This AI project uses online videos as "a vast and untapped source of training data" to help systems learn how to perform tasks in Minecraft by watching and imitating human Minecraft players. It's interesting to see the parallel between machine learning and human learning, as this project depends in a way on a process of scaffolding to make the task achievable: "The team's approach, called Video Pre-Training (VPT), gets around the bottleneck in imitation learning by training another neural network to label videos automatically." (I can't tell any more whether MIT Technology Review is using paywalls, so if you hit one, please let me know).
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