Where Is the U.S. Beating China on A.I., and Where Is It Lagging?

As Xi Jinping visits President Trump in Washington, his country lags behind the United States on A.I. development in key areas — but Beijing has advantages elsewhere.The World Artificial Intelligence Conference in Shanghai in July. China and the United States are locked in an A.I. race that both sides see as decisive to gaining the upper hand militarily, technologically and economically.