In order for the onenn_baseline.py file to run I forked the package and changed the line above to:
from img2vec_pytorch import Img2Vec
I also downloaded img2vec using:
pip install img2vec_pytorch

I think img2vec directories were changed since the last modification of your file.

As a sidenote, I also had to upgrade pandas to 25.0 (from your suggestion of 24.1 in the txt file) for an error about StringIO import (on another file). I don't raise this sidenote as an issue, but I'm informing you about this, in case you get a similar error.

In most_similar in onenn_baseline (line 15) there is:

img2vec = Img2Vec(cuda=True)

Couldn't that be an argument so that systems without CUDA can also use this?