Hi, your work is so great!
There is a small problem here. I can't find TemporarilyAddMemory this file, but you used from optimizers.TemporarilyAddMemory import TemporarilyAddMemory in the 22nd line of the main.py file.
https://github.com/epfml/error-feedback-SGD/blob/master/main.py#L22
Have you forgotten to upload this file ?