AI Poker Gamer Defeats Top Poker Players in the World

Facebook and CMU's poker AI beat five pros at once

The list of Poker players includes Jimmy Chou, Seth Davies, Michael Gagliano, Anthony Gregg, Dong Kim, Jason Les, Linus Loeliger, Daniel McAulay, Nick Pietrangelo, Sean Ruane, Trevor Savage, and Jake Toole.

A research paper describing the way Pluribus was made, has been published today by the journal Science. But in a game with more than two players, playing Nash equilibrium can be a losing strategy, so Pluribus has to consistently outplay its opponents.

Pluribus registered a solid win with statistical significance, which is particularly impressive given its opposition, Elias said. Designed by researchers from Facebook's AI lab and Carnegie Mellon, it played over 10,000 hands of poker against five pros-all of whom have won at least $1 million during their poker careers-winning a virtual $48,000.

Apart from Pluribus, there are other AI as well that have gained mastery over zero-sum games such as checkers, chess, Go, two-player poker, StarCraft 2, and Dota 2.

What Libratus did was to go back four moves for every player move and try to reason why they would play the way they did. That makes it both a tougher AI challenge and more relevant to many real-world problems involving multiple parties and missing information. So, Pluribus chewed up the best games of those world-class players and spat them out.

Once in a game with humans, Pluribus would keep looking ways to improve on that baseline, or "blueprint" strategy. "In a game that will, more often than not, reward you when you exhibit mental discipline, focus, and consistency, and certainly punish you when you lack any of the three, competing for hours on end against an AI bot that obviously doesn't have to worry about these shortcomings is a gruelling task". For a start, Pluribus has an online search algorithm to look for ahead for options.

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Pluribus considers only five possible continuation strategies each opponent and itself might adopt for the rest of the game. Claudico played through 80,000 hands in the course of two weeks, but he fell short of achieving a convincing victory, which judges said could have been thanks to luck.

The AI bot was trained in just eight days with the use of a 64-core server, less than 512 GB of RAM, and no GPUs. Sandholm is a Professor in the Carnegie Computer Science Department and also Director of the Electronic Marketplaces Laboratory.

Conversely, a part of the odd strategies of the AI included the so-called practice of donk betting whereby the AI purposefully called one hand, but raised the one right after it.

If built upon, the algorithms found in Pluribus could also be applied to self-driving vehicle routing, Wall Street trading, cybersecurity, and more. However, given how devastating Facebook's Pluribus AI can be at the poker table, these players may want to reassess the validity of their accusations. They were paid $2,000 each and whichever did better than the other against the AI received an additional $2,000.

According to the report from Facebook AI Research Scientist Noam Brown, the code manages an average win of $5 per hand.

Pluribus training cost is the equivalent of less than $150 worth of cloud computing resources compared to other recent AI milestone projects, which required the equivalent of millions of dollars' worth of computing resources to train. The 13 pros who played against an individual Pluribus divided $50,000, depending on their performance.

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