From The BBC
12th March 2016
A computer program has beaten a master Go player 3-0 in a best-of-five competition, in what is seen as a landmark moment for artificial intelligence. Google's AlphaGo program was playing against Lee Se-dol in Seoul, in South Korea. Mr Lee had been confident he would win before the competition started. The Chinese board game is considered to be a much more complex challenge for a computer than chess. "AlphaGo played consistently from beginning to the end while Lee, as he is only human, showed some mental vulnerability," one of Lee's former coaches, Kwon Kap-Yong, told the AFP news agency.
In the first game of the series, AlphaGo triumphed by a very narrow margin - Mr Lee had led for most of the match, but AlphaGo managed to build up a strong lead in its closing stages. After losing the second match to Deep Mind, Lee Se-dol said he was "speechless" adding that the AlphaGo machine played a "nearly perfect game". The two experts who provided commentary for the YouTube stream of for the third game said that it had been a complicated match to follow. They said that Lee Se-dol had brought his "top game" but that AlphaGo had won "in great style".
The AlphaGo system was developed by British computer company DeepMind which was bought by Google in 2014. It has built up its expertise by studying older games and teasing out patterns of play. And, according to DeepMind chief executive Demis Hassabis, it has also spent a lot of time just playing the game. "It played itself, different versions of itself, millions and millions of times and each time got incrementally slightly better - it learns from its mistakes," he told the BBC before the matches started. This virtuous circle of constant improvement meant the super computer went into the five-match series stronger than when it beat the European champion late last year.
Artificial Intelligence (AI) has flirted with games since its beginnings, because only smart humans excel. Unlike the real world, a closed system of fixed rules suits computing. Despite critical voices, Arthur Samuel's draughts playing program was an incredible achievement in 1959. Like AlpahGo it learned by playing itself repeatedly only many orders of magnitude slower. Then the goal posts moved. The critics said chess was beyond computing's capability because it needed human intuition and creativity. But then when good amateur challengers had to eat their words in the 1970s, the goal post shifted again.
Critics claimed a horizon where computers might beat some professionals but certainly not grand masters. So when IBM's Deep Blue supercomputer beat world champion Garry Kasparov in 1997, the world was astonished. But Deep Blue was not the human-like intelligence that the founding fathers of AI had hoped for. It won by brute force by searching through millions of moves in seconds. Humans have limited memory and need brilliant pattern perception and creative strategies to win.
So the critics turned to Go as the impossible. Even with today's vast computer memories and incredibly fast processors (which have doubled more than eight times since Deep Blue), the ancient game will not yield to brute force. The size of the search required for Go is larger than chess by more than the number of atoms in the universe. It is the holy grail of AI gaming. When Facebook announced earlier this year that their program had beaten a strong Go amateur, jaws dropped in the AI community - and fell to the floor that same day when Google's Deep Mind genius team announced their AlphaGo beat the European champion 5-0.
To beat one of the world's top players, Deep Mind used a mixture of clever strategies to make the search much smaller. They trained their machine on 30 million expert moves to start with, and then the learning machine played against itself millions of times. It worked - the holy grail is in the bag and the goal posts can shift no further.
Does this mean AI is now smarter than us and will kill us mere humans? Certainly not. AlphaGo doesn't care if it wins or looses. It doesn't even care if it plays and it certainly couldn't make you a cup of tea after the game. Does it mean that AI will soon take your job? Possibly you should be more worried about that.
[…and Judgement Day just edges just a little bit closer…..]
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