Fig. 8

Class activation heat map by Grad-CAM of easy group in supine-side-closed mouth-base position. The heat map shows the viewpoints when the AI classifies the author’s face image (not included in the dataset) as easy to intubate, and the average RGB value image of easy intubation in the data for inference evaluation. The viewpoints that are important for the prediction of easy intubation are red and yellow in the heat map