Apple Inc has hired a prominent artificial intelligence executive who recently left Google in a bid to boost its Siri voice assistant and other offerings powered by the technology. Apple confirmed that John Giannandrea, who previously served as Google's top artificial intelligence executive, will join the company later this month as its chief of machine learning and AI strategy, reporting to Chief Executive Tim Cook. The New York Times reported the move earlier. The hiring of Giannandrea is important because the Cupertino-based company is widely viewed as lagging its rivals in key areas of artificial intelligence. Though Siri made its debut in 2011 well before other voice assistants, Amazon.com