Fig. 3From: Creation of an artificial intelligence model for intubation difficulty classification by deep learning (convolutional neural network) using face images: an observational studyOverall view of AI model creation (author’s own). This figure shows the process of creating an AI model. To reduce the effect of data bias caused by randomly splitting the training data and test data, we split the training data from the test data by performing fivefold cross-validation and prepared five data setsBack to article page