Heckerman and others have learned Bayesian networks that diagnose hundreds of infectious diseases in this way. Google uses a giant Bayesian network of this type in its AdSense system for automatically choosing ads to place on web pages. The network relates a million content variables to each other and to twelve million words and phrases via over three hundred million arrows, all learned from a hundred billion text snippets and search queries. On a lighter note, Microsoft’s Xbox Live uses a Bayesian network to rate players and match players of similar skill. The outcome of a game is a
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