Apple’s lead artificial intelligence researcher for robotics has departed the company to join Meta Platforms’ competing effort, part of an exodus of AI talent from the iPhone maker. The employee, Zhang Jian, joined the Meta Robotics Studio, the social media company confirmed on Tuesday. Separately, three more AI researchers are leaving Apple’s in-house large language models team, adding to the upheaval in that group, according to people with knowledge of the matter. The latest string of...