Nvidia Corp. announced a raft of projects aimed at bolstering artificial-intelligence infrastructure across Europe, including an expanded partnership with French startup Mistral AI.Chief Executive Officer Jensen Huang made the announcements during a joint Nvidia-VivaTech event in Paris, part of a globe-trotting campaign to promote the adoption of AI and his company’s products. A data center buildout is needed in Europe to help countries there catch up in deploying the technology, he said....