The AI revolution has not only sparked a sea change in several industries this year, but it has also more than tripled the Nvidia Corp. (NASDAQ:NVDA) stock in 2023. Yet, it remains the “cheapest AI play” right now, according to a Bernstein analyst. What Happened: Bernstein Research’s senior semiconductor analyst Stacy Rasgon thinks that Jensen Huang-led Nvidia is still a value purchase despite the massive rally this year. Powered by the AI revolution, Nvidia’s shares have surged over 241% in 2023 so far. Despite this, the company’s valuations are the cheapest they have been since the cryptocur…