@JuanFMontesinos Thank you a ton! Didn’t expect to be spoon-fed the answer. Yes, I agree that 64x64 is much smaller, only reason I use it is because the entire dataset fits in my GPU’s RAM (about 10Gb). Using 224x224 makes it considerably slower because every mini-batch must be uploaded to fit.
@ptab Thanks for the suggestion. I am not doubting there might be benefits from doing that, but it seems to me like an overkill, what could it potentially offer? I can use RGB, but I’d rather stick to grayscale for now, however thanks again!