Indian housewife Nagireddy Sriramyachandra wears a smartphone on her head as she records her actions through motion capture while slicing mangoes at her home in Chennai. Photo by AFP

Earning just over two dollars for an hour of video, her mundane recordings are invaluable for global tech companies teaching machines how to move like humans in the real world.

The 25-year-old is one of a growing army of thousands of AI system trainers in the world's most populous country.

"Who else will give you 250 rupees an hour just for doing housework?" said Sriramyachandra from her kitchen in Chennai in southern India's Tamil Nadu state.

"I may get a robot myself in the future," she added.