NANJING - Right in the middle of the Yangtze River is an island the size of Pasir Ris, previously best known for its annual grape festival. But the vines and guest houses that used to dot Jiangxin Island – an islet 6.5km from downtown Nanjing that used to cater to day-trippers from central Nanjing – have largely been replaced by acres of manicured greenery and a clutch of buildings housing the artificial intelligence (AI) units of Chinese tech firms like Huawei, Tencent and iFlytek. Elsewhere across the island are incubators offering work spaces and collaborative opportunities for companies linked to...