety (T&S) team dedicated to protecting users and shaping content moderation policies comprised 15% of Discord’s workforce as of May 2020.

“T&S tech and processes should not be used as a competitive advantage,” Sentropy CEO John Redgrave said in a blog post on the announcement. “We all deserve digital and physical safety, and moderators deserve better tooling to help them do one of the hardest jobs online more effectively and with fewer harmful impacts.”


Cleanse platforms of online harassment and abuse


Redgrave elaborated on the company’s natural connection with Discord: “Discord represents the next generation of social companies — a generation where users are not the product to be sold, but the engine of connectivity, creativity, and growth. In this model, user privacy and user safety are essential product features, not an afterthought. The success of this model depends upon building next-generation Trust and Safety into every product. We don’t take this responsibility lightly and are humbled to work at the scale of Discord and with Discord’s resources to increase the depth of our impact.”

Sentropy launched out of stealth last summer with an AI system designed to detect, track and cleanse platforms of online harassment and abuse. The company emerged then with $13 million in funding from notable backers including Reddit co-founder Alexis Ohanian and his VC firm Initialized Capital, King River Capital, Horizons Ventures and Playground Global.

“We are excited to help Discord decide how we can most effectively share with the rest of the Internet the best practices, technology, and tools that we’ve developed to protect our own communities,” Redgrave said.


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