Questions tagged [alphazero]

For questions related to DeepMind's AlphaZero, which is a computer program that can play Go, Chess, and Shogi. AlphaZero achieved, within 24 hours of training, a superhuman level of play in these three games by defeating world-champion programs Stockfish, Elmo, and the 3-day version of AlphaGo Zero. AlphaZero was introduced in "Mastering Chess and Shogi by Self-Play with a General Reinforcement Learning Algorithm" (2017) by David Silver et al.

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707 views

How does AlphaZero use its value and policy heads in conjunction?

I have a question about how the value and policy heads are used in AlphaZero (not Alphago Zero), and where the leaf nodes are relative to the root node. Specifically, there seem to be several possible ...
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3answers
1k views

Why were Chess experts surprised by the AlphaZero's victory against Stockfish?

It was recently brought to my attention that Chess experts took the outcome of this now famous match as something of an upset. See: Chess’s New Best Player Is A Fearless, Swashbuckling Algorithm ...
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3answers
974 views

Does Monte Carlo tree search qualify as machine learning?

To the best of my understanding, the Monte Carlo tree search (MCTS) algorithm is an alternative to minimax for searching a tree of nodes. It works by choosing a move (generally, the one with the ...
3
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1answer
105 views

How does the Alpha Zero's move encoding work?

I am a beginner in AI. I'm trying to train a multi-agent RL algorithm to play chess. One issue that I ran into was representing the action space (legal moves/or honestly just moves in general) ...
3
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1answer
75 views

AlphaGo Zero: does $Q(s_t, a)$ dominate $U(s_t, a)$ in difficult game states?

AlphaGo Zero AlphaGo Zero uses a Monte-Carlo Tree Search where the selection phase is governed by $\operatorname*{argmax}\limits_a\left( Q(s_t, a) + U(s_t, a) \right)$, where: the exploitation ...
2
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1answer
73 views

Clarifying representation of Neural Nerwork input for Chess Alpha Zero

In the Alpha Zero paper (https://arxiv.org/pdf/1712.01815.pdf) page 13, the input for the NN is described. In the beggining of the page, the authors state that: "The input to the Neural Network ...
1
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1answer
500 views

What was the average decision speed pf Alpha Zero in the recent Stockfish match?

The match got a lot of press, and I doubt anyone is surprised that Alpha Zero crushed Stockfish. See: AlphaZero Destroys Stockfish in 100 Game Match To me, what's really salient is that "much like ...