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Researchers struggle to build models that can generate a three-dimensional scene from a text prompt largely because they lack sufficient paired text-3D training examples. A new approach works without any 3D data whatsoever.

The long-dormant struggle to dominate the web-search business reignited in a display of AI-driven firepower — and hubris. Google and Microsoft announced competing upgrades powered by the latest generation of chatbots. Baidu, too, flexed its natural-language-processing muscles.