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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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Is AlphaZero an example of an AGI?

From DeepMind's research paper on arxiv.org: In this paper, we apply a similar but fully generic algorithm, which we call AlphaZero, to the games of chess and shogi as well as Go, without any ...
Siddhartha's user avatar
1 vote
1 answer
2k 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 ...
aquaplane's user avatar
15 votes
3 answers
4k 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 ...
Inertial Ignorance's user avatar
11 votes
3 answers
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 ...
DukeZhou's user avatar
  • 6,237
7 votes
3 answers
350 views

Would AlphaGo Zero become perfect with enough training time?

Would AlphaGo Zero become theoretically perfect with enough training time? If not, what would be the limiting factor? (By perfect, I mean it always wins the game if possible, even against another ...
Christopher King's user avatar
6 votes
1 answer
2k 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) ...
Akshay Ghosh's user avatar
5 votes
1 answer
825 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 ...
Andrew's user avatar
  • 121
4 votes
1 answer
817 views

How does policy network learn in AlphaZero?

I'm currently trying to understand how AlphaZero works. There is one thing with the training of the AlphaZero's policy head that confuses me. Basically, in AlphaGo Zero's paper (where the major part ...
Alberto M's user avatar
3 votes
1 answer
251 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 ...
user3667125's user avatar
  • 1,600
2 votes
3 answers
452 views

Does AlphaGo play random moves in a real competition?

Alphago and AlphaGo zero use random play to generate data and use the data to train DNN. "Random play" means that there is a positive probability for AlphaGo to play some suboptimal moves ...
High GPA's user avatar
  • 163
1 vote
1 answer
417 views

What is a policy training target in AlphaZero?

In AlphaZero's attached pseudocode, they create a training target for the policy network in this way. ...
Druudik's user avatar
  • 149
1 vote
1 answer
766 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 ...
DukeZhou's user avatar
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