In a move that underscores ongoing challenges within Apple Inc.'s artificial intelligence division, Robby Walker, a senior executive overseeing key AI initiatives, is set to depart the company next month. Walker, who has been instrumental in shaping Apple's search and knowledge systems, including efforts tied to Siri, leaves amid a backdrop of delayed projects and talent attrition. According to reports from Bloomberg, his exit follows more than a decade at the tech giant, where he rose to prominence after Apple acquired his startup, Cue, in 2013.