Hello I'm using the CMU Face Images Data Set https://archive.ics.uci.edu/ml/datasets/CMU+Face+Images to build a model that allows me to recognize subjects who wear sunglasses, these images are in pgm format, I'm very new in machine learning and I do not know how to read the images in R. Does anyone know in what way I can do it? and if you have any recommendation for the construction of the model, I would appreciate it very much.