AI is just getting started, and these companies are setting themselves up to benefit.Artificial intelligence (AI) has quickly become an investing theme for many people as they've experienced first-hand the benefits of using AI. But with an increasing number of tech companies betting on this new frontier, it can be hard to sift through the AI hype and find the companies that are actually worth investing in.Here are three AI stocks that are making a significant impact in the space and why they're worth buying ...