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Lee Sedol Beats AlphaGo in Game 4

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Re: Lee Sedol Beats AlphaGo in Game 4

#161

Post by panic »

karussell wrote: post #145
mikeyouse wrote: post #11

Relevant tweets from Demis; Lee Sedol is playing brilliantly! #AlphaGo thought it was doing well, but got confused on move 87. We are in trouble now... Mistake was on move 79, but #AlphaGo only came to that realisation on around move 87 When I say 'thought' and 'realisation' I just mean the output of #AlphaGo value net. It was around 70% at move 79 and then dived on move 87 Lee Sedol wins game 4!!! Congratulations! H…

Just in case someone wants the commentary around this move 78 https://www.youtube.com/watch?v=yCALyQRN3hw&t=11413

Here's the Myungwan Kim commentary around that same move: https://www.youtube.com/watch?v=SMqjGNqfU6I&t=1h33m. He had been looking with Hajin Lee at variations involving the move beforehand (https://www.youtube.com/watch?v=SMqjGNqfU6I&t=1h28m1s), so he immediately noticed that AlphaGo made a possible error in its response.

Re: Lee Sedol Beats AlphaGo in Game 4

#162

Post by gort »

harshreality wrote: post #37
minimaxir wrote: post #4

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

The title bar looks like it's GoGui, so it's just GoGui's reaction to a Go Text Protocol resignation?

Looks like it, see:

https://github.com/lukaszlew/EasyGoGui/blob/master/src/net/s...

And search for MSG_RESIGN_2

Re: Lee Sedol Beats AlphaGo in Game 4

#163

Post by [deleted] »

mikeyouse wrote: post #11

Relevant tweets from Demis; Lee Sedol is playing brilliantly! #AlphaGo thought it was doing well, but got confused on move 87. We are in trouble now... Mistake was on move 79, but #AlphaGo only came to that realisation on around move 87 When I say 'thought' and 'realisation' I just mean the output of #AlphaGo value net. It was around 70% at move 79 and then dived on move 87 Lee Sedol wins game 4!!! Congratulations! H…

[deleted]

Re: Lee Sedol Beats AlphaGo in Game 4

#165

Post by throw_xyz111 »

antonioalegria wrote: post #157
runesoerensen wrote: post #123

Earlier quoted context omitted.

Don't post unfounded conspiracy theories if you don't want to sound like a conspiracy theorist.

A lot of comments here are unfounded. It was a thought I had that imo warrants some discussion (which you may disagree)

Agreed. 99% of the comments are just speculation - Yours is as good as any.

Re: Lee Sedol Beats AlphaGo in Game 4

#166

Post by fhe »

My friends and I (many of us are enthusiastic Go lovers/players) have been following all of the games closely. AlphaGo's mid game today was really strange. Many experts have praised Lee's move 78 as a "divine-inspired" move. While it was a complex setup, in terms of number of searches I can't see it be any more complex than the games before. Indeed because it was a very much a local fight, the number of possible moves were rather limited. As Lee said in the post-game conference, it was the only move that made any sense at all, as any other move would quickly prove to be fatal after half a dozen or so exchanges.

Of course, what's obvious to a human might not be so at all to a computer. And this is the interesting point that I hope the DeepMind researchers would shed some light on for all of us after they dig out what was going on inside AlphaGo at the time. And we'd also love to learn why did AlphaGo seem to go off the rails after this initial stumble and made a string of indecipherable moves thereafter.

Congrats to Lee and the DeepMind team! It was an exciting and I hope informative match to both sides.

As a final note: I started following the match thinking I am watching a competition of intelligence (loosely defined) between man and machine. What I ended up witnessing was incredible human drama, of Lee bearing incredible pressure, being hit hard repeatedly while the world is watching, sinking to the lowest of the lows, and soaring back up winning one game for the human race.. Just incredible up and down in a course of a week. Many of my friends were crying as the computer resigned.

Re: Lee Sedol Beats AlphaGo in Game 4

#167

Post by wdw129831 »

throw_xyz111 wrote: post #165
antonioalegria wrote: post #157

Earlier quoted context omitted.

A lot of comments here are unfounded. It was a thought I had that imo warrants some discussion (which you may disagree)

Agreed. 99% of the comments are just speculation - Yours is as good as any.

THIS MUST BE FLAGGED!!!!

Re: Lee Sedol Beats AlphaGo in Game 4

#170

Post by Queribus »

argonaut wrote: post #51

If it's true that AlphaGo started making a series of bad moves after its mistake on move 79, this might tie into a classic problem with agents trained using reinforcement learning, which is that after making an initial mistake (whether by accident or due to noise, etc.), the agent gets taken into a state it's not familiar with, so it makes another mistake, digging an even deeper hole for itself - the mistakes then co…

May well also depend to a not so "exact" forward pruning
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