Search found 6 matches

by ChessGo
Tue Oct 26, 2010 11:36 am
Forum: Computer Go
Topic: Monte Carlo (upper confidence bounds applied to trees)
Replies: 13
Views: 16409

Re: Monte Carlo (upper confidence bounds applied to trees)

To counter that problem the UCT score has two parts. One is the winning probability, and one represents the which decreases as the node gets explored. And this term causes unexplored nodes to played. I think there exists a prove that MCTS gives the same results as normal minimax search when the ...
by ChessGo
Mon Oct 25, 2010 11:50 pm
Forum: Computer Go
Topic: Monte Carlo (upper confidence bounds applied to trees)
Replies: 13
Views: 16409

Re: Monte Carlo (upper confidence bounds applied to trees)

What Li Kao said. The depth changes slowly: each simulation adds 1 node to the tree (usually). So if the tree looks like this:



Sorry, I'm still not sure that UCT works good.

For example, I have a position with two possible moves (a1 and b1):

O
/ \
(a1) (b1)

First random game (using a1 as ...
by ChessGo
Mon Oct 25, 2010 9:11 pm
Forum: Computer Go
Topic: Monte Carlo (upper confidence bounds applied to trees)
Replies: 13
Views: 16409

Re: Monte Carlo (upper confidence bounds applied to trees)

Why winrate takes into account only wins?

Code: Select all

winrate := Wins/Visits
What is better:

3 wins, 0 draws, 7 loses

or

2 wins, 6 draws, 2 loses

?
by ChessGo
Sat Oct 23, 2010 6:22 am
Forum: Computer Go
Topic: Monte Carlo (upper confidence bounds applied to trees)
Replies: 13
Views: 16409

Re: Monte Carlo (upper confidence bounds applied to trees)

The most comprehensive explanation is Sylvain Gelly's thesis, where he introduces it and explains how Mogo works:

http://www.lri.fr/~gelly/paper/SylvainGellyThesis.pdf

Thanks a lot!

The questions still remain. Am I correct thinking that the program creates a tree search (with which depth, by ...
by ChessGo
Sat Oct 23, 2010 6:19 am
Forum: Computer Go
Topic: Monte Carlo (upper confidence bounds applied to trees)
Replies: 13
Views: 16409

Re: Monte Carlo (upper confidence bounds applied to trees)


Those articles are a good starting point:
http://senseis.xmp.net/?UCT

Thank you. I didn't understand what author of the article (Magnus Persson?) wanted to say. It seems that English isn't his native language. Or I'm not a smart guy :roll:

The sum of the winrate and the number (UCTvalue) for ...
by ChessGo
Fri Oct 22, 2010 9:41 am
Forum: Computer Go
Topic: Monte Carlo (upper confidence bounds applied to trees)
Replies: 13
Views: 16409

Monte Carlo (upper confidence bounds applied to trees)

Hello all!
I would much appreciate if someone could explain me what exactly "upper confidence bounds applied to trees" is.

I added Monte Carlo to my engine, and now it plays even worse :(