There were a few jokes made during the round about how AlphaGo resigns. Turns out it's just a popup window! http://i.imgur.com/WKWMHLv.png
Another angle - https://i.imgur.com/Pl7xPfk.jpg
Lee Sedol Beats AlphaGo in Game 4
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Re: Lee Sedol Beats AlphaGo in Game 4
#22Lee Sedol definitely did not look like he was in top form there. I would say (as an amateur) his play in Game 2 was far better. It was the funky clamp position that perhaps forced AlphaGo to start falling apart this game. [0] I wonder if Lee Sedol can find a way to replicate that in Game 5. [0]: https://twitter.com/demishassabis/status/708928006400581632
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Re: Lee Sedol Beats AlphaGo in Game 4
#23The game seemed to be going in AlphaGo's favour when it was half way through. Black (AG) had secured a large area on the top that seemed nearly impossible to invade.
It was amazing to see how Lee Sedol found the right moves to make the invasion work.
This makes me think that if the time for match was three hours instead of two, maybe a professional player will have enough time to read the board deeply enough to find the right moves.
Re: Lee Sedol Beats AlphaGo in Game 4
#24I wonder what the chances are of a cosmic ray or some stray radiation causing AlphaGo to have problems. It's quite a rare event, but when you have 1920 CPUs and 280 GPUs, it might up the probability enough to be something you have to worry about.
Re: Lee Sedol Beats AlphaGo in Game 4
#25Does this mean Lee found AlphaGo's weakness, and AlphaGo wasn't player at a out-of-reach level?
Re: Lee Sedol Beats AlphaGo in Game 4
#26I was hoping to see how AlphaGo would play in overtime. Now I'm curious, does it know how to play in overtime? Can the system handle evaluating how much time it can give itself to 'think' about each move, or does it fall into the halting problem territory and it was programmed to evaluate its probability of winning given the 'fixed' time it had left.
Re: Lee Sedol Beats AlphaGo in Game 4
#27That was really cool! It seemed after the brilliant play in the middle the most probable moves for winning required Lee Sedol to make impossibly bad mistakes for a professional, which would be a prior that AlphaGo doesn't incorporate. I've heard the training data was mostly amateur games so perhaps the value/policy networks were overfit? Or maybe greedily picking the highest probability, common with tree search approaches, is just suboptimal?
Re: Lee Sedol Beats AlphaGo in Game 4
#28There were a few jokes made during the round about how AlphaGo resigns. Turns out it's just a popup window! http://i.imgur.com/WKWMHLv.png
Yeah, I was worried that if the score ends up 5-0, we could never see how AlphaGo resigns. Good to see Lee Sedol's victory.
Re: Lee Sedol Beats AlphaGo in Game 4
#29I hope it won't turn out they let him win.
Hopefully they're not that disrespectful
Re: Lee Sedol Beats AlphaGo in Game 4
#30Was it AlphaGo losing the game, or Lee Sedol winning it?
Lee Sedol winning, and keeping his cool and not make any mistakes. AlphaGo, on the other hand, went bonker especially towards the end but it got into bad territory not because of silly mistakes but brilliant play by Lee Sedol.
Could it possibly be that both of the mistakes were bugs? Perhaps it suggested a non-sensical position such as (25.23, 13.15), and it was snapped to (19, 13) :D