Snap Inc. Chief Executive Officer Evan Spiegel said he’s investing more aggressively in bringing artificial intelligence and machine learning to Snapchat to make it more interesting for its users, the next major shift after years spent overhauling its advertising business.“There was a recognition that we’d fallen behind the curve on the machine learning side, which, to some degree, was reflected in the business performance,” Spiegel said in an interview. “We needed to improve there and bring tog...