issue with pip, I think?

[yannseznec]

Hello! I'm trying to follow this and I'm running into an issue, I think it's maybe to do with pip? I get as far as running the bash install-stylegan2.sh command before things go wrong. When I run that command it installs loads of things and then starts giving me warnings like this:
INFO: pip is looking at multiple versions of six to determine which version is compatible with other requirements. This could take a while. INFO: pip is looking at multiple versions of requests to determine which version is compatible with other requireme nts. This could take a while. INFO: pip is looking at multiple versions of protobuf to determine which version is compatible with other requireme nts. This could take a while.
This is repeated for a number of other modules. Eventually it says:

ERROR: Cannot install -r requirements.txt (line 28) and Keras-Applications==1.0.7 because these package versions have conflicting dependencies.
The conflict is caused by:
    The user requested Keras-Applications==1.0.7
    tensorflow-gpu 1.15.0 depends on keras-applications>=1.0.8
To fix this you could try to:
1. loosen the range of package versions you've specified
2. remove package versions to allow pip attempt to solve the dependency conflict
ERROR: ResolutionImpossible: for help visit https://pip.pypa.io/en/latest/user_guide/#fixing-conflicting-dependencies

It then completes the installation and it all seems ok, but when I try to run the run_generator.py command it fails immediately, saying Traceback (most recent call last): File "run_generator.py", line 9, in <module> import PIL.Image ModuleNotFoundError: No module named 'PIL'

I think I've worked out that this means that pip has not managed to correctly install the various modules it needs to run this command...so I tried to install them myself. I started with keras-applications v1.0.8 and Pillow. That changed the error message to missing tensorflow, so I installed tensorflow 1.15. Then the error message said it was missing opensimplex, so I
installed that.

Once I had done all that I again ran the run_generator.py command, which generated a lot more activity but it eventually failed with the last line saying RuntimeError: No GPU devices found

I'm pretty clueless as to what has gone wrong. Is there some set of dependencies breaking somewhere? Or am I just doing something wildly wrong? It seems weird to me that all of those errors would then result in a "missing GPU device", so is that error completely unrelated to the previous errors?