China is the land of facial recognition. Understanding how it made this technology flourish is instructive
land of face recognition. Cameras able to extract face prints from passers-by are common in the streets of large cities like Guangzhou and Shenzhen. Boxy vending machines at airports offer to let you pay for a cup of orange juice, robot-squeezed for perfect freshness, by scanning your face. From December 1st all people applying for an account with one of China’s telecoms companies such as China Mobile must have their face scanned.
To learn to differentiate between cats and dogs, a computer is first shown pictures in which each animal is correctly labelled. To learn to distinguish between one person’s face and another, a computer must first be shown what a face is, using labelled data, and then how to tell the difference between cheekbones and brows, again via human labelling. Only with enough labelled instructions will it be able to start recognising faces without human help.
Charles Liu is the founder of one of China’s largest data factories, known in English by the initialsHe employs 300,000 data labellers across China’s poorest provinces. Each labeller works a six-hour shift each day, tagging a stream of faces, medical imagery and cityscapes.pushes a stream of data to them as if on a digital conveyor belt, and they churn through it, creating the syllabus from which machines learn.
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