Following the smart money in AI is a wise thing to do.Following the trades of billionaires is a smart investing strategy. While just thoughtlessly investing in the same stocks isn't a wise idea, it's good to see what trades they're making to ensure that you're not missing out on a megatrend. The biggest investment trend over the past few years has been artificial intelligence (AI), and billionaires are still piling money into this trend even after massive gains.One billionaire that I follow is David Tepper, ...