Grab the goods and go. AiFi co-founder and CEO Steve Gu wants to give every store — from Mom and Pop bodegas to supermarket chains — the ability to let customers saunter out of the door without so much as a wave at a checker. The benefits involve more than just convenience: stores will have a better idea of how their customers behave and get a real-time bead on their inventory. To do that, our latest guests and his team at startup AiFi rely on advanced sensor fusion, simulation, and deep learning.