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# Questions tagged [self-play]

For questions about the technique of "self play" in reinforcement learning in relation to combinatorial games and games in general.

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### Reproducing AlphaZero/MuZero: Failed to beat initial model in arena

I am trying to reproduce AlphaZero's algorithm on the board game Carcassonne. Since I want to use the final game score differences (i.e. victory point of player 1 - victory point of player 2) as the ...
27 views

### How to design a DQN that needs to self-play with very delayed rewards?

I got a single-player card game (comparable to BlackJack) in which rewards are VERY delayed. On average a player can estimate the effect of his move fifteen steps deep. As there are 52 cards to play ...
27 views

### Are there assumptions made about Self-Play that don't hold up in regular MA competition?

I read about this paper Efficient Competitive Self-Play Policy Optimization which proposes an algorithm for training a population of agents with self-play using a perturbation based matchmaking ...
210 views

### Given these two reward functions, what can we say about the optimal Q-values, in self-play tic-tac-toe?

This corresponds to Exercise 1.1 of Sutton & Barto's book (2nd edition), and a discussion followed from this answer. Consider the following two reward functions Win = +1, Draw = 0, Loss = -1 Win =...
3k views

### Why does self-playing tic-tac-toe not become perfect?

I trained a DQN that learns tic-tac-toe by playing against itself with a reward of -1/0/+1 for a loss/draw/win. Every 500 episodes, I test the progress by letting it play some episodes (also 500) ...
260 views

### Are multi agent or self-play environments always automatically POMDPs?

As part of my thesis, I'm working on a zero sum game with RL to train an agent. The game is a real-time game, a derivation of pong, one could imagine playing pong with both sides being foosball rods. ...
827 views

### How to fight with unstability in self play?

I'm working on a neural network that plays some board games like reversi or tic-tac-toe (zero-sum games, two players). I'm trying to have one network topology for all the games - I specifically don't ...
153 views

### In AlphaZero, which policy is saved in the dataset, and how is the move chosen?

I've been doing some research on the principles behind AlphaZero. Especially this cheat sheet (1) and this implementation (2) (in Connect 4) were very useful. Yet, I still have two important questions:...
242 views

### How does MuZero learn to play well for both sides of a two-player game?

I'm coding my own version of MuZero. However, I don't understand how it supposed to learn to play well for both players in a two-player game. Take Go for example. If I use a single MCTS to generate an ...
914 views

### How can both agents know the terminal reward in self-play reinforcement learning?

There seems to be a major difference in how the terminal reward is received/handled in self-play RL vs "normal" RL, which confuses me. I implemented TicTacToe the normal way, where a single ...
1 vote
83 views

### What does self-play in reinforcement learning lead to?

Suppose, instead of playing against a random opponent, the reinforcement learning algorithm described above played against itself, with both sides learning. What do you think would happen in this case?...
146 views

### Generalising performance of Q-learning agent through self-play in a two-player game (MCTS?)

I'm using Q-learning (off-policy TD-control as specified in Sutton's book on pg 131) to train an agent to play connect four. My goal is to create a strong player (superhuman performance?) purely by ...
320 views

### How to correctly implement self-play with DQN?

I have an environment where an agent faces an equal opponent, and while I've achieved OK performance implementing DQN and treating the opponent as a part of the environment, I think performance would ...
145 views

### How exactly does self-play work, and how does it relate to MCTS?

I am working towards using RL to create an AI for a two-player, hidden-information, a turn-based board game. I have just finished David Silver's RL course and Denny Britz's coding exercises, and so am ...