In Keras' documentation for the InceptionResNetV2 model, it says the following:
input_shape: (...). It should have exactly 3 inputs channels, and width and height should be no smaller than 139.
I'm trying to figure out the reason behind the minimum size of 139px for this model, because I'm looking to train this model on smaller images (128px for starters).
Assuming this number is not arbitrary, what is the reason behind this minimum size of 139px?