Nvidia is expected to deliver another blockbuster earnings report on Wednesday, but a shift in how artificial intelligence is used is raising doubts on how long its dominance in AI chips can last.After years of near-monopoly in chips used to train AI systems, Nvidia is facing competition from tech giants building their own chips to capture demand that is shifting toward processors that run AI systems, respond to queries and carry out tasks in real time.This so-called inference market is much larger, but also more contested.Traditional rivals Intel and AMD are pushing processors better suited for the smaller, cost-sensitive workloads…