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    <p>The problem you are pursuing is intractable in the way you have defined it. It is usually a mistake to think that a neural network would "magically" learn a rich reprsentation of a problem. A good fact to keep in mind when deciding whether ANN is the right tool for a task is that it is an interpolation method. Think, whether you can frame your problem as finding an approximation of a function, where you have many points from this function and lots of time for designing the network and training it.</p> <p>The problem you propose does not pass this test. Game control is not a function of the image on the screen. There is a lot of information the player has to keep in memory. For a simple example, it is often true that every time you enter a shop in a game, the screen looks the same. However, what you buy depends on the circumstances. No matter how complicated the network, if the screen pixels are its input, it would always perform the same action upon entering the store.</p> <p>Besides, there is the problem of scale. The task you propose is simply too complicated to learn in any reasonable amount of time. You should see <a href="http://aigamedev.com">aigamedev.com</a> for how game AI works. Artitificial Neural Networks have been used successfully in some games, but in very limited manner. Game AI is difficult and often expensive to develop. If there was a general approach of constructing functional neural networks, the industry would have most likely seized on it. I recommend that you begin with much, much simpler examples, like tic-tac-toe.</p>
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    1. POHow to train an artificial neural network to play Diablo 2 using visual input?
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    1. COFair enough. You could call most anything resembling a network an ANN, but it could hardly lead to a substantive discussion. :)
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    2. COHeh yeah... I should've explained my motivation in more depth. I know there are better ways to make game AIs, but I'm doing this to push the limits of the ANN simulator I've been upgrading. See: http://www.stanford.edu/group/pdplab/pdphandbook/
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    3. COIn any case, Don Reba is right, I too don't think it will be feasible to learn a strategy for something like Diablo without incorporating a lot of prior knowledge and extracting useful features that a reinforcement learning approach could be based upon. Just learning from the video input will be extremely hard if not impossible using today's computers.
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