A wave of companies, from the start-up launched by artificial intelligence “godmother” Li Fei-Fei to the largest Chinese tech firms, are racing to introduce their latest approaches to world models – an emerging field aimed at extending AI beyond language processing to learning from and comprehending physical reality. Alibaba Group Holding on Thursday unveiled Happy Oyster, which it called an open-ended world model designed for real-time and “flowy” virtual world creation and interaction,...