Apple Inc. has lost at least four more of its artificial intelligence researchers in recent weeks in addition to a top Siri executive, with the staff headed to employers such as Meta Platforms Inc. and Google DeepMind.The latest exits include Yinfei Yang, Haoxuan You, Bailin Wang and Zirui Wang. Yang left to start a new company, while You and Bailin Wang joined Meta, according to people familiar with the matter. You left for that company’s Superintelligence research arm, and Bailin Wang is worki...