If robot Olympics were not entertaining enough, how about the robo chess championships? Google has created supreme algorithm AlphaGo Zero which reigns undefeated against the former world champion AI.
New research published on Cornell University’s ArXiv details how computer scientists from Google DeepMind improved their deep neural network enough to produce AI capable of “superhuman performance in many challenging domains” of chess and two other board games.
So who did AlphaZero Go defeat? The AI known as Stockfish 8 – also created at Google. The scientists refined search engine capability within existing neural networks by reducing the number of positions researched from tens of millions to tens of thousands. The improved deep neural network achieved the results with one minute or less of processing time per move.
Scientists emphasised the “tabula rasa reinforcement learning from games of self-play” as the AI’s most impressive quality. Little more than four hours after the neural network was taught the rules of chess, AlphaGo Zero had run enough scenarios of the game in its “mind” to outperform Stockfish; the new kid on the block won 28 games and drew the remaining 72.
AlphaGo Zero went on to vanquish leading AI Elmo in the game of Shogi, Japanese Chess. After only two hours of solitary training, Google’s algorithm won 90 out of 100 games, losing just eight times.
To the uninitiated, chess strategy may seem a simple case of learning patterns and knowing how to identify traps. Yet the true complexity of the game makes it an excellent scenario in which to test deep learning capability. As is oft-cited, there are more possible moves on a chessboard than there are atoms in the observable universe.
“The AlphaGo Zero program recently achieved superhuman performance in the game of Go, by tabula rasa reinforcement learning from games of self-play,” wrote authors David Silver, Thomas Hubert, Julian Schrittwieser etc.
“Starting from random play, and given no domain knowledge except the game rules, AlphaZero achieved within 24 hours a superhuman level of play.”
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Google declined to comment until the full research is published in another journal.
A younger AI, AlphaGo, triumphed against 3-times European Champion, Mr Fan Hui, during October 2015.
The 5-0 defeat was the first ever against a Go professional, and the details were published in the scientific journal, Nature. Google notes on its DeepMind blog that AlphaGo “somehow taught the world completely new knowledge” in several games of Go in Seoul, South Korea, March 2016.
Alongside the AlphaGo Zero project, a Machine Learning API named SC2LE invites developers of the world to craft an algorithm to win at Blizzard Entertainment’s Starcraft. The original game is already used by ML researchers, who compete annually in the AIIDE bot competition.
Artificial Intelligence can be trained to perform extremely well in a mathematically limited set of circumstances. The real challenge of “machine intelligence” is to create generalised knowledge which can be applied in multiple situations. Although AlphaGo Zero is not capable of cooking dinner (or even unpacking a chess set), the fact that the same algorithm succeeded at three different games – with a relatively short period of self-training time – is a major step for science.