These are the four-propellor flying machines that utilize statistical learning techniques and artificial intelligence to fly autonomously.

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"From about 1990, a group in the U.S. came up with the idea of just treating it as a statistical problem -- more of a machine learning problem where you essentially ignore linguistics and just look for patterns in data, " he said.

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They grasped mathematical concepts quickly and understood English well, she said, but needed more help learning how to apply the concepts to real-world statistical gathering and analysis.

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