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$Q$-learning (and also its deep variant, and most of the other well-known reinforcement learning algorithms) are inherently learning approaches for single-agent environments. The entire problem setting that these algorithms are developed for (Markov decision processes, or MDPs) is always framed in terms of a single agent situated in some environment, where ...


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Deep Q Learning is a model-free algorithm. In the case of Go (and chess for that matter) the model of the game is very simple and deterministic. It's a perfect information game, so it's trivial to predict the next state given your current state and action (this is the model). They take advantage of this with MCTS to speed up training. I suppose Deep Q ...


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