SAN JOSE — “I hope you realize this is not a concert,” said Nvidia President Jensen Huang to an audience so large, it filled up the SAP Center in San Jose. This is how he introduced what is perhaps the complete opposite of a concert: the company’s GTC event. “You have arrived at a developers conference. There will be a lot of science describing algorithms, computer architecture, mathematics. I sense a very heavy weight in the room; all of a sudden, you’re in the wrong place.”