The Wolfram Neural Net repository offers ResNET-50, a very successful net to identify the main object in an image.

After downloading the net, I wanted to learn about the structure of the NetEncoder

NetExtract[pred, "Input"]

Mathematica tells us that the type is "Image" and the "Image Size" is 224x224.

I have two question related to this:

1. How is it possible that the net can be successfully applied to e.g. larger images of e.g. 250x250. I wonder that we do not get a warning?

Does this mean that the net automatically resizes the original image (e.g. from 250x250 pixels) to 224x224?

1. If one knows in advance that the images have image size, e.g. 500x500. Is it "easily" possible to change the hyperparameters of ResNet-50 for larger images?

Thank you for your time.