Imagine purchasing a robot to perform household tasks. This robot was built and trained in a factory on a certain set of tasks and has never seen the items in your home. When you ask it to pick up a mug from your kitchen table, it might not recognize your mug (perhaps because this mug is painted with an unusual image, say, of MIT's mascot, Tim the Beaver). So, the robot fails. "Right now, the way we train these robots, when they fail, we don't really know why. So you would just throw up your hands and say, 'OK, I guess we have to start over.

https://www.miragenews.com/new-method-speeds-up-robot-learning-1049070/

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