GT Sophy (Part I). What is GT Sophy?

In Early February 2022, Sony's "first AI breakthrough", GT Sophy, made its appearance on the cover page of Nature magazine [2]. GT Sophy is a racing AI built to match with world-class level players in Gran Turismo Sport, the latest installation of the legendary game series on PlayStation 4. GT7 is famous for its extremely realistic simulation of real-life racing experience, which largely complicates the production of GT Sophy at the early stage. Every tiny decision that GT Sophy makes may change the result of the race entirely. Thus, there is little simplification can be done to the training process. Sony's AI team needs to take all possible factors, like drifting effects caused by the passage of nearby cars, to perform any estimation.